diff --git a/Documentation/docs/migration_guides/itk_6_migration_guide.md b/Documentation/docs/migration_guides/itk_6_migration_guide.md
index 334fe9cc59d9..369cbe5e7749 100644
--- a/Documentation/docs/migration_guides/itk_6_migration_guide.md
+++ b/Documentation/docs/migration_guides/itk_6_migration_guide.md
@@ -21,3 +21,11 @@ re-flagged as `ITK_LEGACY_REMOVE`. There have been some other
 deprecations and API changes. The new behavior is activated by setting
 `ITK_LEGACY_REMOVE` to `ON`. By default, compatibility with v5 is retained
 (`ITK_LEGACY_REMOVE=OFF`).
+
+
+Require modern C++ language feature use
+---------------------------------------
+
+Many backward compatible/ forward enabling compiler features are now required to be used.
+
+Replace `ITKv5_CONST` with `const`
diff --git a/Modules/Core/Common/include/itkImageSink.h b/Modules/Core/Common/include/itkImageSink.h
index d8c146c8b3da..ee14040534ec 100644
--- a/Modules/Core/Common/include/itkImageSink.h
+++ b/Modules/Core/Common/include/itkImageSink.h
@@ -158,7 +158,7 @@ class ImageSink
   {}
 
   void
-  VerifyInputInformation() ITKv5_CONST override;
+  VerifyInputInformation() const override;
 
   void
   BeforeStreamedGenerateData() override
diff --git a/Modules/Core/Common/include/itkImageSink.hxx b/Modules/Core/Common/include/itkImageSink.hxx
index 7966797b669f..ae34d2d914ef 100644
--- a/Modules/Core/Common/include/itkImageSink.hxx
+++ b/Modules/Core/Common/include/itkImageSink.hxx
@@ -167,7 +167,7 @@ ImageSink<TInputImage>::GenerateNthInputRequestedRegion(unsigned int inputReques
 
 template <typename TInputImage>
 void
-ImageSink<TInputImage>::VerifyInputInformation() ITKv5_CONST
+ImageSink<TInputImage>::VerifyInputInformation() const
 {
   using ImageBaseType = const ImageBase<InputImageDimension>;
 
diff --git a/Modules/Core/Common/include/itkImageToImageFilter.h b/Modules/Core/Common/include/itkImageToImageFilter.h
index f294f6b066f8..dd13b4277c1b 100644
--- a/Modules/Core/Common/include/itkImageToImageFilter.h
+++ b/Modules/Core/Common/include/itkImageToImageFilter.h
@@ -244,7 +244,7 @@ class ITK_TEMPLATE_EXPORT ImageToImageFilter
    * \sa ProcessObject::VerifyInputInformation
    */
   void
-  VerifyInputInformation() ITKv5_CONST override;
+  VerifyInputInformation() const override;
 
   /** What is the input requested region that is required to produce
    * the output requested region? The base assumption for image
diff --git a/Modules/Core/Common/include/itkImageToImageFilter.hxx b/Modules/Core/Common/include/itkImageToImageFilter.hxx
index c8ec806f39c1..d3ba255822f4 100644
--- a/Modules/Core/Common/include/itkImageToImageFilter.hxx
+++ b/Modules/Core/Common/include/itkImageToImageFilter.hxx
@@ -145,7 +145,7 @@ ImageToImageFilter<TInputImage, TOutputImage>::PrintSelf(std::ostream & os, Inde
 
 template <typename TInputImage, typename TOutputImage>
 void
-ImageToImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() ITKv5_CONST
+ImageToImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() const
 {
 
   using ImageBaseType = const ImageBase<InputImageDimension>;
diff --git a/Modules/Core/Common/include/itkMacro.h b/Modules/Core/Common/include/itkMacro.h
index 52691b52c531..da4ab71f0846 100644
--- a/Modules/Core/Common/include/itkMacro.h
+++ b/Modules/Core/Common/include/itkMacro.h
@@ -1373,11 +1373,11 @@ compilers.
 #  define ITK_ITERATOR_FINAL
 #endif
 
-#if defined(ITKV4_COMPATIBILITY)
-// A macro for methods which are const in ITKv5, but not in ITKv4
-#  define ITKv5_CONST
+#if defined(ITK_LEGACY_REMOVE)
+// A macro for methods which are const in ITKv5 and ITKv6 require const for functions
+#  define ITKv5_CONST static_assert(false, "ERROR: ITKv5_CONST must be replaced with 'const'")
 #else
-// A macro for methods which are const in ITKv5, but not in ITKv4
+// A macro for methods which are const in after ITKv4
 #  define ITKv5_CONST const
 #endif
 
diff --git a/Modules/Core/Common/include/itkProcessObject.h b/Modules/Core/Common/include/itkProcessObject.h
index 80f6630b2f95..509fc314a7b1 100644
--- a/Modules/Core/Common/include/itkProcessObject.h
+++ b/Modules/Core/Common/include/itkProcessObject.h
@@ -788,7 +788,7 @@ class ITKCommon_EXPORT ProcessObject : public Object
    *
    */
   virtual void
-  VerifyPreconditions() ITKv5_CONST;
+  VerifyPreconditions() const;
 
   /** \brief Verifies that the inputs meta-data is consistent and valid
    * for continued execution of the pipeline, throws an exception if
@@ -801,7 +801,7 @@ class ITKCommon_EXPORT ProcessObject : public Object
    *
    */
   virtual void
-  VerifyInputInformation() ITKv5_CONST;
+  VerifyInputInformation() const;
 
   /** What is the input requested region that is required to produce the
    * output requested region? By default, the largest possible region is
diff --git a/Modules/Core/Common/src/itkProcessObject.cxx b/Modules/Core/Common/src/itkProcessObject.cxx
index 27149b018a79..42fe97c8f067 100644
--- a/Modules/Core/Common/src/itkProcessObject.cxx
+++ b/Modules/Core/Common/src/itkProcessObject.cxx
@@ -1327,7 +1327,7 @@ ProcessObject::PropagateResetPipeline()
 
 
 void
-ProcessObject::VerifyPreconditions() ITKv5_CONST
+ProcessObject::VerifyPreconditions() const
 {
   /**
    * Make sure that all the required named inputs are there and non null
@@ -1356,7 +1356,7 @@ ProcessObject::VerifyPreconditions() ITKv5_CONST
 
 
 void
-ProcessObject::VerifyInputInformation() ITKv5_CONST
+ProcessObject::VerifyInputInformation() const
 {}
 
 
diff --git a/Modules/Core/TestKernel/include/itkTestingComparisonImageFilter.h b/Modules/Core/TestKernel/include/itkTestingComparisonImageFilter.h
index 00470a1ae273..8c1e550386b7 100644
--- a/Modules/Core/TestKernel/include/itkTestingComparisonImageFilter.h
+++ b/Modules/Core/TestKernel/include/itkTestingComparisonImageFilter.h
@@ -135,7 +135,7 @@ class ITK_TEMPLATE_EXPORT ComparisonImageFilter : public ImageToImageFilter<TInp
   AfterThreadedGenerateData() override;
 
   void
-  VerifyInputInformation() ITKv5_CONST override;
+  VerifyInputInformation() const override;
 
   OutputPixelType m_DifferenceThreshold{};
 
diff --git a/Modules/Core/TestKernel/include/itkTestingComparisonImageFilter.hxx b/Modules/Core/TestKernel/include/itkTestingComparisonImageFilter.hxx
index 4b2b44ee2a60..a93af7d24703 100644
--- a/Modules/Core/TestKernel/include/itkTestingComparisonImageFilter.hxx
+++ b/Modules/Core/TestKernel/include/itkTestingComparisonImageFilter.hxx
@@ -265,7 +265,7 @@ ComparisonImageFilter<TInputImage, TOutputImage>::AfterThreadedGenerateData()
 
 template <typename TInputImage, typename TOutputImage>
 void
-ComparisonImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() ITKv5_CONST
+ComparisonImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() const
 {
   if (m_VerifyInputInformation)
   {
diff --git a/Modules/Core/Transform/include/itkTransformGeometryImageFilter.h b/Modules/Core/Transform/include/itkTransformGeometryImageFilter.h
index f174a3cb5ff7..eb4b3737acb9 100644
--- a/Modules/Core/Transform/include/itkTransformGeometryImageFilter.h
+++ b/Modules/Core/Transform/include/itkTransformGeometryImageFilter.h
@@ -155,7 +155,7 @@ class ITK_TEMPLATE_EXPORT TransformGeometryImageFilter : public InPlaceImageFilt
   GenerateOutputInformation() override;
 
   void
-  VerifyPreconditions() ITKv5_CONST override;
+  VerifyPreconditions() const override;
 
   void
   GenerateData() override;
diff --git a/Modules/Core/Transform/include/itkTransformGeometryImageFilter.hxx b/Modules/Core/Transform/include/itkTransformGeometryImageFilter.hxx
index 75d73d63f30f..924060ff7d42 100644
--- a/Modules/Core/Transform/include/itkTransformGeometryImageFilter.hxx
+++ b/Modules/Core/Transform/include/itkTransformGeometryImageFilter.hxx
@@ -36,7 +36,7 @@ TransformGeometryImageFilter<TInputImage, TOutputImage>::TransformGeometryImageF
 
 template <typename TInputImage, typename TOutputImage>
 void
-TransformGeometryImageFilter<TInputImage, TOutputImage>::VerifyPreconditions() ITKv5_CONST
+TransformGeometryImageFilter<TInputImage, TOutputImage>::VerifyPreconditions() const
 {
   Superclass::VerifyPreconditions();
 
diff --git a/Modules/Filtering/Convolution/include/itkConvolutionImageFilterBase.h b/Modules/Filtering/Convolution/include/itkConvolutionImageFilterBase.h
index 9ffdb5e605a3..4b5379d6b122 100644
--- a/Modules/Filtering/Convolution/include/itkConvolutionImageFilterBase.h
+++ b/Modules/Filtering/Convolution/include/itkConvolutionImageFilterBase.h
@@ -154,7 +154,7 @@ class ITK_TEMPLATE_EXPORT ConvolutionImageFilterBase : public ImageToImageFilter
   /** Default superclass implementation ensures that input images
    * occupy same physical space. This is not needed for this filter. */
   void
-  VerifyInputInformation() ITKv5_CONST override{};
+  VerifyInputInformation() const override{};
 
 private:
   bool m_Normalize{ false };
diff --git a/Modules/Filtering/Convolution/include/itkMaskedFFTNormalizedCorrelationImageFilter.h b/Modules/Filtering/Convolution/include/itkMaskedFFTNormalizedCorrelationImageFilter.h
index a52a73c4330e..a46d23f7ccd8 100644
--- a/Modules/Filtering/Convolution/include/itkMaskedFFTNormalizedCorrelationImageFilter.h
+++ b/Modules/Filtering/Convolution/include/itkMaskedFFTNormalizedCorrelationImageFilter.h
@@ -248,7 +248,7 @@ class ITK_TEMPLATE_EXPORT MaskedFFTNormalizedCorrelationImageFilter
 
   /** Overlap the VerifyInputInformation method */
   void
-  VerifyInputInformation() ITKv5_CONST override;
+  VerifyInputInformation() const override;
 
   /** Standard pipeline method.*/
   void
diff --git a/Modules/Filtering/Convolution/include/itkMaskedFFTNormalizedCorrelationImageFilter.hxx b/Modules/Filtering/Convolution/include/itkMaskedFFTNormalizedCorrelationImageFilter.hxx
index d084069d2f74..231a8cf0d0fc 100644
--- a/Modules/Filtering/Convolution/include/itkMaskedFFTNormalizedCorrelationImageFilter.hxx
+++ b/Modules/Filtering/Convolution/include/itkMaskedFFTNormalizedCorrelationImageFilter.hxx
@@ -600,7 +600,7 @@ MaskedFFTNormalizedCorrelationImageFilter<TInputImage, TOutputImage, TMaskImage>
 
 template <typename TInputImage, typename TOutputImage, typename TMaskImage>
 void
-MaskedFFTNormalizedCorrelationImageFilter<TInputImage, TOutputImage, TMaskImage>::VerifyInputInformation() ITKv5_CONST
+MaskedFFTNormalizedCorrelationImageFilter<TInputImage, TOutputImage, TMaskImage>::VerifyInputInformation() const
 {
   // Call the superclass' implementation of this method.
   Superclass::VerifyInputInformation();
diff --git a/Modules/Filtering/DiffusionTensorImage/include/itkDiffusionTensor3DReconstructionImageFilter.h b/Modules/Filtering/DiffusionTensorImage/include/itkDiffusionTensor3DReconstructionImageFilter.h
index 5f1ebde8e1bf..dd03036153b1 100644
--- a/Modules/Filtering/DiffusionTensorImage/include/itkDiffusionTensor3DReconstructionImageFilter.h
+++ b/Modules/Filtering/DiffusionTensorImage/include/itkDiffusionTensor3DReconstructionImageFilter.h
@@ -312,7 +312,7 @@ class ITK_TEMPLATE_EXPORT DiffusionTensor3DReconstructionImageFilter
   DynamicThreadedGenerateData(const OutputImageRegionType & outputRegionForThread) override;
 
   void
-  VerifyPreconditions() ITKv5_CONST override;
+  VerifyPreconditions() const override;
 
   /** Enables backwards compatibility for enum values */
   using GradientImageTypeEnumeration = DiffusionTensor3DReconstructionImageFilterEnums::GradientImageFormat;
diff --git a/Modules/Filtering/DiffusionTensorImage/include/itkDiffusionTensor3DReconstructionImageFilter.hxx b/Modules/Filtering/DiffusionTensorImage/include/itkDiffusionTensor3DReconstructionImageFilter.hxx
index 57d5cc733660..fcdb7d17a170 100644
--- a/Modules/Filtering/DiffusionTensorImage/include/itkDiffusionTensor3DReconstructionImageFilter.hxx
+++ b/Modules/Filtering/DiffusionTensorImage/include/itkDiffusionTensor3DReconstructionImageFilter.hxx
@@ -642,7 +642,7 @@ void
 DiffusionTensor3DReconstructionImageFilter<TReferenceImagePixelType,
                                            TGradientImagePixelType,
                                            TTensorPixelType,
-                                           TMaskImageType>::VerifyPreconditions() ITKv5_CONST
+                                           TMaskImageType>::VerifyPreconditions() const
 {
   Superclass::VerifyPreconditions();
 
diff --git a/Modules/Filtering/FastMarching/include/itkFastMarchingUpwindGradientImageFilter.h b/Modules/Filtering/FastMarching/include/itkFastMarchingUpwindGradientImageFilter.h
index f479b88b8b2b..c9c7a1b1e367 100644
--- a/Modules/Filtering/FastMarching/include/itkFastMarchingUpwindGradientImageFilter.h
+++ b/Modules/Filtering/FastMarching/include/itkFastMarchingUpwindGradientImageFilter.h
@@ -246,7 +246,7 @@ class ITK_TEMPLATE_EXPORT FastMarchingUpwindGradientImageFilter : public FastMar
   PrintSelf(std::ostream & os, Indent indent) const override;
 
   virtual void
-  VerifyPreconditions() ITKv5_CONST override;
+  VerifyPreconditions() const override;
 
   void
   Initialize(LevelSetImageType *) override;
diff --git a/Modules/Filtering/FastMarching/include/itkFastMarchingUpwindGradientImageFilter.hxx b/Modules/Filtering/FastMarching/include/itkFastMarchingUpwindGradientImageFilter.hxx
index efedce1475e5..4dda3e042ca5 100644
--- a/Modules/Filtering/FastMarching/include/itkFastMarchingUpwindGradientImageFilter.hxx
+++ b/Modules/Filtering/FastMarching/include/itkFastMarchingUpwindGradientImageFilter.hxx
@@ -60,7 +60,7 @@ FastMarchingUpwindGradientImageFilter<TLevelSet, TSpeedImage>::PrintSelf(std::os
 
 template <typename TLevelSet, typename TSpeedImage>
 void
-FastMarchingUpwindGradientImageFilter<TLevelSet, TSpeedImage>::VerifyPreconditions() ITKv5_CONST
+FastMarchingUpwindGradientImageFilter<TLevelSet, TSpeedImage>::VerifyPreconditions() const
 {
   Superclass::VerifyPreconditions();
 
diff --git a/Modules/Filtering/ImageCompose/include/itkJoinSeriesImageFilter.h b/Modules/Filtering/ImageCompose/include/itkJoinSeriesImageFilter.h
index 81f14031349b..555d3a57a158 100644
--- a/Modules/Filtering/ImageCompose/include/itkJoinSeriesImageFilter.h
+++ b/Modules/Filtering/ImageCompose/include/itkJoinSeriesImageFilter.h
@@ -104,7 +104,7 @@ class ITK_TEMPLATE_EXPORT JoinSeriesImageFilter : public ImageToImageFilter<TInp
    * \sa ProcessObject::VerifyInputInformation
    */
   void
-  VerifyInputInformation() ITKv5_CONST override;
+  VerifyInputInformation() const override;
 
   /** Overrides GenerateOutputInformation() in order to produce
    * an image which has a different information than the first input.
diff --git a/Modules/Filtering/ImageCompose/include/itkJoinSeriesImageFilter.hxx b/Modules/Filtering/ImageCompose/include/itkJoinSeriesImageFilter.hxx
index ceb4afc02bfc..cb6c16237ddc 100644
--- a/Modules/Filtering/ImageCompose/include/itkJoinSeriesImageFilter.hxx
+++ b/Modules/Filtering/ImageCompose/include/itkJoinSeriesImageFilter.hxx
@@ -34,7 +34,7 @@ JoinSeriesImageFilter<TInputImage, TOutputImage>::JoinSeriesImageFilter()
 
 template <typename TInputImage, typename TOutputImage>
 void
-JoinSeriesImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() ITKv5_CONST
+JoinSeriesImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() const
 {
 
   Superclass::VerifyInputInformation();
diff --git a/Modules/Filtering/ImageFeature/include/itkHessianToObjectnessMeasureImageFilter.h b/Modules/Filtering/ImageFeature/include/itkHessianToObjectnessMeasureImageFilter.h
index 2f1e6a2719ed..7657a368c873 100644
--- a/Modules/Filtering/ImageFeature/include/itkHessianToObjectnessMeasureImageFilter.h
+++ b/Modules/Filtering/ImageFeature/include/itkHessianToObjectnessMeasureImageFilter.h
@@ -135,7 +135,7 @@ class ITK_TEMPLATE_EXPORT HessianToObjectnessMeasureImageFilter : public ImageTo
   PrintSelf(std::ostream & os, Indent indent) const override;
 
   void
-  VerifyPreconditions() ITKv5_CONST override;
+  VerifyPreconditions() const override;
 
   void
   DynamicThreadedGenerateData(const OutputImageRegionType & outputRegionForThread) override;
diff --git a/Modules/Filtering/ImageFeature/include/itkHessianToObjectnessMeasureImageFilter.hxx b/Modules/Filtering/ImageFeature/include/itkHessianToObjectnessMeasureImageFilter.hxx
index 79fdd2016369..bd0a8f3b601b 100644
--- a/Modules/Filtering/ImageFeature/include/itkHessianToObjectnessMeasureImageFilter.hxx
+++ b/Modules/Filtering/ImageFeature/include/itkHessianToObjectnessMeasureImageFilter.hxx
@@ -40,7 +40,7 @@ HessianToObjectnessMeasureImageFilter<TInputImage, TOutputImage>::HessianToObjec
 
 template <typename TInputImage, typename TOutputImage>
 void
-HessianToObjectnessMeasureImageFilter<TInputImage, TOutputImage>::VerifyPreconditions() ITKv5_CONST
+HessianToObjectnessMeasureImageFilter<TInputImage, TOutputImage>::VerifyPreconditions() const
 {
   Superclass::VerifyPreconditions();
   if (m_ObjectDimension >= ImageDimension)
diff --git a/Modules/Filtering/ImageFeature/include/itkHoughTransform2DCirclesImageFilter.h b/Modules/Filtering/ImageFeature/include/itkHoughTransform2DCirclesImageFilter.h
index cfb977cc8831..f12682fa9aa3 100644
--- a/Modules/Filtering/ImageFeature/include/itkHoughTransform2DCirclesImageFilter.h
+++ b/Modules/Filtering/ImageFeature/include/itkHoughTransform2DCirclesImageFilter.h
@@ -107,7 +107,7 @@ class ITK_TEMPLATE_EXPORT HoughTransform2DCirclesImageFilter
 
   /** Verifies the preconditions of this filter. */
   void
-  VerifyPreconditions() ITKv5_CONST override;
+  VerifyPreconditions() const override;
 
   /** Method for evaluating the implicit function over the image. */
   void
diff --git a/Modules/Filtering/ImageFeature/include/itkHoughTransform2DCirclesImageFilter.hxx b/Modules/Filtering/ImageFeature/include/itkHoughTransform2DCirclesImageFilter.hxx
index 482614b1f3ac..dcd9e59974fe 100644
--- a/Modules/Filtering/ImageFeature/include/itkHoughTransform2DCirclesImageFilter.hxx
+++ b/Modules/Filtering/ImageFeature/include/itkHoughTransform2DCirclesImageFilter.hxx
@@ -65,8 +65,7 @@ HoughTransform2DCirclesImageFilter<TInputPixelType, TOutputPixelType, TRadiusPix
 
 template <typename TInputPixelType, typename TOutputPixelType, typename TRadiusPixelType>
 void
-HoughTransform2DCirclesImageFilter<TInputPixelType, TOutputPixelType, TRadiusPixelType>::VerifyPreconditions()
-  ITKv5_CONST
+HoughTransform2DCirclesImageFilter<TInputPixelType, TOutputPixelType, TRadiusPixelType>::VerifyPreconditions() const
 {
   Superclass::VerifyPreconditions();
 
diff --git a/Modules/Filtering/ImageFeature/include/itkUnsharpMaskImageFilter.h b/Modules/Filtering/ImageFeature/include/itkUnsharpMaskImageFilter.h
index d881459b699c..1114af87ed2b 100644
--- a/Modules/Filtering/ImageFeature/include/itkUnsharpMaskImageFilter.h
+++ b/Modules/Filtering/ImageFeature/include/itkUnsharpMaskImageFilter.h
@@ -155,7 +155,7 @@ class ITK_TEMPLATE_EXPORT UnsharpMaskImageFilter : public ImageToImageFilter<TIn
   GenerateInputRequestedRegion() override;
 
   void
-  VerifyPreconditions() ITKv5_CONST override;
+  VerifyPreconditions() const override;
   void
   GenerateData() override;
 
diff --git a/Modules/Filtering/ImageFeature/include/itkUnsharpMaskImageFilter.hxx b/Modules/Filtering/ImageFeature/include/itkUnsharpMaskImageFilter.hxx
index 44690d79fa97..e85bd52a6908 100644
--- a/Modules/Filtering/ImageFeature/include/itkUnsharpMaskImageFilter.hxx
+++ b/Modules/Filtering/ImageFeature/include/itkUnsharpMaskImageFilter.hxx
@@ -56,7 +56,7 @@ UnsharpMaskImageFilter<TInputImage, TOutputImage, TInternalPrecision>::GenerateI
 
 template <typename TInputImage, typename TOutputImage, typename TInternalPrecision>
 void
-UnsharpMaskImageFilter<TInputImage, TOutputImage, TInternalPrecision>::VerifyPreconditions() ITKv5_CONST
+UnsharpMaskImageFilter<TInputImage, TOutputImage, TInternalPrecision>::VerifyPreconditions() const
 {
   Superclass::VerifyPreconditions();
   if (m_Threshold < 0.0)
diff --git a/Modules/Filtering/ImageFrequency/include/itkFrequencyBandImageFilter.h b/Modules/Filtering/ImageFrequency/include/itkFrequencyBandImageFilter.h
index 09cd6e1c7a79..310d12d48ab5 100644
--- a/Modules/Filtering/ImageFrequency/include/itkFrequencyBandImageFilter.h
+++ b/Modules/Filtering/ImageFrequency/include/itkFrequencyBandImageFilter.h
@@ -188,7 +188,7 @@ class ITK_TEMPLATE_EXPORT FrequencyBandImageFilter : public UnaryFrequencyDomain
 
   /* Checks the logic of FrequencyThresholds. */
   void
-  VerifyPreconditions() ITKv5_CONST override;
+  VerifyPreconditions() const override;
 
   /* This is the box functor, which implements the filter's behavior. */
   void
diff --git a/Modules/Filtering/ImageFrequency/include/itkFrequencyBandImageFilter.hxx b/Modules/Filtering/ImageFrequency/include/itkFrequencyBandImageFilter.hxx
index 5035c4b16970..19c8814a0cc7 100644
--- a/Modules/Filtering/ImageFrequency/include/itkFrequencyBandImageFilter.hxx
+++ b/Modules/Filtering/ImageFrequency/include/itkFrequencyBandImageFilter.hxx
@@ -111,7 +111,7 @@ FrequencyBandImageFilter<TImageType, TFrequencyIterator>::SetFrequencyThresholds
 
 template <typename TImageType, typename TFrequencyIterator>
 void
-FrequencyBandImageFilter<TImageType, TFrequencyIterator>::VerifyPreconditions() ITKv5_CONST
+FrequencyBandImageFilter<TImageType, TFrequencyIterator>::VerifyPreconditions() const
 {
   this->Superclass::VerifyPreconditions();
 
diff --git a/Modules/Filtering/ImageGrid/include/itkChangeInformationImageFilter.h b/Modules/Filtering/ImageGrid/include/itkChangeInformationImageFilter.h
index 55b9e6f0a630..6cf0eee6b34c 100644
--- a/Modules/Filtering/ImageGrid/include/itkChangeInformationImageFilter.h
+++ b/Modules/Filtering/ImageGrid/include/itkChangeInformationImageFilter.h
@@ -235,7 +235,7 @@ class ITK_TEMPLATE_EXPORT ChangeInformationImageFilter : public ImageToImageFilt
    * \sa ProcessObject::VerifyInputInformation
    */
   void
-  VerifyInputInformation() ITKv5_CONST override
+  VerifyInputInformation() const override
   {}
 
 private:
diff --git a/Modules/Filtering/ImageGrid/include/itkCropImageFilter.h b/Modules/Filtering/ImageGrid/include/itkCropImageFilter.h
index a803fc8b6a21..cb86641a72bc 100644
--- a/Modules/Filtering/ImageGrid/include/itkCropImageFilter.h
+++ b/Modules/Filtering/ImageGrid/include/itkCropImageFilter.h
@@ -113,7 +113,7 @@ class ITK_TEMPLATE_EXPORT CropImageFilter : public ExtractImageFilter<TInputImag
   GenerateOutputInformation() override;
 
   void
-  VerifyInputInformation() ITKv5_CONST override;
+  VerifyInputInformation() const override;
 
 private:
   SizeType m_UpperBoundaryCropSize{};
diff --git a/Modules/Filtering/ImageGrid/include/itkCropImageFilter.hxx b/Modules/Filtering/ImageGrid/include/itkCropImageFilter.hxx
index b9dfb9a91416..7f43618d5337 100644
--- a/Modules/Filtering/ImageGrid/include/itkCropImageFilter.hxx
+++ b/Modules/Filtering/ImageGrid/include/itkCropImageFilter.hxx
@@ -58,7 +58,7 @@ CropImageFilter<TInputImage, TOutputImage>::GenerateOutputInformation()
 
 template <typename TInputImage, typename TOutputImage>
 void
-CropImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() ITKv5_CONST
+CropImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() const
 {
   Superclass::VerifyInputInformation();
 
diff --git a/Modules/Filtering/ImageGrid/include/itkInterpolateImagePointsFilter.h b/Modules/Filtering/ImageGrid/include/itkInterpolateImagePointsFilter.h
index 5f2756f262aa..db4700819b3f 100644
--- a/Modules/Filtering/ImageGrid/include/itkInterpolateImagePointsFilter.h
+++ b/Modules/Filtering/ImageGrid/include/itkInterpolateImagePointsFilter.h
@@ -179,7 +179,7 @@ class ITK_TEMPLATE_EXPORT InterpolateImagePointsFilter : public ImageToImageFilt
    * \sa ProcessObject::VerifyInputInformation
    */
   void
-  VerifyInputInformation() ITKv5_CONST override
+  VerifyInputInformation() const override
   {}
 
 private:
diff --git a/Modules/Filtering/ImageGrid/include/itkPasteImageFilter.h b/Modules/Filtering/ImageGrid/include/itkPasteImageFilter.h
index f66d9d79833b..451d2148bd0c 100644
--- a/Modules/Filtering/ImageGrid/include/itkPasteImageFilter.h
+++ b/Modules/Filtering/ImageGrid/include/itkPasteImageFilter.h
@@ -167,11 +167,11 @@ class ITK_TEMPLATE_EXPORT PasteImageFilter : public InPlaceImageFilter<TInputIma
    * \sa ProcessObject::VerifyInputInformation
    */
   void
-  VerifyInputInformation() ITKv5_CONST override
+  VerifyInputInformation() const override
   {}
 
   void
-  VerifyPreconditions() ITKv5_CONST override;
+  VerifyPreconditions() const override;
 
   bool
   CanRunInPlace() const override;
diff --git a/Modules/Filtering/ImageGrid/include/itkPasteImageFilter.hxx b/Modules/Filtering/ImageGrid/include/itkPasteImageFilter.hxx
index 96fbe3c82b3b..f142f2f613a0 100644
--- a/Modules/Filtering/ImageGrid/include/itkPasteImageFilter.hxx
+++ b/Modules/Filtering/ImageGrid/include/itkPasteImageFilter.hxx
@@ -78,7 +78,7 @@ PasteImageFilter<TInputImage, TSourceImage, TOutputImage>::GenerateInputRequeste
 
 template <typename TInputImage, typename TSourceImage, typename TOutputImage>
 void
-PasteImageFilter<TInputImage, TSourceImage, TOutputImage>::VerifyPreconditions() ITKv5_CONST
+PasteImageFilter<TInputImage, TSourceImage, TOutputImage>::VerifyPreconditions() const
 {
   Superclass::VerifyPreconditions();
 
diff --git a/Modules/Filtering/ImageGrid/include/itkResampleImageFilter.h b/Modules/Filtering/ImageGrid/include/itkResampleImageFilter.h
index 6b17b7b59b6d..f5707978a84d 100644
--- a/Modules/Filtering/ImageGrid/include/itkResampleImageFilter.h
+++ b/Modules/Filtering/ImageGrid/include/itkResampleImageFilter.h
@@ -185,7 +185,7 @@ class ITK_TEMPLATE_EXPORT ResampleImageFilter : public ImageToImageFilter<TInput
   /* See superclass for doxygen. This method adds the additional check
    * that the output space is set */
   void
-  VerifyPreconditions() ITKv5_CONST override;
+  VerifyPreconditions() const override;
 
   /** Get/Set the coordinate transformation.
    * Set the coordinate transform to use for resampling.  Note that this must
@@ -288,7 +288,7 @@ class ITK_TEMPLATE_EXPORT ResampleImageFilter : public ImageToImageFilter<TInput
    * \sa ProcessObject::VerifyInputInformation
    */
   void
-  VerifyInputInformation() ITKv5_CONST override
+  VerifyInputInformation() const override
   {}
 
   /** ResampleImageFilter produces an image which is a different size
diff --git a/Modules/Filtering/ImageGrid/include/itkResampleImageFilter.hxx b/Modules/Filtering/ImageGrid/include/itkResampleImageFilter.hxx
index d38942210c15..1c50e46856f9 100644
--- a/Modules/Filtering/ImageGrid/include/itkResampleImageFilter.hxx
+++ b/Modules/Filtering/ImageGrid/include/itkResampleImageFilter.hxx
@@ -102,7 +102,7 @@ template <typename TInputImage,
           typename TTransformPrecisionType>
 void
 ResampleImageFilter<TInputImage, TOutputImage, TInterpolatorPrecisionType, TTransformPrecisionType>::
-  VerifyPreconditions() ITKv5_CONST
+  VerifyPreconditions() const
 {
   this->Superclass::VerifyPreconditions();
   const ReferenceImageBaseType * const referenceImage = this->GetReferenceImage();
diff --git a/Modules/Filtering/ImageGrid/include/itkSliceBySliceImageFilter.h b/Modules/Filtering/ImageGrid/include/itkSliceBySliceImageFilter.h
index 69e522610fec..9ad88c761462 100644
--- a/Modules/Filtering/ImageGrid/include/itkSliceBySliceImageFilter.h
+++ b/Modules/Filtering/ImageGrid/include/itkSliceBySliceImageFilter.h
@@ -166,7 +166,7 @@ class ITK_TEMPLATE_EXPORT SliceBySliceImageFilter : public ImageToImageFilter<TI
   ~SliceBySliceImageFilter() override = default;
 
   void
-  VerifyInputInformation() ITKv5_CONST override;
+  VerifyInputInformation() const override;
 
   void
   GenerateData() override;
diff --git a/Modules/Filtering/ImageGrid/include/itkSliceBySliceImageFilter.hxx b/Modules/Filtering/ImageGrid/include/itkSliceBySliceImageFilter.hxx
index 28807410136c..a1d3942cafa1 100644
--- a/Modules/Filtering/ImageGrid/include/itkSliceBySliceImageFilter.hxx
+++ b/Modules/Filtering/ImageGrid/include/itkSliceBySliceImageFilter.hxx
@@ -54,7 +54,7 @@ SliceBySliceImageFilter<TInputImage,
                         TInputFilter,
                         TOutputFilter,
                         TInternalInputImageType,
-                        TInternalOutputImageType>::VerifyInputInformation() ITKv5_CONST
+                        TInternalOutputImageType>::VerifyInputInformation() const
 {
 
   Superclass::VerifyInputInformation();
diff --git a/Modules/Filtering/ImageGrid/include/itkSliceImageFilter.h b/Modules/Filtering/ImageGrid/include/itkSliceImageFilter.h
index 9b5be1a2ada5..72011c4f2d76 100644
--- a/Modules/Filtering/ImageGrid/include/itkSliceImageFilter.h
+++ b/Modules/Filtering/ImageGrid/include/itkSliceImageFilter.h
@@ -154,7 +154,7 @@ class ITK_TEMPLATE_EXPORT SliceImageFilter : public ImageToImageFilter<TInputIma
 
 
   void
-  VerifyInputInformation() ITKv5_CONST override;
+  VerifyInputInformation() const override;
 
 private:
   IndexType m_Start{};
diff --git a/Modules/Filtering/ImageGrid/include/itkSliceImageFilter.hxx b/Modules/Filtering/ImageGrid/include/itkSliceImageFilter.hxx
index 7a0ea41adac3..8a1e9dd1df98 100644
--- a/Modules/Filtering/ImageGrid/include/itkSliceImageFilter.hxx
+++ b/Modules/Filtering/ImageGrid/include/itkSliceImageFilter.hxx
@@ -302,7 +302,7 @@ SliceImageFilter<TInputImage, TOutputImage>::GenerateOutputInformation()
 
 template <class TInputImage, class TOutputImage>
 void
-SliceImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() ITKv5_CONST
+SliceImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() const
 {
 
   Superclass::VerifyInputInformation();
diff --git a/Modules/Filtering/ImageGrid/include/itkTileImageFilter.h b/Modules/Filtering/ImageGrid/include/itkTileImageFilter.h
index f9b3074a03f5..544aa347bd55 100644
--- a/Modules/Filtering/ImageGrid/include/itkTileImageFilter.h
+++ b/Modules/Filtering/ImageGrid/include/itkTileImageFilter.h
@@ -148,7 +148,7 @@ class ITK_TEMPLATE_EXPORT TileImageFilter : public ImageToImageFilter<TInputImag
    * \sa ProcessObject::VerifyInputInformation
    */
   void
-  VerifyInputInformation() ITKv5_CONST override;
+  VerifyInputInformation() const override;
 
 private:
   typename TileImageType::Pointer m_TileImage{};
diff --git a/Modules/Filtering/ImageGrid/include/itkTileImageFilter.hxx b/Modules/Filtering/ImageGrid/include/itkTileImageFilter.hxx
index fd092d019f4e..41f3a8cce025 100644
--- a/Modules/Filtering/ImageGrid/include/itkTileImageFilter.hxx
+++ b/Modules/Filtering/ImageGrid/include/itkTileImageFilter.hxx
@@ -356,7 +356,7 @@ TileImageFilter<TInputImage, TOutputImage>::GenerateOutputInformation()
 
 template <typename TInputImage, typename TOutputImage>
 void
-TileImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() ITKv5_CONST
+TileImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() const
 {
 
   // Do not call superclass's VerifyInputInformation method.
diff --git a/Modules/Filtering/ImageGrid/include/itkWarpImageFilter.h b/Modules/Filtering/ImageGrid/include/itkWarpImageFilter.h
index 3799be21acc3..99130cd50b05 100644
--- a/Modules/Filtering/ImageGrid/include/itkWarpImageFilter.h
+++ b/Modules/Filtering/ImageGrid/include/itkWarpImageFilter.h
@@ -251,7 +251,7 @@ class ITK_TEMPLATE_EXPORT WarpImageFilter : public ImageToImageFilter<TInputImag
    * \sa ProcessObject::VerifyInputInformation
    */
   void
-  VerifyInputInformation() ITKv5_CONST override;
+  VerifyInputInformation() const override;
 
   /** This function should be in an interpolator but none of the ITK
    * interpolators at this point handle edge conditions properly
diff --git a/Modules/Filtering/ImageGrid/include/itkWarpImageFilter.hxx b/Modules/Filtering/ImageGrid/include/itkWarpImageFilter.hxx
index 4c3380897f23..9482902c7a70 100644
--- a/Modules/Filtering/ImageGrid/include/itkWarpImageFilter.hxx
+++ b/Modules/Filtering/ImageGrid/include/itkWarpImageFilter.hxx
@@ -100,7 +100,7 @@ WarpImageFilter<TInputImage, TOutputImage, TDisplacementField>::SetOutputParamet
 
 template <typename TInputImage, typename TOutputImage, typename TDisplacementField>
 void
-WarpImageFilter<TInputImage, TOutputImage, TDisplacementField>::VerifyInputInformation() ITKv5_CONST
+WarpImageFilter<TInputImage, TOutputImage, TDisplacementField>::VerifyInputInformation() const
 {
   if (ImageDimension != GetDisplacementField()->GetNumberOfComponentsPerPixel())
   {
diff --git a/Modules/Filtering/ImageIntensity/include/itkDivideImageFilter.h b/Modules/Filtering/ImageIntensity/include/itkDivideImageFilter.h
index 925e14d577dd..5ed5b8652ffe 100644
--- a/Modules/Filtering/ImageIntensity/include/itkDivideImageFilter.h
+++ b/Modules/Filtering/ImageIntensity/include/itkDivideImageFilter.h
@@ -98,7 +98,7 @@ class ITK_TEMPLATE_EXPORT DivideImageFilter
   ~DivideImageFilter() override = default;
 
   void
-  VerifyPreconditions() ITKv5_CONST override
+  VerifyPreconditions() const override
   {
     Superclass::VerifyPreconditions();
 
diff --git a/Modules/Filtering/ImageIntensity/include/itkHistogramMatchingImageFilter.h b/Modules/Filtering/ImageIntensity/include/itkHistogramMatchingImageFilter.h
index 69b948741dc8..42c876d6c240 100644
--- a/Modules/Filtering/ImageIntensity/include/itkHistogramMatchingImageFilter.h
+++ b/Modules/Filtering/ImageIntensity/include/itkHistogramMatchingImageFilter.h
@@ -204,11 +204,11 @@ class ITK_TEMPLATE_EXPORT HistogramMatchingImageFilter : public ImageToImageFilt
    * \sa ProcessObject::VerifyInputInformation
    */
   void
-  VerifyInputInformation() ITKv5_CONST override
+  VerifyInputInformation() const override
   {}
 
   void
-  VerifyPreconditions() ITKv5_CONST override;
+  VerifyPreconditions() const override;
 
   /** Compute min, max and mean of an image. */
   void
diff --git a/Modules/Filtering/ImageIntensity/include/itkHistogramMatchingImageFilter.hxx b/Modules/Filtering/ImageIntensity/include/itkHistogramMatchingImageFilter.hxx
index 3c0d6cc87ffe..fc8e27b1d70a 100644
--- a/Modules/Filtering/ImageIntensity/include/itkHistogramMatchingImageFilter.hxx
+++ b/Modules/Filtering/ImageIntensity/include/itkHistogramMatchingImageFilter.hxx
@@ -110,7 +110,7 @@ HistogramMatchingImageFilter<TInputImage, TOutputImage, THistogramMeasurement>::
 
 template <typename TInputImage, typename TOutputImage, typename THistogramMeasurement>
 void
-HistogramMatchingImageFilter<TInputImage, TOutputImage, THistogramMeasurement>::VerifyPreconditions() ITKv5_CONST
+HistogramMatchingImageFilter<TInputImage, TOutputImage, THistogramMeasurement>::VerifyPreconditions() const
 {
   Superclass::VerifyPreconditions();
 
diff --git a/Modules/Filtering/Smoothing/include/itkRecursiveGaussianImageFilter.h b/Modules/Filtering/Smoothing/include/itkRecursiveGaussianImageFilter.h
index de2de01fffd6..22f3266bfcf7 100644
--- a/Modules/Filtering/Smoothing/include/itkRecursiveGaussianImageFilter.h
+++ b/Modules/Filtering/Smoothing/include/itkRecursiveGaussianImageFilter.h
@@ -217,7 +217,7 @@ class ITK_TEMPLATE_EXPORT RecursiveGaussianImageFilter : public RecursiveSeparab
   /* See superclass for doxygen. This method adds the additional check
    * that sigma is greater than zero. */
   void
-  VerifyPreconditions() ITKv5_CONST override;
+  VerifyPreconditions() const override;
 
 private:
   /** Compute the N coefficients in the recursive filter. */
diff --git a/Modules/Filtering/Smoothing/include/itkRecursiveGaussianImageFilter.hxx b/Modules/Filtering/Smoothing/include/itkRecursiveGaussianImageFilter.hxx
index b8bbb4bb1fb0..32a7eeafb627 100644
--- a/Modules/Filtering/Smoothing/include/itkRecursiveGaussianImageFilter.hxx
+++ b/Modules/Filtering/Smoothing/include/itkRecursiveGaussianImageFilter.hxx
@@ -323,7 +323,7 @@ RecursiveGaussianImageFilter<TInputImage, TOutputImage>::ComputeRemainingCoeffic
 
 template <typename TInputImage, typename TOutputImage>
 void
-RecursiveGaussianImageFilter<TInputImage, TOutputImage>::VerifyPreconditions() ITKv5_CONST
+RecursiveGaussianImageFilter<TInputImage, TOutputImage>::VerifyPreconditions() const
 {
   this->Superclass::VerifyPreconditions();
 
diff --git a/Modules/Filtering/Thresholding/include/itkHistogramThresholdImageFilter.h b/Modules/Filtering/Thresholding/include/itkHistogramThresholdImageFilter.h
index 8e3d80bf5ae7..73586ea8ed24 100644
--- a/Modules/Filtering/Thresholding/include/itkHistogramThresholdImageFilter.h
+++ b/Modules/Filtering/Thresholding/include/itkHistogramThresholdImageFilter.h
@@ -201,7 +201,7 @@ class ITK_TEMPLATE_EXPORT HistogramThresholdImageFilter : public ImageToImageFil
   GenerateData() override;
 
   void
-  VerifyPreconditions() ITKv5_CONST override
+  VerifyPreconditions() const override
   {
     Superclass::VerifyPreconditions();
     if (m_Calculator.IsNull())
diff --git a/Modules/Filtering/Thresholding/include/itkIntermodesThresholdImageFilter.h b/Modules/Filtering/Thresholding/include/itkIntermodesThresholdImageFilter.h
index 28d1e492b07a..c42a4eb8c8f0 100644
--- a/Modules/Filtering/Thresholding/include/itkIntermodesThresholdImageFilter.h
+++ b/Modules/Filtering/Thresholding/include/itkIntermodesThresholdImageFilter.h
@@ -118,7 +118,7 @@ class ITK_TEMPLATE_EXPORT IntermodesThresholdImageFilter
   ~IntermodesThresholdImageFilter() override = default;
 
   void
-  VerifyPreconditions() ITKv5_CONST override
+  VerifyPreconditions() const override
   {
     Superclass::VerifyPreconditions();
     if (dynamic_cast<const CalculatorType *>(Superclass::GetCalculator()) == nullptr)
diff --git a/Modules/Filtering/Thresholding/include/itkOtsuThresholdImageFilter.h b/Modules/Filtering/Thresholding/include/itkOtsuThresholdImageFilter.h
index 2bbb6d3c3922..793eb6925ce0 100644
--- a/Modules/Filtering/Thresholding/include/itkOtsuThresholdImageFilter.h
+++ b/Modules/Filtering/Thresholding/include/itkOtsuThresholdImageFilter.h
@@ -119,7 +119,7 @@ class ITK_TEMPLATE_EXPORT OtsuThresholdImageFilter
   }
 
   void
-  VerifyPreconditions() ITKv5_CONST override
+  VerifyPreconditions() const override
   {
     Superclass::VerifyPreconditions();
     if (dynamic_cast<const CalculatorType *>(Superclass::GetCalculator()) == nullptr)
diff --git a/Modules/Registration/PDEDeformable/include/itkDemonsRegistrationFilter.h b/Modules/Registration/PDEDeformable/include/itkDemonsRegistrationFilter.h
index bcd742d53ee9..a53b37c80f5d 100644
--- a/Modules/Registration/PDEDeformable/include/itkDemonsRegistrationFilter.h
+++ b/Modules/Registration/PDEDeformable/include/itkDemonsRegistrationFilter.h
@@ -144,7 +144,7 @@ class ITK_TEMPLATE_EXPORT DemonsRegistrationFilter
    * \sa ProcessObject::VerifyInputInformation
    */
   void
-  VerifyInputInformation() ITKv5_CONST override
+  VerifyInputInformation() const override
   {}
 
 private:
diff --git a/Modules/Registration/PDEDeformable/include/itkMultiResolutionPDEDeformableRegistration.h b/Modules/Registration/PDEDeformable/include/itkMultiResolutionPDEDeformableRegistration.h
index 72d079afd25e..d6bc2157a20c 100644
--- a/Modules/Registration/PDEDeformable/include/itkMultiResolutionPDEDeformableRegistration.h
+++ b/Modules/Registration/PDEDeformable/include/itkMultiResolutionPDEDeformableRegistration.h
@@ -283,7 +283,7 @@ class ITK_TEMPLATE_EXPORT MultiResolutionPDEDeformableRegistration
    * \sa ProcessObject::VerifyInputInformation
    */
   void
-  VerifyInputInformation() ITKv5_CONST override
+  VerifyInputInformation() const override
   {}
 
 private:
diff --git a/Modules/Segmentation/Classifiers/include/itkScalarImageKmeansImageFilter.h b/Modules/Segmentation/Classifiers/include/itkScalarImageKmeansImageFilter.h
index 4e31775f26ac..c38175c43515 100644
--- a/Modules/Segmentation/Classifiers/include/itkScalarImageKmeansImageFilter.h
+++ b/Modules/Segmentation/Classifiers/include/itkScalarImageKmeansImageFilter.h
@@ -167,7 +167,7 @@ class ITK_TEMPLATE_EXPORT ScalarImageKmeansImageFilter : public ImageToImageFilt
   /* See superclass for doxygen. This methods additionally checks that
    * the number of means is not 0. */
   void
-  VerifyPreconditions() ITKv5_CONST override;
+  VerifyPreconditions() const override;
 
 private:
   using MeansContainer = std::vector<RealPixelType>;
diff --git a/Modules/Segmentation/Classifiers/include/itkScalarImageKmeansImageFilter.hxx b/Modules/Segmentation/Classifiers/include/itkScalarImageKmeansImageFilter.hxx
index 737c60feb68a..1f2fa545252a 100644
--- a/Modules/Segmentation/Classifiers/include/itkScalarImageKmeansImageFilter.hxx
+++ b/Modules/Segmentation/Classifiers/include/itkScalarImageKmeansImageFilter.hxx
@@ -42,7 +42,7 @@ ScalarImageKmeansImageFilter<TInputImage, TOutputImage>::SetImageRegion(const Im
 
 template <typename TInputImage, typename TOutputImage>
 void
-ScalarImageKmeansImageFilter<TInputImage, TOutputImage>::VerifyPreconditions() ITKv5_CONST
+ScalarImageKmeansImageFilter<TInputImage, TOutputImage>::VerifyPreconditions() const
 {
   this->Superclass::VerifyPreconditions();
 
diff --git a/Modules/Segmentation/Watersheds/include/itkIsolatedWatershedImageFilter.h b/Modules/Segmentation/Watersheds/include/itkIsolatedWatershedImageFilter.h
index 54a22bc9cabe..82bc1180be90 100644
--- a/Modules/Segmentation/Watersheds/include/itkIsolatedWatershedImageFilter.h
+++ b/Modules/Segmentation/Watersheds/include/itkIsolatedWatershedImageFilter.h
@@ -141,7 +141,7 @@ class ITK_TEMPLATE_EXPORT IsolatedWatershedImageFilter : public ImageToImageFilt
   EnlargeOutputRequestedRegion(DataObject * output) override;
 
   void
-  VerifyInputInformation() ITKv5_CONST override;
+  VerifyInputInformation() const override;
   void
   GenerateData() override;
 };
diff --git a/Modules/Segmentation/Watersheds/include/itkIsolatedWatershedImageFilter.hxx b/Modules/Segmentation/Watersheds/include/itkIsolatedWatershedImageFilter.hxx
index 2f6669c929a6..2a81ee485bdc 100644
--- a/Modules/Segmentation/Watersheds/include/itkIsolatedWatershedImageFilter.hxx
+++ b/Modules/Segmentation/Watersheds/include/itkIsolatedWatershedImageFilter.hxx
@@ -61,7 +61,7 @@ IsolatedWatershedImageFilter<TInputImage, TOutputImage>::EnlargeOutputRequestedR
 
 template <typename TInputImage, typename TOutputImage>
 void
-IsolatedWatershedImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() ITKv5_CONST
+IsolatedWatershedImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() const
 {
   Superclass::VerifyInputInformation();