diff --git a/csharp/random-writer/src/RandomWriter/RandomWriter.csproj b/csharp/random-writer/src/RandomWriter/RandomWriter.csproj
index 1a3dbe32e..f344f9e2d 100644
--- a/csharp/random-writer/src/RandomWriter/RandomWriter.csproj
+++ b/csharp/random-writer/src/RandomWriter/RandomWriter.csproj
@@ -2,16 +2,16 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Amazon.CDK" Version="*" />
-    <PackageReference Include="Amazon.CDK.AWS.DynamoDb" Version="*" />
-    <PackageReference Include="Amazon.CDK.AWS.Events" Version="*" />
-    <PackageReference Include="Amazon.CDK.AWS.Events.Targets" Version="*" />
-    <PackageReference Include="Amazon.CDK.AWS.Lambda" Version="*" />
+    <PackageReference Include="Amazon.CDK" Version="1.31.0" />
+    <PackageReference Include="Amazon.CDK.AWS.DynamoDb" Version="1.31.0" />
+    <PackageReference Include="Amazon.CDK.AWS.Events" Version="1.31.0" />
+    <PackageReference Include="Amazon.CDK.AWS.Events.Targets" Version="1.31.0" />
+    <PackageReference Include="Amazon.CDK.AWS.Lambda" Version="1.31.0" />
 
-    <PackageReference Include="Amazon.JSII.Analyzers" Version="*" />
+    <PackageReference Include="Amazon.JSII.Analyzers" Version="1.1.0" />
   </ItemGroup>
 </Project>