diff --git a/build.gradle b/build.gradle
index 49a4027..acc2bc6 100644
--- a/build.gradle
+++ b/build.gradle
@@ -29,7 +29,7 @@ ext {
 }
 
 wrapper {
-    gradleVersion = '5.4.1'
+    gradleVersion = '6.0.1'
 }
 
 sourceCompatibility = 1.8
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index 91ca28c..cc4fdc2 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 9c4d86b..1311a84 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Sat Jun 15 01:03:29 CEST 2019
+#Sun Dec 01 16:07:11 CET 2019
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.0.1-all.zip
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip
+zipStoreBase=GRADLE_USER_HOME
diff --git a/gradlew b/gradlew
index cccdd3d..2fe81a7 100755
--- a/gradlew
+++ b/gradlew
@@ -1,5 +1,21 @@
 #!/usr/bin/env sh
 
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
 ##############################################################################
 ##
 ##  Gradle start up script for UN*X
@@ -28,7 +44,7 @@ APP_NAME="Gradle"
 APP_BASE_NAME=`basename "$0"`
 
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS=""
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD="maximum"
@@ -109,8 +125,8 @@ if $darwin; then
     GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
 fi
 
-# For Cygwin, switch paths to Windows format before running java
-if $cygwin ; then
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
     APP_HOME=`cygpath --path --mixed "$APP_HOME"`
     CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
     JAVACMD=`cygpath --unix "$JAVACMD"`
@@ -138,19 +154,19 @@ if $cygwin ; then
         else
             eval `echo args$i`="\"$arg\""
         fi
-        i=$((i+1))
+        i=`expr $i + 1`
     done
     case $i in
-        (0) set -- ;;
-        (1) set -- "$args0" ;;
-        (2) set -- "$args0" "$args1" ;;
-        (3) set -- "$args0" "$args1" "$args2" ;;
-        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
-        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
-        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
-        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
-        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
-        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
     esac
 fi
 
@@ -159,14 +175,9 @@ save () {
     for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
     echo " "
 }
-APP_ARGS=$(save "$@")
+APP_ARGS=`save "$@"`
 
 # Collect all arguments for the java command, following the shell quoting and substitution rules
 eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
 
-# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
-if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
-  cd "$(dirname "$0")"
-fi
-
 exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
index e95643d..24467a1 100644
--- a/gradlew.bat
+++ b/gradlew.bat
@@ -1,3 +1,19 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
 @if "%DEBUG%" == "" @echo off
 @rem ##########################################################################
 @rem
@@ -14,7 +30,7 @@ set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
 @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-set DEFAULT_JVM_OPTS=
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
 
 @rem Find java.exe
 if defined JAVA_HOME goto findJavaFromJavaHome
diff --git a/src/main/groovy/com/github/alisiikh/scalastyle/ScalastyleCheckTask.groovy b/src/main/groovy/com/github/alisiikh/scalastyle/ScalastyleCheckTask.groovy
index ea793f5..a351ec7 100644
--- a/src/main/groovy/com/github/alisiikh/scalastyle/ScalastyleCheckTask.groovy
+++ b/src/main/groovy/com/github/alisiikh/scalastyle/ScalastyleCheckTask.groovy
@@ -29,22 +29,21 @@ class ScalastyleCheckTask extends SourceTask {
 
     @PathSensitive(PathSensitivity.ABSOLUTE)
     @InputFile
-    Property<File> config = project.objects.property(File)
+    final Property<File> config = project.objects.property(File)
 
-    @PathSensitive(PathSensitivity.ABSOLUTE)
     @OutputFile
-    Property<File> output = project.objects.property(File)
+    final Property<File> output = project.objects.property(File)
 
     @Input
-    Property<String> inputEncoding = project.objects.property(String)
+    final Property<String> inputEncoding = project.objects.property(String)
     @Input
-    Property<String> outputEncoding = project.objects.property(String)
+    final Property<String> outputEncoding = project.objects.property(String)
     @Input
-    Property<Boolean> failOnWarning = project.objects.property(Boolean)
+    final Property<Boolean> failOnWarning = project.objects.property(Boolean)
     @Input
-    Property<Boolean> verbose = project.objects.property(Boolean)
+    final Property<Boolean> verbose = project.objects.property(Boolean)
     @Input
-    Property<Boolean> quiet = project.objects.property(Boolean)
+    final Property<Boolean> quiet = project.objects.property(Boolean)
 
     @TaskAction
     def run() {
diff --git a/src/main/groovy/com/github/alisiikh/scalastyle/ScalastylePlugin.groovy b/src/main/groovy/com/github/alisiikh/scalastyle/ScalastylePlugin.groovy
index c77d93a..f12d96a 100644
--- a/src/main/groovy/com/github/alisiikh/scalastyle/ScalastylePlugin.groovy
+++ b/src/main/groovy/com/github/alisiikh/scalastyle/ScalastylePlugin.groovy
@@ -69,14 +69,15 @@ class ScalastylePlugin implements Plugin<Project> {
                     onlyIf { !shouldSkipTask.get() }
 
                     source = sourceSet.scala.srcDirs
-                    output = sourceSetConfig.output
-                    config = resolveScalastyleConfig(sourceSetConfig, sourceSet.name)
-                    failOnWarning = sourceSetConfig.failOnWarning.isPresent() ?
-                            sourceSetConfig.failOnWarning : extension.failOnWarning
-                    verbose = extension.verbose
-                    quiet = extension.quiet
-                    outputEncoding = extension.outputEncoding
-                    inputEncoding = extension.inputEncoding
+
+                    output.set(sourceSetConfig.output)
+                    config.set(resolveScalastyleConfig(sourceSetConfig, sourceSet.name))
+                    failOnWarning.set(sourceSetConfig.failOnWarning.isPresent() ?
+                            sourceSetConfig.failOnWarning : extension.failOnWarning)
+                    verbose.set(extension.verbose)
+                    quiet.set(extension.quiet)
+                    outputEncoding.set(extension.outputEncoding)
+                    inputEncoding.set(extension.inputEncoding)
                 }
             }