diff --git a/.travis.yml b/.travis.yml
index c1f5cbf3d1..17b6e60c75 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,13 +8,14 @@ before_install:
 install: true
 script:
   - ./.ci/ci.sh
+# lines commented out below are a temporary workaround for https://github.com/diffplug/spotless/issues/429
 before_cache:
-  - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
-  - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
+#  - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
+#  - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
   - rm -fr plugin-maven/build/localMavenRepository/com/diffplug/spotless/
 cache:
   directories:
-  - $HOME/.gradle/caches/
-  - $HOME/.gradle/wrapper/
+#  - $HOME/.gradle/caches/
+#  - $HOME/.gradle/wrapper/
   - $HOME/.m2/
   - plugin-maven/build/localMavenRepository/
diff --git a/build.gradle b/build.gradle
index 8b4e78dd77..6c5eef0aed 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,15 +1,3 @@
-buildscript {
-	repositories {
-		maven {
-			url 'https://plugins.gradle.org/m2/'
-		}
-	}
-	dependencies {
-		classpath "gradle.plugin.com.github.spotbugs:spotbugs-gradle-plugin:${VER_SPOTBUGS_PLUGIN}"
-		classpath "com.google.guava:guava:27.1-jre" // Force newer version for spotbugs
-	}
-}
-
 plugins {
 	// dependencyUpdates https://github.com/ben-manes/gradle-versions-plugin/releases
 	id 'com.github.ben-manes.versions' version '0.22.0'
@@ -25,6 +13,8 @@ plugins {
 	id 'org.jdrupes.mdoclet' version '1.0.5' apply false
 	// https://github.com/ajoberstar/gradle-git-publish/releases
 	id 'org.ajoberstar.git-publish' version '2.1.1' apply false
+	// https://github.com/spotbugs/spotbugs/releases
+	id "com.github.spotbugs" version "2.0.0" apply false
 }
 
 buildScan {
@@ -44,3 +34,7 @@ eclipseResourceFilters {
 	exclude().folders().name('plugin-maven')
 	exclude().folders().name('testlib')
 }
+
+static Class<?> spotBugsTaskType() {
+	return com.github.spotbugs.SpotBugsTask
+}
diff --git a/gradle.properties b/gradle.properties
index f1081feec9..1cbb63ede7 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -22,7 +22,6 @@ artifactIdGradle=spotless-plugin-gradle
 # Build requirements
 VER_JAVA=1.8
 VER_SPOTBUGS=3.1.6
-VER_SPOTBUGS_PLUGIN=2.0.0
 
 # Used in multiple places
 VER_DURIAN=1.2.0
diff --git a/gradle/java-setup.gradle b/gradle/java-setup.gradle
index 31c729168b..0d55295a9e 100644
--- a/gradle/java-setup.gradle
+++ b/gradle/java-setup.gradle
@@ -1,12 +1,3 @@
-buildscript {
-	repositories {
-		maven {
-			url 'https://plugins.gradle.org/m2/'
-		}
-	}
-	dependencies { classpath "gradle.plugin.com.github.spotbugs:spotbugs-gradle-plugin:${VER_SPOTBUGS_PLUGIN}" }
-}
-
 //////////
 // JAVA //
 //////////
@@ -54,7 +45,7 @@ spotbugs {
 	omitVisitors = []		// bugs that we want to ignore
 }
 // HTML instead of XML
-tasks.withType(com.github.spotbugs.SpotBugsTask) {
+tasks.withType(spotBugsTaskType()) {
 	reports {
 		xml.enabled = false
 		html.enabled = true
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index f6b961fd5a..5c2d1cf016 100755
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 430dfabc5c..8d58bda447 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.5.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.6-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
index cccdd3d517..83f2acfdc3 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"`
diff --git a/gradlew.bat b/gradlew.bat
index f9553162f1..9618d8d960 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