diff --git a/build.gradle b/build.gradle
index dce6cf8fdf..46804be088 100644
--- a/build.gradle
+++ b/build.gradle
@@ -232,7 +232,7 @@ subprojects { subproject ->
 								def years = "$beginningYear-$now"
 								def sourceCode = file.text
 								sourceCode = sourceCode.replaceFirst(/20\d\d(-20\d\d)?/, years)
-								file.write(sourceCode)
+								file.text = sourceCode
 								println "Copyright updated for file: $file"
 							}
 							break
diff --git a/gradle.properties b/gradle.properties
index fa9ef2b6dd..f635866aca 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1 +1,2 @@
 version=5.1.4.BUILD-SNAPSHOT
+org.gradle.jvmargs='-Dfile.encoding=UTF-8'
diff --git a/spring-integration-file/src/test/java/org/springframework/integration/file/transformer/AbstractFilePayloadTransformerTests.java b/spring-integration-file/src/test/java/org/springframework/integration/file/transformer/AbstractFilePayloadTransformerTests.java
index 46a39802b8..df442dbded 100644
--- a/spring-integration-file/src/test/java/org/springframework/integration/file/transformer/AbstractFilePayloadTransformerTests.java
+++ b/spring-integration-file/src/test/java/org/springframework/integration/file/transformer/AbstractFilePayloadTransformerTests.java
@@ -42,7 +42,7 @@ public abstract class AbstractFilePayloadTransformerTests<T extends AbstractFile
 
 	static final String DEFAULT_ENCODING = "UTF-8";
 
-	static final String SAMPLE_CONTENT = "HelloWorld\n????";
+	static final String SAMPLE_CONTENT = "HelloWorld\näöüß";
 
 	T transformer;