diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index 74c342f..40da089 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -16,9 +16,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up JDK 11
+    - name: Set up JDK 8
       uses: actions/setup-java@v1
       with:
-        java-version: 11
+        java-version: 8
     - name: Build with Maven
       run: mvn -B package --file pom.xml
diff --git a/pom.xml b/pom.xml
index 394b5e6..84bde2f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -48,8 +48,7 @@
   </developers>
 
   <properties>
-    <maven.compiler.target>11</maven.compiler.target>
-    <maven.compiler.source>11</maven.compiler.source>
+    <maven.compiler.release>8</maven.compiler.release>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
   </properties>
 
diff --git a/src/test/java/org/greenbytes/http/sfv/SpecificationTests.java b/src/test/java/org/greenbytes/http/sfv/SpecificationTests.java
index edd9e91..79a957b 100644
--- a/src/test/java/org/greenbytes/http/sfv/SpecificationTests.java
+++ b/src/test/java/org/greenbytes/http/sfv/SpecificationTests.java
@@ -5,6 +5,7 @@
 import org.junit.runners.Parameterized;
 
 import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
@@ -68,7 +69,9 @@ public void runTest() {
 
         if (outputPath != null) {
             try {
-                Files.writeString(outputPath, testOutput, StandardOpenOption.APPEND, StandardOpenOption.CREATE);
+                Files.write(outputPath,
+                        testOutput.toString().getBytes(StandardCharsets.UTF_8),
+                        StandardOpenOption.APPEND, StandardOpenOption.CREATE);
             } catch (Exception ex) {
                 System.err.printf("Can't write to %s%n.", outputPath);
             }