diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5b59716b..7f9d6062 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,12 +14,12 @@ jobs:
         java-version: [8, 9, 10, 11]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.1
       - name: Set up JDK ${{ matrix.java-version }}
-        uses: actions/setup-java@v2
+        uses: actions/setup-java@v2.3.1
         with:
           java-version: "${{ matrix.java-version }}"
-          distribution: "adopt"
+          distribution: "adopt-openj9"
       - name: Build & Test
         run: ./gradlew jacocoTestReport test
       - name: Code coverage
diff --git a/build.gradle b/build.gradle
index b9d7a047..3d820156 100644
--- a/build.gradle
+++ b/build.gradle
@@ -44,7 +44,7 @@ repositories {
 }
 
 dependencies {
-	compile "com.google.code.gson:gson:2.2.2"
+	compile "com.google.code.gson:gson:2.8.9"
 	compile "org.java-websocket:Java-WebSocket:1.5.1"
 
 	testCompile "org.mockito:mockito-all:1.8.5"