diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 8dbc85c..bf663b7 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -11,19 +11,20 @@ on:
 jobs:
   package:
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
-    - name: Set up JDK 11
-      uses: actions/setup-java@v1
+    - name: Set up JDK 17
+      uses: actions/setup-java@v3
       with:
-        java-version: 11
+        java-version: 17
+        distribution: temurin
 
     - name: Checkout Code
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Cache Maven packages
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: ~/.m2
         key: confapi-plugin-${{ hashFiles('**/pom.xml') }}
@@ -38,23 +39,24 @@ jobs:
   unit-tests:
     needs: package
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     env:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
 
     steps:
-    - name: Set up JDK 11
-      uses: actions/setup-java@v1
+    - name: Set up JDK 17
+      uses: actions/setup-java@v3
       with:
-        java-version: 11
+        java-version: 17
+        distribution: temurin
 
     - name: Checkout Code
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Cache Maven package
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: ~/.m2
         key: confapi-plugin-${{ hashFiles('**/pom.xml') }}
@@ -66,19 +68,21 @@ jobs:
   integration-tests:
     needs: package
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
     - name: Set up JDK 11
-      uses: actions/setup-java@v1
+      uses: actions/setup-java@v3
       with:
+        # Crowd and thus the integration tests are not compatible with Java 17
         java-version: 11
+        distribution: temurin
 
     - name: Checkout Code
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Cache Maven package
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: ~/.m2
         key: confapi-plugin-${{ hashFiles('**/pom.xml') }}
@@ -92,7 +96,7 @@ jobs:
 
     if: github.event_name == 'push' # to 'main'
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     env:
       GPG_KEY_NAME: ${{ secrets.GPG_KEY_NAME }}
@@ -104,16 +108,17 @@ jobs:
       SIGN_ASC_IV: ${{ secrets.SIGN_ASC_IV }}
 
     steps:
-    - name: Set up JDK 11
-      uses: actions/setup-java@v1
+    - name: Set up JDK 17
+      uses: actions/setup-java@v3
       with:
-        java-version: 11
+        java-version: 17
+        distribution: temurin
 
     - name: Checkout Code
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Cache Maven package
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: ~/.m2
         key: confapi-plugin-${{ hashFiles('**/pom.xml') }}
@@ -131,19 +136,20 @@ jobs:
   apcc:
     needs: package
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
-    - name: Set up JDK 11
-      uses: actions/setup-java@v1
+    - name: Set up JDK 17
+      uses: actions/setup-java@v3
       with:
-        java-version: 11
+        java-version: 17
+        distribution: temurin
 
     - name: Checkout Code
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Cache Maven package
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: ~/.m2
         key: confapi-plugin-${{ hashFiles('**/pom.xml') }}
diff --git a/pom.xml b/pom.xml
index 57bd3c0..9d7f0ec 100644
--- a/pom.xml
+++ b/pom.xml
@@ -68,8 +68,9 @@
         <atlassian.spring.scanner.version>2.1.5</atlassian.spring.scanner.version>
         <confapi-commons.version>0.0.34</confapi-commons.version>
         <plugin.testrunner.version>2.0.1</plugin.testrunner.version>
-        <maven.compiler.source>11</maven.compiler.source>
-        <maven.compiler.target>11</maven.compiler.target>
+        <!-- Compiler must be 8 so that the plugin can run on Crowd instances using Java 8 -->
+        <maven.compiler.source>8</maven.compiler.source>
+        <maven.compiler.target>8</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
     </properties>