diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ef5f7d1..bd1b099 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,14 +16,20 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        java: [ '8', '11', '16', '17', '19' ]
+        java: [ '8', '11', '16', '17', '19', '21' ]
         runs-on: [ubuntu-latest, macos-latest, windows-latest]
+        exclude:
+          - runs-on: macos-latest
+            java: "8"
+          - runs-on: macos-latest
+            java: "16"
+
 
     name: Test on Java ${{ matrix.Java }} on ${{ matrix.runs-on }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up JDK ${{ matrix.Java }}
-      uses: actions/setup-java@v3
+      uses: actions/setup-java@v4
       with:
         java-version: ${{ matrix.Java }}
         distribution: 'temurin'
diff --git a/.github/workflows/examples.yml b/.github/workflows/examples.yml
index b3b5947..14fb26b 100644
--- a/.github/workflows/examples.yml
+++ b/.github/workflows/examples.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: nelonoel/branch-name@v1.0.1
 
     # https://stackoverflow.com/questions/58033366/how-to-get-current-branch-within-github-actions
@@ -20,7 +20,7 @@ jobs:
       id: extract_branch
 
     - name: Checkout lems
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         repository: LEMS/LEMS
         ref: ${{ steps.extract_branch.outputs.branch }}
diff --git a/pom.xml b/pom.xml
index eaf7e54..6b726e0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -29,8 +29,8 @@
 				<artifactId>maven-compiler-plugin</artifactId>
                 <version>3.0</version>
 				<configuration>
-					<source>1.7</source>
-					<target>1.7</target>
+					<source>1.8</source>
+					<target>1.8</target>
 				</configuration>
 			</plugin>
 			<plugin>