diff --git a/.github/workflows/flyio-deploy.yml b/.github/workflows/flyio-deploy.yml
index 907a080..c28a4eb 100644
--- a/.github/workflows/flyio-deploy.yml
+++ b/.github/workflows/flyio-deploy.yml
@@ -30,8 +30,8 @@ jobs:
       - name: Prepare java
         uses: actions/setup-java@v4
         with:
-          distribution: 'adopt'
-          java-version: '11'
+          distribution: 'temurin'
+          java-version: '21'
 
       - name: Install clojure cli
         uses: DeLaGuardo/setup-clojure@master
@@ -58,8 +58,8 @@ jobs:
       - name: Prepare java
         uses: actions/setup-java@v4
         with:
-          distribution: 'adopt'
-          java-version: '11'
+          distribution: 'temurin'
+          java-version: '21'
 
       - name: Install clojure cli
         uses: DeLaGuardo/setup-clojure@master
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index e2900b7..47867df 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -27,8 +27,8 @@ jobs:
       - name: Prepare java
         uses: actions/setup-java@v4
         with:
-          distribution: 'adopt'
-          java-version: '11'
+          distribution: 'temurin'
+          java-version: '21'
 
       - name: Install clojure cli
         uses: DeLaGuardo/setup-clojure@master
diff --git a/Dockerfile b/Dockerfile
index 0e54f65..a9ae072 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,8 @@
 # Dockerfile for fly.io deploy
 
-FROM openjdk:11-slim-buster AS runtime
+FROM eclipse-temurin:21 AS runtime
 COPY service.jar /app.jar
 
-ENV JAVA_OPTS="-XX:+UseContainerSupport -XX:InitialRAMPercentage=50 -XX:MaxRAMPercentage=90 -XshowSettings:vm"
+ENV JAVA_OPTS="-XX:+UseContainerSupport -XX:InitialRAMPercentage=50 -XX:MaxRAMPercentage=90 -XshowSettings:vm --add-opens=java.base/java.nio=ALL-UNNAMED --add-opens=java.base/sun.nio.ch=ALL-UNNAMED"
 
 ENTRYPOINT ["sh", "-c", "java $JAVA_OPTS -jar /app.jar"]