diff --git a/.woodpecker/.backend.yml b/.woodpecker/.backend.yml
index 4f0c694..3483c88 100644
--- a/.woodpecker/.backend.yml
+++ b/.woodpecker/.backend.yml
@@ -1,6 +1,6 @@
 ---
 variables:
-  - &java_image "gradle:8.5.0-jdk17@sha256:c216f357d9e4fb3b43f318665d166e05fe9ba8dea4f962c6346a1b4d197e80e7"
+  - &java_image "gradle:8.5.0-jdk21"
 when:
   path: "app/**"
   event: [push, tag]