diff --git a/spring-postgres/backend/Dockerfile b/spring-postgres/backend/Dockerfile
index e01b895..a3b670a 100755
--- a/spring-postgres/backend/Dockerfile
+++ b/spring-postgres/backend/Dockerfile
@@ -28,7 +28,7 @@ RUN mkdir -p target/dependency
 WORKDIR /workdir/server/target/dependency
 RUN jar -xf ../*.jar
 
-FROM eclipse-temurin:17-jre-focal
+FROM eclipse-temurin:17-jre-focal@sha256:55c1ff40a91898c456dc5a874a66db17b6aa1b4aef8d9cac1ad3b194575638a1
 
 EXPOSE 8080
 VOLUME /tmp