diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c1e9598..d7db9e4 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,4 @@
-image: docker.io/library/eclipse-temurin:25-jdk-alpine
+image: docker.io/library/eclipse-temurin:25-jdk-alpine@sha256:da683f4f02f9427597d8fa162b73b8222fe08596dcebaf23e4399576ff8b037e
 
 variables:
   MAVEN_OPTS: >-
diff --git a/Dockerfile b/Dockerfile
index 8d1720e..7f13d62 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM docker.io/library/eclipse-temurin:25-jre
+FROM docker.io/library/eclipse-temurin:25-jre@sha256:0a9c973778b03b88f39ccae4f8cc26022d84a3237a818cb98770369eb6c5daf9
 
 RUN apt-get update && apt-get install -y --no-install-recommends netcat-openbsd curl && rm -rf /var/lib/apt/lists/*