diff --git a/gitlab-runner/Dockerfile b/gitlab-runner/Dockerfile
index f455597..f5a059c 100644
--- a/gitlab-runner/Dockerfile
+++ b/gitlab-runner/Dockerfile
@@ -1,7 +1,7 @@
 #
 # Base image
 #
-FROM --platform=linux/amd64 ubuntu:24.04
+FROM --platform=linux/amd64 ubuntu:26.04@sha256:5e275723f82c67e387ba9e3c24baa0abdcb268917f276a0561c97bef9450d0b4
 
 ARG http_proxy=${http_proxy:-}
 ARG https_proxy=${https_proxy:-}