diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 969ce612..050c0d65 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -18,11 +18,11 @@
   image_dindruby: &image_dindruby 'techneg/ci-docker-python-ruby:v2.2.55@sha256:1e4685e62a274c227c9cb08c80750e9961834777b53bb9e7c5faf6c0d8a07d1e'
   image_dindrubybionic: &image_dindrubybionic 'techneg/ci-docker-python-ruby:v2.2.55@sha256:1e4685e62a274c227c9cb08c80750e9961834777b53bb9e7c5faf6c0d8a07d1e'
   image_precommit: &image_precommit 'techneg/ci-pre-commit:v2.4.20@sha256:16ef5422c57c3ac998e15993e49ef76a6ff116b1faeecf61bb53309510f2a0b9'
-  image_rubocop: &image_rubocop 'pipelinecomponents/rubocop:latest'
-  image_semantic-release: &image_semanticrelease 'myii/ssf-semantic-release:15.14'
+  image_rubocop: &image_rubocop 'pipelinecomponents/rubocop:latest@sha256:fe69f9642c7edde46bbd78326d2c42c6e13fc73694efb142e92e206725479328'
+  image_semantic-release: &image_semanticrelease 'myii/ssf-semantic-release:15.14@sha256:374f588420087517a3cc0235e11293bffd72d7a59da3d98d5e69f014ff2a7761'
   # `services`
   services_docker_dind: &services_docker_dind
-    - 'docker:dind'
+    - 'docker:dind@sha256:3a861ec98623bd6014610291123751dc19e0c6d474ac3b38767771791ac0eb5e'
   # yamllint enable rule:line-length
   # `variables`
   # https://forum.gitlab.com/t/gitlab-com-ci-caching-rubygems/5627/3