diff --git a/.gitlab/ci/frontend.gitlab-ci.yml b/.gitlab/ci/frontend.gitlab-ci.yml
index cd6953a6ac2..65ff3393ebb 100644
--- a/.gitlab/ci/frontend.gitlab-ci.yml
+++ b/.gitlab/ci/frontend.gitlab-ci.yml
@@ -8,7 +8,7 @@
 
 .use-pg: &use-pg
   services:
-    - name: postgres:9.6
+    - name: postgres:9.6.11
       command: ["postgres", "-c", "fsync=off", "-c", "synchronous_commit=off", "-c", "full_page_writes=off"]
     - name: redis:alpine
 
diff --git a/.gitlab/ci/rails.gitlab-ci.yml b/.gitlab/ci/rails.gitlab-ci.yml
index 6551f47d3be..dd1d46c9fa2 100644
--- a/.gitlab/ci/rails.gitlab-ci.yml
+++ b/.gitlab/ci/rails.gitlab-ci.yml
@@ -1,6 +1,6 @@
 .use-pg: &use-pg
   services:
-    - name: postgres:9.6
+    - name: postgres:9.6.11
       command: ["postgres", "-c", "fsync=off", "-c", "synchronous_commit=off", "-c", "full_page_writes=off"]
     - name: redis:alpine
 
diff --git a/changelogs/unreleased/use-pg-9-6-11-on-ci.yml b/changelogs/unreleased/use-pg-9-6-11-on-ci.yml
new file mode 100644
index 00000000000..785eb352895
--- /dev/null
+++ b/changelogs/unreleased/use-pg-9-6-11-on-ci.yml
@@ -0,0 +1,5 @@
+---
+title: Use PostgreSQL 9.6.11 in CI tests
+merge_request: 30270
+author: Takuya Noguchi
+type: other