diff --git a/.gitlab/ci/gitaly.images.yml b/.gitlab/ci/gitaly.images.yml
index 6a10d7d..d5cd11a 100644
--- a/.gitlab/ci/gitaly.images.yml
+++ b/.gitlab/ci/gitaly.images.yml
@@ -17,7 +17,7 @@ gitaly:
   stage: gitaly
   parallel:
     matrix:
-      - OS: ['debian:bullseye', 'debian:bookworm']
+      - OS: ['debian:bookworm']
         GOLANG: ['1.20', '1.21']
         RUST: ['1.73']
         GIT: ['2.36']
diff --git a/.gitlab/ci/gitlab.images.yml b/.gitlab/ci/gitlab.images.yml
index c24f0f3..08e8762 100644
--- a/.gitlab/ci/gitlab.images.yml
+++ b/.gitlab/ci/gitlab.images.yml
@@ -41,7 +41,7 @@ gitlab:
     NODE: '18.17'
   parallel:
     matrix:
-      - OS: ['debian:bullseye', 'debian:bullseye-slim', 'debian:bookworm', 'debian:bookworm-slim']
+      - OS: ['debian:bookworm', 'debian:bookworm-slim']
         RUBY: ['3.0.patched', '3.1.patched', '3.2.patched']
         POSTGRESQL: ['13', '14', '15']
         GOLANG: ['1.20', '1.21']
@@ -60,7 +60,7 @@ gitlab-assets:
     ARCH: amd64,arm64
   parallel:
     matrix:
-      - OS: ['debian:bullseye', 'debian:bookworm']
+      - OS: ['debian:bookworm']
         RUBY: ['3.0', '3.1', '3.2']
         GIT: ['2.33']
         NODE: ['18.17']
@@ -84,7 +84,7 @@ gitlab-slim-ruby:
   parallel:
     matrix:
       - RUBY: ['3.0', '3.1', '3.2']
-        OS: ['debian:bullseye-slim', 'debian:bookworm-slim']
+        OS: ['debian:bookworm-slim']
 
 # Used by GitLab's workhorse tests
 gitlab-workhorse:
@@ -97,7 +97,7 @@ gitlab-workhorse:
     RUBYGEMS: '3.4'
   parallel:
     matrix:
-      - OS: ['debian:bullseye', 'debian:bookworm']
+      - OS: ['debian:bookworm']
         RUBY: ['3.0', '3.1', '3.2']
         GOLANG: ['1.20', '1.21']
         RUST: ['1.73']