diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 1f366b692b4ec8ff80d7566c42361d45bc4eac14_Q09OVFJJQlVUSU5HLm1k..f1d32a07f0dc76a3786c3079c20abc53c2cca4c0_Q09OVFJJQlVUSU5HLm1k 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -166,11 +166,10 @@
 
 ## Unofficial packaging point of contact
 
-The omnibus-gitlab project is a project used for building official GitLab packages.
-There are multiple community driven projects for packaging, such as [GitLab CE unofficial Debian 9](https://packages.debian.org/stretch/gitlab) package.
-
-If you are a maintainer or point of contact for a such project, and you require
-assistance or just want to talk about GitLab, please raise [an issue in the omnibus-gitlab project](https://gitlab.com/gitlab-org/omnibus-gitlab/issues).
+The omnibus-gitlab project is a project used for building official GitLab
+packages. If you are a maintainer or point of contact for a such project, and
+you require assistance or just want to talk about GitLab, please raise
+[an issue in the omnibus-gitlab project](https://gitlab.com/gitlab-org/omnibus-gitlab/issues).
 
 ## Code of conduct
 
diff --git a/files/gitlab-cookbooks/package/libraries/omnibus_helper.rb b/files/gitlab-cookbooks/package/libraries/omnibus_helper.rb
index 1f366b692b4ec8ff80d7566c42361d45bc4eac14_ZmlsZXMvZ2l0bGFiLWNvb2tib29rcy9wYWNrYWdlL2xpYnJhcmllcy9vbW5pYnVzX2hlbHBlci5yYg==..f1d32a07f0dc76a3786c3079c20abc53c2cca4c0_ZmlsZXMvZ2l0bGFiLWNvb2tib29rcy9wYWNrYWdlL2xpYnJhcmllcy9vbW5pYnVzX2hlbHBlci5yYg== 100644
--- a/files/gitlab-cookbooks/package/libraries/omnibus_helper.rb
+++ b/files/gitlab-cookbooks/package/libraries/omnibus_helper.rb
@@ -197,7 +197,7 @@
     message = <<~EOS
       Your OS, #{os_string}, will be deprecated soon.
       Starting with #{deprecated_os[matching_list.first]}, packages will not be built for it.
-      Switch or upgrade to a supported OS, see https://docs.gitlab.com/omnibus/package-information/deprecated_os.html for more information.
+      Switch or upgrade to a supported OS, see https://docs.gitlab.com/ee/administration/package_information/supported_os.html for more information.
     EOS
 
     LoggingHelper.deprecation(message)
diff --git a/gitlab-ci-config/check-packages.yml b/gitlab-ci-config/check-packages.yml
index 1f366b692b4ec8ff80d7566c42361d45bc4eac14_Z2l0bGFiLWNpLWNvbmZpZy9jaGVjay1wYWNrYWdlcy55bWw=..f1d32a07f0dc76a3786c3079c20abc53c2cca4c0_Z2l0bGFiLWNpLWNvbmZpZy9jaGVjay1wYWNrYWdlcy55bWw= 100644
--- a/gitlab-ci-config/check-packages.yml
+++ b/gitlab-ci-config/check-packages.yml
@@ -72,9 +72,6 @@
   extends: .apt-install
   tags:
   - docker-arm-builder
-Debian-9-check:
-  image: "${BUILDER_IMAGE_REGISTRY}/debian_9:${BUILDER_IMAGE_REVISION}"
-  extends: .apt-install
 Debian-10-check:
   image: "${BUILDER_IMAGE_REGISTRY}/debian_10:${BUILDER_IMAGE_REVISION}"
   extends: .apt-install
diff --git a/gitlab-ci-config/dev-gitlab-org.yml b/gitlab-ci-config/dev-gitlab-org.yml
index 1f366b692b4ec8ff80d7566c42361d45bc4eac14_Z2l0bGFiLWNpLWNvbmZpZy9kZXYtZ2l0bGFiLW9yZy55bWw=..f1d32a07f0dc76a3786c3079c20abc53c2cca4c0_Z2l0bGFiLWNpLWNvbmZpZy9kZXYtZ2l0bGFiLW9yZy55bWw= 100644
--- a/gitlab-ci-config/dev-gitlab-org.yml
+++ b/gitlab-ci-config/dev-gitlab-org.yml
@@ -559,9 +559,6 @@
   image: "${BUILDER_IMAGE_REGISTRY}/ubuntu_20.04:${BUILDER_IMAGE_REVISION}"
   extends: .branch_template
 
-Debian-9-branch:
-  image: "${BUILDER_IMAGE_REGISTRY}/debian_9:${BUILDER_IMAGE_REVISION}"
-  <<: *branch_build
 Debian-10-branch:
   image: "${BUILDER_IMAGE_REGISTRY}/debian_10:${BUILDER_IMAGE_REVISION}"
   <<: *branch_build
@@ -791,9 +788,6 @@
   <<: *dev-tag-and-nightly
 
 ### Package builds
-Debian-9:
-  image: "${BUILDER_IMAGE_REGISTRY}/debian_9:${BUILDER_IMAGE_REVISION}"
-  <<: *tag_build
 Debian-10:
   image: "${BUILDER_IMAGE_REGISTRY}/debian_10:${BUILDER_IMAGE_REVISION}"
   <<: *tag_build
@@ -879,13 +873,6 @@
   retry: 1
 
 ### Staging uploads
-Debian-9-staging:
-  needs:
-    - job: Debian-9
-      optional: true
-    - job: Debian-9-branch
-      optional: true
-  <<: *staging_upload
 Debian-10-staging:
   needs:
     - job: Debian-10
@@ -1021,10 +1008,6 @@
   needs:
     - Ubuntu-20.04-arm
   <<: *production_release
-Debian-9-release:
-  needs:
-    - Debian-9
-  <<: *production_release
 Debian-10-release:
   needs:
     - Debian-10
diff --git a/gitlab-ci-config/gitlab-com.yml b/gitlab-ci-config/gitlab-com.yml
index 1f366b692b4ec8ff80d7566c42361d45bc4eac14_Z2l0bGFiLWNpLWNvbmZpZy9naXRsYWItY29tLnltbA==..f1d32a07f0dc76a3786c3079c20abc53c2cca4c0_Z2l0bGFiLWNpLWNvbmZpZy9naXRsYWItY29tLnltbA== 100644
--- a/gitlab-ci-config/gitlab-com.yml
+++ b/gitlab-ci-config/gitlab-com.yml
@@ -402,7 +402,6 @@
 
 Centos 7 knapsack: *prepare_knapsack
 Centos 8 knapsack: *prepare_knapsack
-Debian 9 knapsack: *prepare_knapsack
 Debian 10 knapsack: *prepare_knapsack
 Debian 11 knapsack: *prepare_knapsack
 OpenSUSE 15.3 knapsack: *prepare_knapsack
@@ -442,12 +441,6 @@
   parallel: 6
   needs:
   - Ubuntu 20.04 knapsack
-Debian 9 specs :
-  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:omnibus-gitlab-stretch"
-  extends: .chef_spec_template
-  parallel: 6
-  needs:
-  - Debian 9 knapsack
 Debian 10 specs :
   image: "registry.gitlab.com/gitlab-org/gitlab-build-images:omnibus-gitlab-buster"
   extends: .chef_spec_template