diff --git a/.github/workflows/nix.yml b/.github/workflows/nix.yml
index 1920099..b1a9639 100644
--- a/.github/workflows/nix.yml
+++ b/.github/workflows/nix.yml
@@ -16,9 +16,8 @@ jobs:
       matrix:
         channel:
           - nixos-unstable
-          - nixos-21.05
-          - nixos-21.11
           - nixos-22.05
+          - nixos-22.11
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 28b97e4..f8e0990 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -3,13 +3,12 @@ stages:
 
 build:
   stage: build
-  image: nixpkgs/nix:nixos-21.11
+  image: nixpkgs/nix:nixos-22.05
   script: nix-shell --run ./ci.sh
   parallel:
     matrix:
       - NIXPKGS_CHANNEL: nixos-unstable
         IMAGE_TAG: latest
       - NIXPKGS_CHANNEL:
-          - nixos-21.05
-          - nixos-21.11
           - nixos-22.05
+          - nixos-22.11
diff --git a/README.md b/README.md
index 67dd0d9..92bacaf 100644
--- a/README.md
+++ b/README.md
@@ -39,10 +39,9 @@ nixpkgs channel describes.
 
 | Channel        | Image Tag   | Description                                       |
 | ---            | ---         | ---                                               |
-| nixos-unstable | latest      | latest and greatest, major versions might change  |
 | nixos-22.05    | nixos-22.05 | only minor versions that include security updates |
-| nixos-21.11    | nixos-21.11 | only minor versions that include security updates |
-| nixos-21.05    | nixos-21.05 | only minor versions that include security updates |
+| nixos-22.11    | nixos-22.11 | only minor versions that include security updates |
+| nixos-unstable | latest      | latest and greatest, major versions might change  |
 
 ## List of images