diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 7b3dc09d69dc3671808000a1d8015a2f7a9fcfab..109e31a46caecc5a2a390a9ecf98b58e154e92ab 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -8,7 +8,7 @@ variables:
   NIX_STORE_CACHE_PATH: ".ci_nix_cache"
 
 default:
-  image: nixos/nix:2.20.1
+  image: nixos/nix:2.21.2
   interruptible: true
   tags: [ fp ]