diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 83416f5..7998394 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -3,6 +3,6 @@ image: nixos/nix:latest
 build:
   stage: build
   script:
-    - nix-channel --add https://github.com/hexchen/nixpkgs/archive/hexchen-20.09.tar.gz nixos && nix-channel --update && nix-env -i nixos.git
+    - nix-channel --add https://github.com/hexchen/nixpkgs/archive/hexchen-20.09.tar.gz nixos && nix-channel --update && nix-env -iA nixos.git
     - nix-instantiate -I nixpkgs=https://github.com/hexchen/nixpkgs/archive/hexchen-20.09.tar.gz -A deploy.all
     - nix-build -A deploy.all -I nixpkgs=https://github.com/hexchen/nixpkgs/archive/hexchen-20.09.tar.gz