diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c8f062cc2..11730ce19 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -44,7 +44,7 @@ node modules:
         - .npm
         - node_modules
   script:
-    - "nix shell .#gnumake .#gup .#nodejs-14_x --command make node_modules"
+    - make node_modules
   before_script: &nix-before
     - git config --global init.defaultBranch master
     # - install -v -m 0700 -d ~/.ssh
@@ -65,7 +65,7 @@ node modules:
 well-known:
   stage: setup
   script:
-    - "nix shell .#gnumake .#nodejs-14_x .#exiftool --command make well-known"
+    - make well-known
   before_script: *nix-before
   needs:
     - job: node modules
@@ -93,9 +93,7 @@ backend dependencies:
         - .stack
         - .stack-work
   script:
-    - "nix shell .#gnumake .#stack .#coreutils .#prepare-env --command sh -c 'prepare-env && make backend-dependencies'" # TODO maybe remove prepare-env
-    - "ls -a ." # TODO: debug only
-    - "ls -a ${HOME}/.stack"
+    - make backend-dependencies
   before_script: *nix-before
   artifacts:
     paths:
@@ -110,7 +108,7 @@ backend dependencies:
 frontend lint:
   stage: lint
   script:
-    - "nix shell .#gnumake .#nodejs-14_x --command make frontend-lint"
+    - make frontend-lint
   before_script: *nix-before
   cache:
     - *frontend-cache
@@ -127,8 +125,7 @@ backend lint:
   cache:
     - *stack-cache
   script:
-    - "ls -a ." # TODO: debug only
-    - "nix shell .#gnumake .#stack .#tzdata --command 'prepare-env && make backend-lint-prod'"
+    - make backend-lint-prod
   before_script: *nix-before
   needs:
     - job: backend dependencies
@@ -142,7 +139,7 @@ frontend build:
   cache:
     - *frontend-cache
   script:
-    - "nix shell .#gnumake .#nodejs-14_x --command make frontend-build"
+    - make frontend-build
   before_script: *nix-before
   needs:
     - job: node modules
@@ -166,7 +163,7 @@ backend build:
   cache:
     - *stack-cache
   script:
-    - nix shell .#gnumake .#coreutils .#stack .#tzdata --command "prepare-env && make bin/uniworx"
+    - make bin/uniworx
     - cp $(stack path --dist-dir)/build/hlint/hlint bin/test-hlint
     - cp $(stack path --dist-dir)/build/yesod/yesod bin/test-yesod
   before_script: *nix-before
@@ -195,7 +192,7 @@ backend build:
 uniworxdb:
   stage: build
   script:
-    - nix shell .#gnumake .#coreutils .#stack .#tzdata --command "prepare-env && make bin/uniworxdb"
+    - make bin/uniworxdb
   before_script: *nix-before
   needs:
     - job: node modules # transitive
@@ -249,7 +246,7 @@ uniworx:exe:uniworxload:
 frontend test:
   stage: test
   script:
-    - nix shell .#gnumake .#nodejs-14_x .#chromium .#tzdata --command "prepare-env && make frontend-test"
+    - make frontend-test
   before_script: *nix-before
   cache: *frontend-cache
   needs: