diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 60c723369..3c12234f8 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -16,7 +16,7 @@ node dependencies:
   script:
     - nix build -o node-dependencies uniworxNodeDependencies
   before_script:
-    - nix-env -iA envsubst
+    - nix-env -f '<nixpkgs>' -iA envsubst
     - envsubst -i .gitlab-ci/nix.conf -o /etc/nix/nix.conf
   artifacts:
     paths:
diff --git a/.gitlab-ci/nix.conf b/.gitlab-ci/nix.conf
index 06af3c2d5..036c2fc5e 100644
--- a/.gitlab-ci/nix.conf
+++ b/.gitlab-ci/nix.conf
@@ -1 +1,5 @@
-sandbox = true
\ No newline at end of file
+sandbox = true
+experimental-features = nix-command flakes ca-references
+substituters = https://hydra.iohk.io https://cache.nixos.org/
+trusted-public-keys = hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
+require-sigs = true
\ No newline at end of file