diff --git a/.gitlab-ci/nix-bootstrap.conf b/.gitlab-ci/nix-bootstrap.conf
index 036c2fc5e..ad910db2c 100644
--- a/.gitlab-ci/nix-bootstrap.conf
+++ b/.gitlab-ci/nix-bootstrap.conf
@@ -1,5 +1,5 @@
 sandbox = true
-experimental-features = nix-command flakes ca-references
+experimental-features = nix-command flakes
 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
diff --git a/.gitlab-ci/nix.conf b/.gitlab-ci/nix.conf
index 29c91aba8..476e9d67c 100644
--- a/.gitlab-ci/nix.conf
+++ b/.gitlab-ci/nix.conf
@@ -1,5 +1,5 @@
 sandbox = true
-experimental-features = nix-command flakes ca-references
+experimental-features = nix-command flakes
 substituters = https://hydra.iohk.io https://cache.nixos.org/ s3://nix-cache?scheme=http&endpoint=minio-gitlab-runner-cache
 trusted-public-keys = hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= minio-gitlab-runner-cache:ZN5neq93MHqpnieHSBlxGgWvCL0WKrZ2S9QS+U5Bnro=
 require-sigs = true