diff --git a/ci-tools/update-nixpkgs b/ci-tools/update-nixpkgs
index d4afb21ff9689bd599d1d0fd2ca08089f8767d87..5d02c8a4b72490b58388a2d1f138a7320299792b 100755
--- a/ci-tools/update-nixpkgs
+++ b/ci-tools/update-nixpkgs
@@ -1,8 +1,7 @@
 #!/usr/bin/env nix-shell
-#!nix-shell -i bash -p nixUnstable git curl python3
+#!nix-shell -i bash -p git curl python3
 
 # ^^
-# we get nixUnstable for the diff-closures command, mostly.
 # we need git to commit and push our changes
 # we need curl to create the gitlab MR
 # we need python to format the data as json