diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 382bdde..70a9ad5 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [21.x]
+        node-version: [20.x]
 
     steps:
     - uses: actions/checkout@v2
diff --git a/shell.nix b/shell.nix
index 9223c37..7b98df2 100644
--- a/shell.nix
+++ b/shell.nix
@@ -10,7 +10,7 @@ in
     packages = [
       pkgs.which
       pkgs.vscode # export NIXPKGS_ALLOW_UNFREE=1
-      pkgs.nodejs_21
+      pkgs.nodejs_20
     ];
     
     # Shell environments