diff --git a/nixpkgs.nix b/nixpkgs.nix
index 1c22faf..74ed372 100644
--- a/nixpkgs.nix
+++ b/nixpkgs.nix
@@ -7,6 +7,21 @@
 # The SHA256 will be printed as the last line of stdout.
 
 import (builtins.fetchTarball {
-    url    = "https://github.com/NixOS/nixpkgs/archive/dd9f73e7d34486b09b966738ace161e621a0480b.tar.gz";
-    sha256 = "0s674386v5b24a9fia26439gw9wsyhif85k2nzpxkp61293v3n3h";
+    # url    = "https://github.com/NixOS/nixpkgs/archive/dd9f73e7d34486b09b966738ace161e621a0480b.tar.gz";
+    # sha256 = "0s674386v5b24a9fia26439gw9wsyhif85k2nzpxkp61293v3n3h";
+    
+    
+    # nixos-22.05 at 2022-06-10
+    # url = "https://github.com/NixOS/nixpkgs/archive/e5556c75ac012ee6e03f39a56c1c51b0f7d658c2.tar.gz";
+    # sha256 = "00lrw73g0q7xl6mklr138zrjq4cpdk0cqk2py9nbz334v69acy3d";
+    
+    # release-22.05 at 2022-06-21
+    url = "https://github.com/NixOS/nixpkgs/archive/d2ff0167ce734340e745ca1f53b11a0996ff17a4.tar.gz";
+    sha256 = "sha256:1kk7ghmfxh1czgmr6j12al6m2sgh70zzm8dcddfjhbj5dcilfpgy";
   })
+
+# fetchTarball {
+#   # nixos-22.05 at 2022-06-10
+#   url = "https://github.com/NixOS/nixpkgs/archive/e5556c75ac012ee6e03f39a56c1c51b0f7d658c2.tar.gz";
+#   sha256 = "00lrw73g0q7xl6mklr138zrjq4cpdk0cqk2py9nbz334v69acy3d";
+# }