diff --git a/flake.nix b/flake.nix
index cfc240e..edfeb5d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -7,10 +7,10 @@
     mattermost-server.url = "github:mattermost/mattermost-server?ref=v6.7.2";
     mattermost-server.flake = false;
 
-    nixpkgs.url = "github:NixOS/nixpkgs?rev=df2bcbbd1c2aa144261cf1b0003c889c075dc693";
-    nixpkgs-unstable.url = "github:NixOS/nixpkgs?rev=ae1dc133ea5f1538d035af41e5ddbc2ebcb67b90";
-    nix-hexchen.url = "git+https://gitlab.com/hexchen/nixfiles?ref=main";
-    nixos-mailserver.url = "git+https://gitlab.com/simple-nixos-mailserver/nixos-mailserver?rev=f535d8123c4761b2ed8138f3d202ea710a334a1d";
+    nixpkgs.url = "nixpkgs/nixos-22.05";
+    nixpkgs-unstable.url = "nixpkgs/nixpkgs-unstable";
+    nix-hexchen.url = "gitlab:hexchen/nixfiles";
+    nixos-mailserver.url = "gitlab:simple-nixos-mailserver/nixos-mailserver/nixos-22.05";
 
     deploy-rs.url = "github:serokell/deploy-rs";
     deploy-rs.inputs.nixpkgs.follows = "nixpkgs";