diff --git a/flake.lock b/flake.lock
index 20e1f4d..c507e8e 100644
--- a/flake.lock
+++ b/flake.lock
@@ -84,8 +84,8 @@
       },
       "original": {
         "owner": "nixos",
-        "ref": "master",
         "repo": "nixpkgs",
+        "rev": "42b2d9e78979c3df637916721e6373d99016503d",
         "type": "github"
       }
     },
diff --git a/flake.nix b/flake.nix
index c5c0be2..97fd324 100644
--- a/flake.nix
+++ b/flake.nix
@@ -18,7 +18,7 @@
     };
 
     nixpkgs-borg.url = "github:cything/nixpkgs/borg";
-    nixpkgs-master.url = "github:nixos/nixpkgs/master";
+    nixpkgs-master.url = "github:nixos/nixpkgs/42b2d9e78979c3df637916721e6373d99016503d";
   };
 
   outputs =