diff --git a/default.nix b/default.nix
index 858f68a..5f207b3 100644
--- a/default.nix
+++ b/default.nix
@@ -3,9 +3,9 @@
 let
   # Pinned Nixpkgs for reproducibility
   nixpkgs = builtins.fetchTarball
-    { name   = "nixpkgs-22.11.b26d52c9feb";
-      url    = "https://github.com/nixos/nixpkgs/archive/b26d52c9feb.tar.gz";
-      sha256 = "1h2fnn64fx40v42ky8g89jpisjpsz7d2psb1v7jwb2n6rd5yl1ig";
+    { name   = "nixpkgs-23.05.5a237aecb572";
+      url    = "https://github.com/nixos/nixpkgs/archive/5a237aecb572.tar.gz";
+      sha256 = "166yxg4ff2jxvl9mbngd90dr1k3rdj6xmiccga41xynhh2zr0vmb";
     };
 
   # Needed for HTML manual