diff --git a/flake.nix b/flake.nix
index 29dbce1..1e6858a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,7 +2,7 @@
   description = "mkRuby to build a version of Ruby";
 
   inputs.flake-utils.url = "github:numtide/flake-utils";
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11";
   inputs.flake-compat.url = "github:edolstra/flake-compat";
   inputs.flake-compat.flake = false;
 
diff --git a/template/flake.nix b/template/flake.nix
index 15cbf89..602eb29 100644
--- a/template/flake.nix
+++ b/template/flake.nix
@@ -1,6 +1,6 @@
 {
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11";
     nixpkgs-ruby.url = "github:bobvanderlinden/nixpkgs-ruby";
     nixpkgs-ruby.inputs.nixpkgs.follows = "nixpkgs";
     flake-utils.url = "github:numtide/flake-utils";