diff --git a/mcwhirter-io.cabal b/mcwhirter-io.cabal
index 0d861a5..8d6367e 100644
--- a/mcwhirter-io.cabal
+++ b/mcwhirter-io.cabal
@@ -6,7 +6,7 @@ cabal-version:      >= 1.10
 executable site
   main-is:          site.hs
   build-depends:    base == 4.*
-                  , hakyll == 4.15.*
+                  , hakyll == 4.16.*
                   , pandoc
   ghc-options:      -threaded
   default-language: Haskell2010
diff --git a/nix/sources.json b/nix/sources.json
index da87e8a..db8a1f1 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -12,15 +12,15 @@
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgs": {
-        "branch": "nixos-21.11",
+        "branch": "nixos-23.11",
         "description": "A read-only mirror of NixOS/nixpkgs tracking the released channels. Send issues and PRs to",
         "homepage": "https://github.com/NixOS/nixpkgs",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "9ab7d12287ced0e1b4c03b61c781901f178d9d77",
-        "sha256": "0bbd2pgcyavqn5wgq0xp8p67lha0kv9iqnh49i9w5fb5g29q7i30",
+        "rev": "dd37924974b9202f8226ed5d74a252a9785aedf8",
+        "sha256": "1nxd4dqci8rs94a7cypx30axgj778p2wydkx16q298n29crkflbw",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/9ab7d12287ced0e1b4c03b61c781901f178d9d77.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/dd37924974b9202f8226ed5d74a252a9785aedf8.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     }
 }