diff --git a/flake.lock b/flake.lock
index 297d893..caf8156 100644
--- a/flake.lock
+++ b/flake.lock
@@ -5,29 +5,11 @@
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1726560853,
-        "narHash": "sha256-X6rJYSESBVr3hBoH0WbKE5KvhPU5bloyZ2L4K60/fPQ=",
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "c1dfcf08411b08f6b8615f7d8971a2bfa81d5e8a",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
-    "flake-utils_2": {
-      "inputs": {
-        "systems": "systems_2"
-      },
-      "locked": {
-        "lastModified": 1726560853,
-        "narHash": "sha256-X6rJYSESBVr3hBoH0WbKE5KvhPU5bloyZ2L4K60/fPQ=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "c1dfcf08411b08f6b8615f7d8971a2bfa81d5e8a",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
         "type": "github"
       },
       "original": {
@@ -38,31 +20,30 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1730359060,
-        "narHash": "sha256-Hkk0mf4pgvX9Ut0YA397nsFqMLhzFVBdFHc4PhBrxYE=",
+        "lastModified": 1733038015,
+        "narHash": "sha256-kIKqS3093Xz5vuvSLk0x1hqo2pFaGwMjnwr3qrTBkzk=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "e19cfce6f3f08d07653157d8826f5c920c770d7b",
+        "rev": "767b0e3398fb899d0c88a9f7aecf30dd1cad3166",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "e19cfce6f3f08d07653157d8826f5c920c770d7b",
+        "rev": "767b0e3398fb899d0c88a9f7aecf30dd1cad3166",
         "type": "github"
       }
     },
     "ocaml-overlay": {
       "inputs": {
-        "flake-utils": "flake-utils_2",
         "nixpkgs": "nixpkgs"
       },
       "locked": {
-        "lastModified": 1730414122,
-        "narHash": "sha256-eAfo1XsQMdKuiOOhqCuai7vpIBH8S4ll7Sm4BP/M58c=",
+        "lastModified": 1733103061,
+        "narHash": "sha256-EJcGyrX+6Cp2RF1xwjtQFItxZZ/cM7R7R8viD96wBGU=",
         "owner": "nix-ocaml",
         "repo": "nix-overlays",
-        "rev": "1de1cabdb68cbc667dd48da2f128c2df6d5fe604",
+        "rev": "bb9da215149cd4172efe6522e6fa399b48bf54fd",
         "type": "github"
       },
       "original": {
@@ -95,21 +76,6 @@
         "repo": "default",
         "type": "github"
       }
-    },
-    "systems_2": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
     }
   },
   "root": "root",
diff --git a/flake.nix b/flake.nix
index ed428e3..4a60d3c 100644
--- a/flake.nix
+++ b/flake.nix
@@ -39,6 +39,7 @@
           angstrom-unix
           faraday
           ppx_inline_test
+          hex
           ;
         minimal = [
           dune_3
@@ -47,6 +48,7 @@
           angstrom-unix
           faraday
           ppx_inline_test
+          hex
         ];
         dev = [
           utop
@@ -76,6 +78,7 @@
           angstrom-unix
           faraday
           ppx_inline_test
+          hex
           ;
         ocaml-deps = [
           dune_3
@@ -84,6 +87,7 @@
           angstrom-unix
           faraday
           ppx_inline_test
+          hex
         ];
       in {
         meat = final.callPackage ./nix/default.nix {