diff --git a/flake.lock b/flake.lock
index 444c096..2f283d8 100644
--- a/flake.lock
+++ b/flake.lock
@@ -20,17 +20,17 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1733335574,
-        "narHash": "sha256-F2lOx7b5kTO088Eq2wnb8UZo+S/RGpegObyhf1dEhD0=",
+        "lastModified": 1733132332,
+        "narHash": "sha256-8DTh3irBPko0ooHaeGJ5kPwBD8mOwiMX4eBjFuicLsA=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "f1a18363305d2314cd9994d22fc13497916aced7",
+        "rev": "b9ffe0d2ef589f4d75a62f908f00dfd6344b6b6e",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "f1a18363305d2314cd9994d22fc13497916aced7",
+        "rev": "b9ffe0d2ef589f4d75a62f908f00dfd6344b6b6e",
         "type": "github"
       }
     },
@@ -39,16 +39,17 @@
         "nixpkgs": "nixpkgs"
       },
       "locked": {
-        "lastModified": 1733352979,
-        "narHash": "sha256-QQhZgADZ2IYXjl9BiCWajOB0KXKzhhS4zrlgu71tqBU=",
+        "lastModified": 1733178998,
+        "narHash": "sha256-VfkaWyw578enSEYmPK+eocxTX0jSyr62EZucHMipcS0=",
         "owner": "nix-ocaml",
         "repo": "nix-overlays",
-        "rev": "2680def9838fc1bdc36540f3db2ad666e70fb016",
+        "rev": "274761cacd971c2570516141e854ccd9184fab24",
         "type": "github"
       },
       "original": {
         "owner": "nix-ocaml",
         "repo": "nix-overlays",
+        "rev": "274761cacd971c2570516141e854ccd9184fab24",
         "type": "github"
       }
     },
diff --git a/flake.nix b/flake.nix
index 60c258e..9877163 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,7 +3,7 @@
     # nixpkgs.url = "github:nixOS/nixpkgs";
     nixpkgs.follows = "ocaml-overlay/nixpkgs";
     ocaml-overlay = {
-      url = "github:nix-ocaml/nix-overlays";
+      url = "github:nix-ocaml/nix-overlays?rev=274761cacd971c2570516141e854ccd9184fab24";
     };
     flake-utils.url = "github:numtide/flake-utils";
   };