diff --git a/flake.lock b/flake.lock
index d691282d7..3078f2490 100644
--- a/flake.lock
+++ b/flake.lock
@@ -20,17 +20,17 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1711001935,
-        "narHash": "sha256-URtGpHue7HHZK0mrHnSf8wJ6OmMKYSsoLmJybrOLFSQ=",
+        "lastModified": 1711046160,
+        "narHash": "sha256-Tg796U94ArTKw6c1AKWhxTREHgOzrCaC9kUS+mtrD+k=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "20f77aa09916374aa3141cbc605c955626762c9a",
+        "rev": "9b1635f1e7507a82f36c12a1534fafaa1b52d3ee",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "20f77aa09916374aa3141cbc605c955626762c9a",
+        "rev": "9b1635f1e7507a82f36c12a1534fafaa1b52d3ee",
         "type": "github"
       }
     },
diff --git a/flake.nix b/flake.nix
index 792ccd3d5..c87df9a91 100644
--- a/flake.nix
+++ b/flake.nix
@@ -7,7 +7,7 @@
   };
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs?rev=20f77aa09916374aa3141cbc605c955626762c9a";
+    nixpkgs.url = "github:NixOS/nixpkgs?rev=9b1635f1e7507a82f36c12a1534fafaa1b52d3ee";
     flake-utils.url = "github:numtide/flake-utils";
   };
 
diff --git a/ocaml/default.nix b/ocaml/default.nix
index b7073ec61..7630e06e1 100644
--- a/ocaml/default.nix
+++ b/ocaml/default.nix
@@ -1208,10 +1208,6 @@ with oself;
   matrix-stos = callPackage ./matrix/stos.nix { };
 
   mdx = osuper.mdx.overrideAttrs (o: {
-    src = builtins.fetchurl {
-      url = https://github.com/realworldocaml/mdx/releases/download/2.4.1/mdx-2.4.1.tbz;
-      sha256 = "04xg282dv9xrpcvav4fckrsxnfwmai1l73f9405fsgamrj8wqh0s";
-    };
     propagatedBuildInputs = o.propagatedBuildInputs ++ [ result cmdliner ];
   });