diff --git a/Makefile b/Makefile
index 8ea63c0f895..ebcb528204a 100644
--- a/Makefile
+++ b/Makefile
@@ -74,9 +74,10 @@ install-ocamlformat:
 dev-depext:
 	opam depext -y $(TEST_DEPS)
 
+# v4-414-dev
 .PHONY: melange
 melange:
-	opam pin add -n melange.dev https://github.com/melange-re/melange.git#v4-414-dev
+	opam pin add -n melange.dev https://github.com/melange-re/melange.git#24e21cc42
 
 .PHONY: dev-deps
 dev-deps: melange
diff --git a/flake.lock b/flake.lock
index 6e7b356c3ba..3dc295fee17 100644
--- a/flake.lock
+++ b/flake.lock
@@ -5,11 +5,11 @@
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1705309234,
-        "narHash": "sha256-uNRRNRKmJyCRC/8y1RqBkqWBLM034y4qN7EprSdmgyA=",
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "1ef2e671c3b0c19053962c07dbda38332dcebf26",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
         "type": "github"
       },
       "original": {
@@ -39,8 +39,8 @@
       },
       "original": {
         "owner": "melange-re",
-        "ref": "v4-414-dev",
         "repo": "melange",
+        "rev": "24e21cc4284ffb18b3a856c1d730f06f34d32737",
         "type": "github"
       }
     },
@@ -87,11 +87,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1708532945,
-        "narHash": "sha256-0KucnySzsz5Zgonjjm8cQMql+HGHa/OhB0fnKmGeD+0=",
+        "lastModified": 1715037484,
+        "narHash": "sha256-OUt8xQFmBU96Hmm4T9tOWTu4oCswCzoVl+pxSq/kiFc=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "ac4c5a60bebfb783f1106d126b9f39cc8e809e0e",
+        "rev": "ad7efee13e0d216bf29992311536fce1d3eefbef",
         "type": "github"
       },
       "original": {
@@ -111,11 +111,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1708563706,
-        "narHash": "sha256-9Mt5hD3W0hDyIcPos9anTFRW7RHjEg3+2inj6jOY2S4=",
+        "lastModified": 1713734511,
+        "narHash": "sha256-WytVDQJz0i3arHUDVSj+b/9/IQq/z9wBrkSeQDIZAgU=",
         "ref": "refs/heads/master",
-        "rev": "922a726d2dcd816263c34df7d8d0f44fd4700be2",
-        "revCount": 2062,
+        "rev": "e485128b11892dc1e6a17f28b687368f2ac0db32",
+        "revCount": 2067,
         "submodules": true,
         "type": "git",
         "url": "https://github.com/ocaml/ocaml-lsp"
diff --git a/flake.nix b/flake.nix
index 95b2fe58f18..28959f38dd9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -9,7 +9,7 @@
     };
     melange = {
       # When moving the compiler tests to OCaml 5.1, change to v4-51-dev
-      url = "github:melange-re/melange/v4-414-dev";
+      url = "github:melange-re/melange?rev=24e21cc4284ffb18b3a856c1d730f06f34d32737";
       inputs.nixpkgs.follows = "nixpkgs";
       inputs.flake-utils.follows = "flake-utils";
     };