diff --git a/flake.lock b/flake.lock
index c332d822..0cb8ebf6 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,17 +2,17 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1733881728,
-        "narHash": "sha256-E/NfKTNHvBBjBHdSv1Dgn5kRzJcymH/xgXZ3sGoHmV8=",
+        "lastModified": 1734014226,
+        "narHash": "sha256-RcDCLav9GZYWYGoPcU5LzDxrqdDO+a4UYg4pSDyfV9c=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "26baeceed3a5ab67791b1456ff710fe97b661639",
+        "rev": "0b04b1f3548f38d045f46821d8f41cab5680fed7",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "26baeceed3a5ab67791b1456ff710fe97b661639",
+        "rev": "0b04b1f3548f38d045f46821d8f41cab5680fed7",
         "type": "github"
       }
     },
diff --git a/flake.nix b/flake.nix
index a0acca18..708fb044 100644
--- a/flake.nix
+++ b/flake.nix
@@ -7,7 +7,7 @@
   };
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs?rev=26baeceed3a5ab67791b1456ff710fe97b661639";
+    nixpkgs.url = "github:NixOS/nixpkgs?rev=0b04b1f3548f38d045f46821d8f41cab5680fed7";
   };
 
   outputs = { self, nixpkgs }:
diff --git a/ocaml/default.nix b/ocaml/default.nix
index 25d9d5a6..49440a3c 100644
--- a/ocaml/default.nix
+++ b/ocaml/default.nix
@@ -2561,6 +2561,10 @@ with oself;
   timere = callPackage ./timere/default.nix { };
   timere-parse = callPackage ./timere/parse.nix { };
 
+  tls-eio =
+    if lib.versionAtLeast ocaml.version "5.0"
+    then osuper.tls-eio else null;
+
   torch = osuper.torch.overrideAttrs (o: {
     src = fetchFromGitHub {
       owner = "janestreet";
@@ -2675,15 +2679,6 @@ with oself;
     propagatedBuildInputs = [ uspf ];
   };
 
-  utop = osuper.utop.overrideAttrs (_: {
-    src = fetchFromGitHub {
-      owner = "ocaml-community";
-      repo = "utop";
-      rev = "2.15.0";
-      hash = "sha256-wfsMBx+2XPkgl+V2NCXBZ4X3wZa75bX7QnXsMrqysTw=";
-    };
-  });
-
   uutf = osuper.uutf.overrideAttrs (_: {
     pname = "uutf";
     patches = if isFlambda2 then [ ./uutf-locals.patch ] else [ ];
diff --git a/ocaml/ocaml5.nix b/ocaml/ocaml5.nix
index 817dcc95..37adc731 100644
--- a/ocaml/ocaml5.nix
+++ b/ocaml/ocaml5.nix
@@ -164,12 +164,6 @@ with oself;
     };
   };
 
-  tls-eio = buildDunePackage {
-    pname = "tls-eio";
-    inherit (tls) version src;
-    propagatedBuildInputs = [ tls mirage-crypto-rng mirage-crypto-rng-eio x509 eio ];
-  };
-
   wayland = osuper.wayland.overrideAttrs (o: {
     src = builtins.fetchurl {
       url = "https://github.com/talex5/ocaml-wayland/releases/download/v2.0/wayland-2.0.tbz";