diff --git a/pkgs/by-name/h2/h2o/package.nix b/pkgs/by-name/h2/h2o/package.nix
index 3f19ff1e2b0b..e13075fd3862 100644
--- a/pkgs/by-name/h2/h2o/package.nix
+++ b/pkgs/by-name/h2/h2o/package.nix
@@ -23,13 +23,13 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "h2o";
-  version = "2.3.0.20250717";
+  version = "2.3.0-untagged-2025-08-14";
 
   src = fetchFromGitHub {
     owner = "h2o";
     repo = "h2o";
-    rev = "db98b59ba7abfcd1dc9b43ea4b9ad1052aba775e";
-    sha256 = "sha256-vBA5TWyvtaaBZV4RmfAAA7F34fXNkROS0rbZRpEJgrc=";
+    rev = "ffab9c49c33b1f0e9aec9804028156aae9db8ef0";
+    hash = "sha256-kdU2p9oUhxGnw8JU9qGjV4mn2jMeSUL0rLgveMs6NiI=";
   };
 
   outputs = [