diff --git a/pkgs/by-name/ta/tagutil/package.nix b/pkgs/by-name/ta/tagutil/package.nix
index cdd6b7901d66..b39aaeecde2e 100644
--- a/pkgs/by-name/ta/tagutil/package.nix
+++ b/pkgs/by-name/ta/tagutil/package.nix
@@ -13,13 +13,13 @@
 
 stdenv.mkDerivation rec {
   pname = "tagutil";
-  version = "3.1";
+  version = "3.1-unstable-2025-06-16";
 
   src = fetchFromGitHub {
     owner = "kaworu";
     repo = "tagutil";
-    rev = "v${version}";
-    sha256 = "sha256-oY1aGl5CKVtpOfh8Wskio/huWYMiPuxWPqxlooTutcw=";
+    rev = "c8b20ef350b1a8a67a747590e2e88b41f802cce4";
+    sha256 = "sha256-sKnBS9kXhJ2atN6A3qcX9A+0A7WfNkOe+nKSblL3i0o=";
   };
 
   sourceRoot = "${src.name}/src";