diff --git a/pkgs/development/tools/gir/default.nix b/pkgs/development/tools/gir/default.nix
index c88ffef4df1..856cd44e26c 100644
--- a/pkgs/development/tools/gir/default.nix
+++ b/pkgs/development/tools/gir/default.nix
@@ -2,16 +2,17 @@
 
 rustPlatform.buildRustPackage rec {
   pname = "gir";
-  version = "2019-10-16";
+  version = "unstable-2021-05-05";
 
   src = fetchFromGitHub {
     owner = "gtk-rs";
     repo = "gir";
-    rev = "241d790085a712db7436c5c25b210ccb7d1a08d5";
-    sha256 = "1kn5kgdma9j6dwpmv6jmydak7ajlgdkw9sfkh3q7h8c2a8yikvxr";
+    rev = "c148542ce89b0bf7cbb9f5ef4179c96a45d022df";
+    sha256 = "0vy366ipwnn0cpp14l1v5g3dpnsr3hd8mjp3333lp0946igfqsy5";
+    leaveDotGit = true; # required for build.rs
   };
 
-  cargoSha256 = "048qhlc4f5khxi7dnakgqkhgww44r6h3mlx2fm7y2wqivr3rj8p1";
+  cargoSha256 = "11as1v88zf0f7l2ngllg5zqycvd05nb4vrsyl1dlarjvbq7fhvv8";
 
   meta = with lib; {
     description = "Tool to generate rust bindings and user API for glib-based libraries";