diff --git a/pkgs/development/python-modules/google-cloud-iam/default.nix b/pkgs/development/python-modules/google-cloud-iam/default.nix
index 21e96f3e9aa9..a519eee42309 100644
--- a/pkgs/development/python-modules/google-cloud-iam/default.nix
+++ b/pkgs/development/python-modules/google-cloud-iam/default.nix
@@ -17,14 +17,14 @@
 
 buildPythonPackage rec {
   pname = "google-cloud-iam";
-  version = "3.31.3";
+  version = "2.19.0";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "googleapis";
     repo = "google-cloud-python";
-    tag = "google-cloud-build-v${version}";
-    hash = "sha256-qQ+8X6I8lt4OTgbvODsbdab2dYUk0wxWsbaVT2T651U=";
+    tag = "google-cloud-iam-v${version}";
+    hash = "sha256-E1LISOLQcXqUMTTPLR+lwkR6gF1fuGGB44j38cIK/Z4=";
   };
 
   sourceRoot = "${src.name}/packages/google-cloud-iam";
@@ -57,8 +57,12 @@ buildPythonPackage rec {
     "google.cloud.iam_credentials_v1"
   ];
 
-  passthru.updateScript = gitUpdater {
-    rev-prefix = "google-cloud-iam-v";
+  passthru = {
+    # bulk updater selects wrong tag
+    skipBulkUpdate = true;
+    updateScript = gitUpdater {
+      rev-prefix = "google-cloud-iam-v";
+    };
   };
 
   meta = {