diff --git a/pkgs/development/python-modules/weaviate-client/default.nix b/pkgs/development/python-modules/weaviate-client/default.nix
index 73d651221567..7718af4e9d60 100644
--- a/pkgs/development/python-modules/weaviate-client/default.nix
+++ b/pkgs/development/python-modules/weaviate-client/default.nix
@@ -43,6 +43,7 @@ buildPythonPackage rec {
     "httpx"
     "validators"
     "authlib"
+    "protobuf"
   ];
 
   build-system = [ setuptools-scm ];