diff --git a/setup.py b/setup.py
index 00370a3..08d5064 100644
--- a/setup.py
+++ b/setup.py
@@ -23,7 +23,7 @@ def readme():
         "larq>=0.9.2,<0.13.2",
         "zookeeper>=1.0.0",
         "typeguard<3.0.0",
-        "protobuf<3.21",
+        "protobuf<5.29",
         "importlib-metadata ~= 2.0 ; python_version<'3.8'",
     ],
     extras_require={