diff --git a/requirements.txt b/requirements.txt
index 44a23bb..0e9fa67 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,8 +1,8 @@
 requests>=2.27.0
-protobuf>=3.20.2
+protobuf==5.29.5
 setuptools>=68.0.0  # not directly required, pinned to avoid a vulnerability
 future>=0.18.3  # used in tests
 tox>=4.15.0
 wheel
 twine>=5.0.0
-setuptools_scm
\ No newline at end of file
+setuptools_scm