diff --git a/pyproject.toml b/pyproject.toml
index c69024c..ae215c1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,7 +20,7 @@ classifiers = [
 dependencies = [
   "grpcio==1.76.0",
   "grpcio-reflection==1.*",
-  "protobuf==6.33.0", # Must be compatible with grpcio-tools.
+  "protobuf==6.33.1", # Must be compatible with grpcio-tools.
   "pydantic==2.*",
   "structlog==25.*",
 ]