diff --git a/src/requirements.txt b/src/requirements.txt
index 0d764a7..e6caf94 100644
--- a/src/requirements.txt
+++ b/src/requirements.txt
@@ -18,8 +18,8 @@ numpy==1.12.0
 olefile==0.44
 packaging==16.8
 pbr==2.0.0
+protobuf==3.18.3
 Pillow==9.3.0
-protobuf==3.0.0b2
 pyparsing==2.1.10
 python-dateutil==2.6.0
 pytz==2016.10