diff --git a/requirements.txt b/requirements.txt
index 16dbb67..03d390a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -45,7 +45,7 @@ opencv-python==4.1.1.26
 opt-einsum==3.1.0
 packaging==19.2
 pluggy==0.13.0
-protobuf==3.6.1
+protobuf==3.18.3
 py==1.8.0
 pycosat==0.6.3
 pycparser==2.19