diff --git a/requirements.txt b/requirements.txt
index 46e5c75..2cfae3e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -33,7 +33,7 @@ opt-einsum==3.1.0
 packaging==20.0
 Pillow==7.0.0
 pluggy==0.13.1
-protobuf==3.11.2
+protobuf==3.18.3
 py==1.8.1
 pyamg==4.0.0
 pyasn1==0.4.8