diff --git a/requirements.txt b/requirements.txt
index 005fdad..5f6a111 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ itsdangerous==1.1.0
 Jinja2==2.10.1
 MarkupSafe==1.1.1
 Pillow==6.0.0
-protobuf==3.7.1
+protobuf==3.18.3
 pyasn1==0.4.5
 pyasn1-modules==0.2.5
 pysrt==1.1.1