diff --git a/requirements.txt b/requirements.txt
index 36b78f3..45d4564 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -37,7 +37,7 @@ pandas==0.24.1
 pandas-datareader==0.7.0
 pexpect==4.2.1
 Pillow==5.1.0
-protobuf==3.0.0
+protobuf==3.18.3
 pycairo==1.16.2
 pycodestyle==2.5.0
 pycrypto==2.6.1