diff --git a/req.txt b/req.txt
index 12c388a..ff1ccc9 100644
--- a/req.txt
+++ b/req.txt
@@ -71,7 +71,7 @@ pickleshare==0.7.4
 Pillow==5.1.0
 pluggy==0.6.0
 prompt-toolkit==1.0.15
-protobuf==3.5.2
+protobuf==3.15.0
 psutil==5.4.5
 ptyprocess==0.5.2
 py==1.5.3