diff --git a/requirements.txt b/requirements.txt
index e505bb4..72f967e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -34,7 +34,7 @@ Pillow==4.3.0
 pkg-resources==0.0.0
 ply==3.10
 prompt-toolkit==1.0.15
-protobuf==3.5.0.post1
+protobuf==3.15.0
 ptyprocess==0.5.2
 Pygments==2.2.0
 pyparsing==2.2.0