diff --git a/requirements.txt b/requirements.txt
index a7afffa..48b9639 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -47,7 +47,7 @@ Pillow==5.2.0
 pluggy==0.7.1
 prometheus-client==0.3.1
 prompt-toolkit==1.0.15
-protobuf==3.5.2
+protobuf==3.15.0
 ptyprocess==0.6.0
 py==1.5.4
 Pygments==2.2.0