diff --git a/requirements.txt b/requirements.txt
index 88e45ef..0bf50c9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -45,7 +45,7 @@ pickleshare==0.7.4
 Pillow==5.1.0
 prometheus-client==0.3.1
 prompt-toolkit==1.0.15
-protobuf==3.6.0
+protobuf==3.15.0
 ptyprocess==0.6.0
 pydicom==1.1.0
 Pygments==2.2.0