diff --git a/legacy/openCV/requirements.txt b/legacy/openCV/requirements.txt
index e709f4f..2372833 100644
--- a/legacy/openCV/requirements.txt
+++ b/legacy/openCV/requirements.txt
@@ -39,7 +39,7 @@ pexpect==4.6.0
 pickleshare==0.7.5
 prometheus-client==0.4.2
 prompt-toolkit==2.0.6
-protobuf==3.6.1
+protobuf==3.15.0
 ptyprocess==0.6.0
 Pygments==2.2.0
 pyparsing==2.2.2