diff --git a/cs231n/assignment3/requirements.txt b/cs231n/assignment3/requirements.txt
index 8273b61..ac35fe2 100644
--- a/cs231n/assignment3/requirements.txt
+++ b/cs231n/assignment3/requirements.txt
@@ -46,7 +46,7 @@ path.py==8.1.2
 pexpect==4.0.1
 pickleshare==0.5
 Pillow==5.1.0
-protobuf==3.5.2.post1
+protobuf==3.15.0
 ptyprocess==0.5
 Pygments==2.0.2
 pyparsing==2.0.7