diff --git a/github_issue_summarization/requirements.txt b/github_issue_summarization/requirements.txt
index aae2fe5c..f0c8ab61 100644
--- a/github_issue_summarization/requirements.txt
+++ b/github_issue_summarization/requirements.txt
@@ -142,7 +142,7 @@ pox==0.2.3
 ppft==1.6.4.7.1
 preshed==1.0.0
 prompt-toolkit==1.0.15
-protobuf==3.5.0
+protobuf==3.15.0
 psutil==5.2.2
 ptyprocess==0.5.2
 py==1.4.34