diff --git a/requirements.txt b/requirements.txt
index 75b04d5..e9fcaa6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ idna==2.6
 Markdown==2.6.11
 matplotlib==2.1.2
 numpy==1.14.0
-protobuf==3.5.1
+protobuf==3.18.3
 pycparser==2.18
 pyparsing==2.2.0
 PyPDF2==1.26.0