diff --git a/ristretto/requirements.txt b/ristretto/requirements.txt
index 56deada..4e069df 100644
--- a/ristretto/requirements.txt
+++ b/ristretto/requirements.txt
@@ -26,7 +26,7 @@ pickleshare==0.7.4
 Pillow==6.2.0
 plotly==2.0.8
 prompt-toolkit==1.0.14
-protobuf==3.2.0
+protobuf==3.15.0
 ptyprocess==0.5.1
 pydot==1.2.3
 Pygments==2.2.0