diff --git a/requirements.txt b/requirements.txt
index f9e86e0..e8702b8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -70,7 +70,7 @@ pickleshare==0.7.4
 Pillow==5.1.0
 plotly==3.1.1
 prompt-toolkit==1.0.15
-protobuf==3.6.0
+protobuf==3.18.3
 ptyprocess==0.5.2
 Pygments==2.2.0
 pymc3==3.4.1