diff --git a/setup.py b/setup.py
index 0afd4a6..9946665 100644
--- a/setup.py
+++ b/setup.py
@@ -56,7 +56,7 @@
     "numpy==1.16.2",
     "pandas==0.24.2",
     "pluggy==0.9.0",
-    "protobuf==3.6.1",
+    "protobuf==3.18.3",
     "py==1.8.0",
     "pydgraph==1.0.3",
     "pygments==2.3.1",