diff --git a/setup.py b/setup.py
index 6c3fec0..903a907 100644
--- a/setup.py
+++ b/setup.py
@@ -36,7 +36,7 @@
     "osmnx==0.8.1",
     "pandas==0.23.4",
     "pcst-fast==1.0.7",
-    "protobuf==3.3.0",
+    "protobuf==3.15.0",
     "py3-ortools==5.1.4041",
     "pybind11==2.2.3",
     "pycparser==2.18",