diff --git a/setup.py b/setup.py
index 8a473cf..e375d1f 100644
--- a/setup.py
+++ b/setup.py
@@ -28,7 +28,7 @@ def read(*parts):
 install_requires = [
     "click==7.1.*",
     "graphviz>=0.14,<0.17",
-    "protobuf==3.13.*"
+    "protobuf>=3.13,<3.16"
 ]
 
 setup_requires = [