diff --git a/setup.py b/setup.py
index ff52eef9c9..dc91eef264 100644
--- a/setup.py
+++ b/setup.py
@@ -81,7 +81,7 @@
         "ldap3>=2.8,<2.10",
         "msgpack>=1.0.0, <1.1.0",
         "passlib>=1.6.5, <1.8",
-        "protobuf>=3.14,<3.19",
+        "protobuf>=3.14,<=3.19",
         "pyOpenSSL>=20.0,<21.1",
         "pyparsing>=2.4.2,<2.5",
         "pyperclip>=1.6.0,<1.9",