diff --git a/setup.cfg b/setup.cfg
index 517745a..2064dae 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -25,8 +25,8 @@ packages = find:
 include_package_data = True
 python_requires = >= 3.8
 install_requires =
-    pymodbus >= 3.5.0
-    pyserial-asyncio >= 0.6.0
+    pymodbus ~= 3.5.0
+    pyserial-asyncio ~= 0.6.0
 
 [options.packages.find]
 where = src