diff --git a/setup.cfg b/setup.cfg
index a3e84ca..9bdc1d5 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -2,4 +2,3 @@
 license_file = LICENSE
 
 [bdist_wheel]
-universal=1
diff --git a/setup.py b/setup.py
index e02dec6..bbe3a33 100644
--- a/setup.py
+++ b/setup.py
@@ -43,6 +43,7 @@ setup(
     license="BSD License",
     packages=["anymail"],
     zip_safe=False,
+    python_requires='>=3.5',
     install_requires=["django>=2.0", "requests>=2.4.3"],
     extras_require={
         # This can be used if particular backends have unique dependencies.