diff --git a/setup.cfg b/setup.cfg
index 670ae3f..ec56bbe 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -3,7 +3,7 @@
 
 [metadata]
 name = de.p1st.exec_notify
-version = 0.1.7
+version = 0.1.8
 author = Daniel Langbein
 author_email = daniel@systemli.org
 description = mail notification if command fails
@@ -24,7 +24,9 @@ classifiers =
 package_dir =
     = src
 packages = find:
-python_requires = >=3.6.9
+; capture_output was added in 3.7
+; - https://docs.python.org/3/library/subprocess.html#subprocess.run
+python_requires = >=3.7
 
 [options.packages.find]
 where = src
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 0abbd0a..0000000
--- a/setup.py
+++ /dev/null
@@ -1,4 +0,0 @@
-# This file is required for `pip install` on Ubuntu 18.04.
-# It loads `setup.cfg`.
-from setuptools import setup
-setup()