diff --git a/Pipfile b/Pipfile
index 2403c06..a3b0166 100644
--- a/Pipfile
+++ b/Pipfile
@@ -10,3 +10,7 @@ httpx = "==0.13.3"
 coveralls = "*"
 "pytest-watch" = "*"
 "pytest-testmon" = "*"
+
+[requires]
+
+python_version = ">=3.6"
diff --git a/setup.py b/setup.py
index c80e84e..a3fe64c 100644
--- a/setup.py
+++ b/setup.py
@@ -60,6 +60,7 @@ def install():
         install_requires=[
             'httpx==0.13.3',
         ],
+        python_requires= '>=3.6',
         tests_require=[
             'pytest',
             'coveralls',