diff --git a/requirements.txt b/requirements.txt
index 3b90ebd..76006a4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,3 @@
 pyaml==20.4.0
-docker==4.4.4
\ No newline at end of file
+docker==4.4.4
+six==1.16.0
\ No newline at end of file
diff --git a/setup.py b/setup.py
index f918dc7..c040194 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@ setup(
     license = "GPLv2",
     keywords = "docker yaml container",
     packages = find_packages(),
-    install_requires = ['pyaml>=17.12.1', 'docker>=3.4.1'],
+    install_requires = ['pyaml>=17.12.1', 'docker>=3.4.1','six>=1.16.0'],
     scripts = ['autocompose.py'],
     entry_points={
         'console_scripts': [