diff --git a/setup.py b/setup.py
index 5fcc21fa..9750296d 100644
--- a/setup.py
+++ b/setup.py
@@ -58,7 +58,7 @@ install_requires = [
     'inflection==0.3.1',
     'future==0.16.0',
     'boto3==1.4.8',
-    'acme==0.19.0',
+    'acme==0.20.0',
     'retrying==1.3.3',
     'tabulate==0.8.2',
     'pyOpenSSL==17.2.0',