diff --git a/requirements.txt b/requirements.txt
index 99acc24..6c9bb42 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 cffi >= 0.8.0
-letsencrypt >= 0.5.0
+letsencrypt >= 0.7.0
 six>=1.7
 pyyaml>=3.11