diff --git a/requirements.txt b/requirements.txt
index e350d276..94ee9290 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 beautifulsoup4  ==4.8.0
 cryptography    ==2.7
-dataclasses     ==0.6
+dataclasses     ==0.6;python_version<'3.7'
 dnspython       ==1.16.0
 feedparser      ==5.2.1
 html5lib        ==1.0.1