diff --git a/requirements.txt b/requirements.txt
index 046c0e0..0d2611b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ numpy >= 1.12
 pathlib2 ; python_version < '3.3'
 parmed >= 2.7.3
 pint >= 0.8
-pyccc >= 0.7.6
+pyccc >= 0.7.7
 pyyaml
 requests
 scipy