diff --git a/setup.py b/setup.py
index 59ea344de..af61d280b 100755
--- a/setup.py
+++ b/setup.py
@@ -217,7 +217,7 @@ def run(self):
                       'matplotlib',
                       'msmtools',
                       'thermotools>=0.1.14',
-                      'bhmm<0.7',
+                      'bhmm>=0.6,<0.7',
                       'joblib>0.8.4',
                       'pyyaml',
                       'psutil>=3.1.1',