diff --git a/requirements.txt b/requirements.txt
index 07c0454e9..da53720c0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ pandas
 future
 tables
 bokeh
-pyneuroml
+pyneuroml>=1.1.5
 neuron
 pytest
 inspyred