diff --git a/tox.ini b/tox.ini
index a488133d..1bd32afe 100644
--- a/tox.ini
+++ b/tox.ini
@@ -30,6 +30,7 @@ deps =
     devdeps: git+https://github.com/astropy/astroscrappy.git#egg=astroscrappy
     devdeps: git+https://github.com/astropy/astroquery.git#egg=astroquery
     devdeps: git+https://github.com/astropy/photutils.git#egg=photutils
+    devdeps: git+https://github.com/PJ-Watson/sep-pjw.git#egg=sep-pjw
 
 extras =
     test