diff --git a/src/setup.py b/src/setup.py
index 48e3ca5..5ee4daf 100644
--- a/src/setup.py
+++ b/src/setup.py
@@ -22,6 +22,6 @@
     ),
     install_requires=[
         'z-quantum-core',
-        'forestopenfermion'
+        'forestopenfermion @ http://github.com/zapatacomputing/forest-openfermion/tarball/fast-op-conversion'
     ]
 )