diff --git a/setup.py b/setup.py
index 636aa41..9b85a59 100644
--- a/setup.py
+++ b/setup.py
@@ -29,9 +29,9 @@
         "dnaplotlib",
         "biopython",
         "reportlab",
-        "tesbml",
         "nbgitpuller",
         "tellurium",
     ],
+    extras_requirements={'sbml': ['tesbml']}, 
     include_package_data=True,
 )