diff --git a/MANIFEST.in b/MANIFEST.in
index 7ee5d82..9766345 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,2 +1,3 @@
 include petabtests/conversion.xml
-include petabtests/cases/*/*
+include petabtests/cases/sbml/*/*
+include petabtests/cases/pysb/*/*
diff --git a/petabtests/version.py b/petabtests/version.py
index b69015c..e75121a 100644
--- a/petabtests/version.py
+++ b/petabtests/version.py
@@ -1 +1 @@
-__version__ = '0.0.0a5'
+__version__ = '0.0.0a6'