diff --git a/pyproject.toml b/pyproject.toml
index 4a69171..9e47403 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,7 +36,8 @@ docs = [
 ]
 test = [
     'pytest',
-    'asdf-astropy >= 0.2.0'
+    #'asdf-astropy >= 0.2.0'
+    'asdf-astropy @ git+https://github.com/braingram/asdf-astropy.git@split_core'
 ]
 
 [project.urls]