diff --git a/setup.cfg b/setup.cfg
index 7f6b0672..e160c4dc 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -13,7 +13,7 @@ github_project = stellarphot/stellarphot
 
 [options]
 install_requires =
-    astropy >=5
+    astropy >=5,<6
     astroquery
     ccdproc
     ginga