diff --git a/setup.cfg b/setup.cfg
index 9457c14e..2c607ca9 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -35,7 +35,7 @@ setup_requires =
   setuptools_scm
 install_requires =
   scipy
-  sunpy[net,timeseries]>=4.0.0
+  sunpy[net,timeseries]==5.1.0rc1
 
 [options.extras_require]
 tests =