diff --git a/setup.cfg b/setup.cfg
index f4f2bd67..a07a20c3 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -56,7 +56,7 @@ python_requires = >=3.7
 include_package_data = True
 install_requires =
     metomi-rose==2.0.*
-    cylc-flow==8.0.*
+    cylc-flow==8.1.*
     metomi-isodatetime
     jinja2