diff --git a/setup.py b/setup.py
index 8cd7928578..304ca82a88 100644
--- a/setup.py
+++ b/setup.py
@@ -11,7 +11,7 @@
     "scipy==1.8.*",
     "scanpy>=1.6",
     "louvain==0.7.*",
-    "decorator<5.0",  # pinned in #324
+    "decorator<6.0",  # pinned in #324
     "memory-profiler==0.60",
     "colorama==0.4.*",
     "packaging==21.3",