diff --git a/global-requirement-pins.txt b/global-requirement-pins.txt
index 0056fa73f5..ec198a797b 100644
--- a/global-requirement-pins.txt
+++ b/global-requirement-pins.txt
@@ -5,6 +5,11 @@
 #
 # Use this file with caution!
 #
+
+### Pinned for gnocchi's dependency pycradox
+# https://github.com/sileht/pycradox/commit/2209f89fd65ecf31bea8eac6405acce2543e7b84
+Cython<0.28
+
 ###
 ### These are pinned to ensure exactly the same behaviour forever!   ###
 ### These pins are updated through the sources-branch-updater script ###