diff --git a/upper-constraints.txt b/upper-constraints.txt
index 62dd20e6c5..7e3efa0e88 100644
--- a/upper-constraints.txt
+++ b/upper-constraints.txt
@@ -115,7 +115,7 @@ jaraco.classes===3.4.0
 debtcollector===3.0.0
 responses===0.25.7
 croniter===6.0.0
-horizon===25.5.0
+horizon===25.5.1
 octavia-lib===3.10.0
 python-watcherclient===4.9.0
 MarkupSafe===3.0.2