diff --git a/lower-constraints.txt b/lower-constraints.txt
index c36a9dfe..c3573696 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -12,7 +12,7 @@ contextlib2==0.4.0
 coverage==5.2.1
 cryptography==3.0
 debtcollector==1.2.0
-decorator==3.4.0
+decorator==4.4.2
 deprecation==1.0
 django-appconf==1.0.2
 django-babel==0.6.2
diff --git a/requirements.txt b/requirements.txt
index 4b0c4045..8deb3249 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,4 +3,4 @@
 # process, which may cause wedges in the gate later.
 oslo.log>=3.36.0 # Apache-2.0
 python-monascaclient>=1.8.0 # Apache-2.0
-horizon>=17.1.0 # Apache-2.0
+horizon>=18.3.0 # Apache-2.0