diff --git a/lower-constraints.txt b/lower-constraints.txt
index b20720e..10fe901 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -11,7 +11,7 @@ contextlib2==0.4.0
 coverage==4.0
 cryptography==3.0
 debtcollector==1.2.0
-decorator==3.4.0
+decorator==4.0.0
 deprecation==1.0
 Django==2.2
 django-appconf==1.0.2
@@ -27,7 +27,7 @@ fasteners==0.7.0
 fixtures==3.0.0
 futurist==1.2.0
 greenlet==0.4.10
-horizon==17.1.0
+horizon==18.3.1
 idna==2.6
 imagesize==0.7.1
 iso8601==0.1.11
@@ -132,7 +132,7 @@ XStatic-jquery-ui==1.10.4.1
 XStatic-JQuery.quicksearch==2.0.3.1
 XStatic-JQuery.TableSorter==2.14.5.1
 XStatic-JSEncrypt==2.3.1.1
-XStatic-mdi==1.4.57.0
+XStatic-mdi==1.6.50.2
 XStatic-objectpath==1.2.1.0
 XStatic-Rickshaw==1.5.0.0
 XStatic-roboto-fontface==0.5.0.0
diff --git a/requirements.txt b/requirements.txt
index 312c39b..228c0ab 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,5 +3,5 @@
 # process, which may cause wedges in the gate later.
 
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
-horizon>=17.1.0 # Apache-2.0
+horizon>=18.3.1 # Apache-2.0
 python-neutronclient>=6.7.0 # Apache-2.0