diff --git a/appliances/chromium.gns3a b/appliances/chromium.gns3a
index 8488b90..655b69d 100644
--- a/appliances/chromium.gns3a
+++ b/appliances/chromium.gns3a
@@ -11,7 +11,7 @@
     "maintainer_email": "developers@gns3.net",
     "docker": {
         "adapters": 1,
-        "image": "gns3/chromium",
+        "image": "gns3/chromium:latest",
         "console_type": "vnc"
     }
 }
diff --git a/appliances/ipterm.gns3a b/appliances/ipterm.gns3a
index a84362f..05e40fa 100644
--- a/appliances/ipterm.gns3a
+++ b/appliances/ipterm.gns3a
@@ -13,6 +13,6 @@
     "symbol": "linux_guest.svg",
     "docker": {
         "adapters": 1,
-        "image": "gns3/ipterm"
+        "image": "gns3/ipterm:latest"
     }
 }
diff --git a/appliances/openvswitch-management.gns3a b/appliances/openvswitch-management.gns3a
index c2c815d..b240ec4 100644
--- a/appliances/openvswitch-management.gns3a
+++ b/appliances/openvswitch-management.gns3a
@@ -13,7 +13,7 @@
     "usage": "The eth0 is the management interface. By default all other interfaces are connected to the br0",
     "docker": {
         "adapters": 16,
-        "image": "gns3/openvswitch",
+        "image": "gns3/openvswitch:latest",
         "environment": "MANAGEMENT_INTERFACE=1"
     }
 }
diff --git a/appliances/openvswitch.gns3a b/appliances/openvswitch.gns3a
index 63e8d01..73ceaeb 100644
--- a/appliances/openvswitch.gns3a
+++ b/appliances/openvswitch.gns3a
@@ -13,6 +13,6 @@
     "usage": "By default all interfaces are connected to the br0",
     "docker": {
         "adapters": 16,
-        "image": "gns3/openvswitch"
+        "image": "gns3/openvswitch:latest"
     }
 }
diff --git a/appliances/webterm.gns3a b/appliances/webterm.gns3a
index 1adcbd1..b4de825 100644
--- a/appliances/webterm.gns3a
+++ b/appliances/webterm.gns3a
@@ -13,7 +13,7 @@
     "symbol": "firefox.svg",
     "docker": {
         "adapters": 1,
-        "image": "gns3/webterm",
+        "image": "gns3/webterm:latest",
         "console_type": "vnc"
     }
 }
diff --git a/schemas/appliance.json b/schemas/appliance.json
index 0d4d659..f34cc6f 100644
--- a/schemas/appliance.json
+++ b/schemas/appliance.json
@@ -106,7 +106,8 @@
             },
             "image": {
                 "type": "string",
-                "title": "Docker image in the Docker Hub"
+                "title": "Docker image in the Docker Hub",
+                "pattern": ".+:.+"
             },
             "start_command": {
                 "type": "string",