diff --git a/bower.json b/bower.json
index ef5b61a721..1dad681bcc 100644
--- a/bower.json
+++ b/bower.json
@@ -8,17 +8,16 @@
   "license": "MIT",
   "private": true,
   "devDependencies": {
-    "polymer": "Polymer/polymer#~1.6",
-    "pikaday": "1.4",
-    "leaflet-map": "1.2.0",
+    "polymer": "Polymer/polymer#~1.6.1",
+    "pikaday": "~1.4.0",
+    "leaflet-map": "~1.2.0",
     "iron-elements": "PolymerElements/iron-elements#~1.0.10",
     "paper-elements": "PolymerElements/paper-elements#~1.0.7",
     "google-apis": "GoogleWebComponents/google-apis#~1.1.6",
-    "font-roboto-local": "^1.0.1",
-    "iron-flex-layout": "^1.3.1",
-    "paper-scroll-header-panel": "1.0.16",
-    "app-layout": "^0.10.1",
-    "fecha": "^2.2.0"
+    "font-roboto-local": "~1.0.1",
+    "paper-scroll-header-panel": "~1.0.16",
+    "app-layout": "~0.10.2",
+    "fecha": "~2.2.0"
   },
   "_comment": "specify iron-flex-layout for higher version than iron elements"
 }