diff --git a/.travis.yml b/.travis.yml
index 9f3ffe2..e592506 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,6 @@
 sudo: false
 language: ruby
 rvm:
-  - 2.1.10
-  - 2.2.6
   - 2.3.3
   - 2.4.0
   - ruby-head
diff --git a/app/assets/javascripts/simple_form-bootstrap.js b/app/assets/javascripts/simple_form-bootstrap.js
index f172719..3656d07 100644
--- a/app/assets/javascripts/simple_form-bootstrap.js
+++ b/app/assets/javascripts/simple_form-bootstrap.js
@@ -18,10 +18,10 @@
     tokenfields.tokenfield();
   }
 
-  $(document).on('ready', function() {
+  $(function() {
     initializeComponents(document);
   });
-  $(document).on('DOMNodeInserted', function(e) {
+  $(document).on('MutationObserver', function(e) {
     initializeComponents(e.target);
   });
   $(document).on('nested:fieldAdded', function(e) {
diff --git a/lib/simple_form/bootstrap/version.rb b/lib/simple_form/bootstrap/version.rb
index 0cc436e..c20f277 100644
--- a/lib/simple_form/bootstrap/version.rb
+++ b/lib/simple_form/bootstrap/version.rb
@@ -1,4 +1,4 @@
 module SimpleForm; end
 module SimpleForm::Bootstrap
-  VERSION = '1.5.0'
+  VERSION = '1.6.0'
 end