diff --git a/a_swift_tour.html b/a_swift_tour.html
index bf53046b..9908a459 100644
--- a/a_swift_tour.html
+++ b/a_swift_tour.html
@@ -707,8 +707,8 @@ anyCommonElements([1, 2, 3], [3])
 
         
 
-        <script src="https://cdnjs.cloudflare.com/ajax/libs/ace/1.1.3/ace.js"></script>
-        <script src="https://cdnjs.cloudflare.com/ajax/libs/ace/1.1.3/mode-javascript.js"></script>
+        <script src="http://cdn.bootcss.com/ace/1.1.3/ace.js"></script>
+        <script src="http://cdn.bootcss.com/ace/1.1.3/mode-javascript.js"></script>
         <script src="gitbook/jsrepl/jsrepl.js" id="jsrepl-script"></script>
         <script src="gitbook/app.js"></script>
         
diff --git a/index.html b/index.html
index 0365e108..19f582f5 100644
--- a/index.html
+++ b/index.html
@@ -209,8 +209,8 @@
 
         
 
-        <script src="https://cdnjs.cloudflare.com/ajax/libs/ace/1.1.3/ace.js"></script>
-        <script src="https://cdnjs.cloudflare.com/ajax/libs/ace/1.1.3/mode-javascript.js"></script>
+        <script src="http://cdn.bootcss.com/ace/1.1.3/ace.js"></script>
+        <script src="http://cdn.bootcss.com/ace/1.1.3/mode-javascript.js"></script>
         <script src="gitbook/jsrepl/jsrepl.js" id="jsrepl-script"></script>
         <script src="gitbook/app.js"></script>
         
diff --git a/swift/README.html b/swift/README.html
index 30416ac7..3c7d5c3a 100644
--- a/swift/README.html
+++ b/swift/README.html
@@ -212,8 +212,8 @@
 
         
 
-        <script src="https://cdnjs.cloudflare.com/ajax/libs/ace/1.1.3/ace.js"></script>
-        <script src="https://cdnjs.cloudflare.com/ajax/libs/ace/1.1.3/mode-javascript.js"></script>
+        <script src="http://cdn.bootcss.com/ace/1.1.3/ace.js"></script>
+         <script src="http://cdn.bootcss.com/ace/1.1.3/mode-javascript.js"></script>
         <script src="../gitbook/jsrepl/jsrepl.js" id="jsrepl-script"></script>
         <script src="../gitbook/app.js"></script>
         
diff --git a/swift/swift.html b/swift/swift.html
index 7f9a1501..95887308 100644
--- a/swift/swift.html
+++ b/swift/swift.html
@@ -217,8 +217,8 @@
 
         
 
-        <script src="https://cdnjs.cloudflare.com/ajax/libs/ace/1.1.3/ace.js"></script>
-        <script src="https://cdnjs.cloudflare.com/ajax/libs/ace/1.1.3/mode-javascript.js"></script>
+        <script src="http://cdn.bootcss.com/ace/1.1.3/ace.js"></script>
+        <script src="http://cdn.bootcss.com/ace/1.1.3/mode-javascript.js"></script>
         <script src="../gitbook/jsrepl/jsrepl.js" id="jsrepl-script"></script>
         <script src="../gitbook/app.js"></script>