diff --git a/css/questionset.css b/css/questionset.css
index 1ccf1e6..693b60f 100644
--- a/css/questionset.css
+++ b/css/questionset.css
@@ -138,12 +138,12 @@
 }
 
 .qs-footer a.next.button:after {
-  font-family: H5PFontAwesome;
-  content: " \f054";
+  font-family: 'H5PFontAwesome4';
+  content: " \f054"; /* TODO: Use margin not whitespace, spacing is not content! */
 }
 
 .qs-footer a.prev.button:before {
-  font-family: H5PFontAwesome;
+  font-family: 'H5PFontAwesome4';
   content: "\f053  ";
 }
 
@@ -152,12 +152,12 @@
 }
 
 .qs-footer a.finish.button:before {
-  font-family: H5PFontAwesome;
+  font-family: 'H5PFontAwesome4';
   content: "\f00c   ";
 }
 
 .questionset-results a.button.qs-solutionbutton:before {
-  font-family: H5PFontAwesome;
+  font-family: 'H5PFontAwesome4';
   content: "\f06e   ";
 }
 
diff --git a/library.json b/library.json
index 53abcd2..37294c1 100644
--- a/library.json
+++ b/library.json
@@ -3,7 +3,7 @@
   "contentType": "question",
   "majorVersion": 1,
   "minorVersion": 0,
-  "patchVersion": 50,
+  "patchVersion": 51,
   "runnable": 1,
   "fullscreen": 0,
   "machineName": "H5P.QuestionSet",
@@ -32,7 +32,7 @@
     },
     {
       "machineName": "FontAwesome",
-      "majorVersion": 3,
+      "majorVersion": 4,
       "minorVersion": 1
     },
     {