diff --git a/js/src/common/utils/patchMithril.js b/js/src/common/utils/patchMithril.js
index 8360e2b95..a1b114167 100644
--- a/js/src/common/utils/patchMithril.js
+++ b/js/src/common/utils/patchMithril.js
@@ -1,12 +1,9 @@
-import Link from '../components/Link';
 import withAttr from './withAttr';
 import Stream from './Stream';
 
 let deprecatedMPropWarned = false;
 let deprecatedMWithAttrWarned = false;
 
-let deprecatedRouteWarned = false;
-
 export default function patchMithril(global) {
   const defaultMithril = global.m;
 
@@ -20,31 +17,13 @@ export default function patchMithril(global) {
       modifiedMithril.bidi(node, node.attrs.bidi);
     }
 
-    // DEPRECATED, REMOVE BETA 15
-
-    // Allows us to use a "route" attr on links, which will automatically convert the link to one which
-    // supports linking to other pages in the SPA without refreshing the document.
-    if (node.attrs.route) {
-      if (!deprecatedRouteWarned) {
-        deprecatedRouteWarned = true;
-        console.warn('The route attr patch for links is deprecated, please use the Link component (flarum/components/Link) instead.');
-      }
-
-      node.attrs.href = node.attrs.route;
-      node.tag = Link;
-
-      delete node.attrs.route;
-    }
-
-    // END DEPRECATED
-
     return node;
   };
 
   Object.keys(defaultMithril).forEach((key) => (modifiedMithril[key] = defaultMithril[key]));
 
   // BEGIN DEPRECATED MITHRIL 2 BC LAYER
-  modifiedMithril.prop = modifiedMithril.stream = function (...args) {
+  modifiedMithril.prop = function (...args) {
     if (!deprecatedMPropWarned) {
       deprecatedMPropWarned = true;
       console.warn('m.prop() is deprecated, please use the Stream util (flarum/utils/Streams) instead.');