diff --git a/bower.json b/bower.json
index 0136a82da6..f2e439e906 100644
--- a/bower.json
+++ b/bower.json
@@ -16,9 +16,9 @@
     "marked": "~0.5",
     "MathJax": "^2.7.4",
     "moment": "~2.19.3",
-    "preact": "https://unpkg.com/preact@^7.2.0/dist/preact.min.js",
-    "preact-compat": "https://unpkg.com/preact-compat@^3.14.3/dist/preact-compat.min.js",
-    "proptypes": "https://unpkg.com/proptypes@^0.14.4/index.js",
+    "preact": "https://unpkg.com/preact@~7.2.0/dist/preact.min.js",
+    "preact-compat": "https://unpkg.com/preact-compat@~3.14.3/dist/preact-compat.min.js",
+    "proptypes": "https://unpkg.com/proptypes@~0.14.4/index.js",
     "requirejs": "~2.2",
     "requirejs-text": "~2.0.15",
     "requirejs-plugins": "~1.0.3",
diff --git a/notebook/static/base/js/dialog.js b/notebook/static/base/js/dialog.js
index b59d9908b1..4aa50f1c16 100644
--- a/notebook/static/base/js/dialog.js
+++ b/notebook/static/base/js/dialog.js
@@ -65,9 +65,8 @@ define(['jquery',
                     .attr("aria-hidden", "true")
                     .html("×")
                 ).append(
-                    $("<h4/>")
-                        .addClass('modal-title')
-                        .text(options.title || "")
+                    options.type ? options.type.addClass('modal-title').text(options.title || "")
+                        : $("<h4/>").addClass('modal-title').text(options.title || "")
                 )
         ).append(
             $("<div/>")
diff --git a/notebook/static/notebook/js/notebook.js b/notebook/static/notebook/js/notebook.js
index 556f3999a4..648b8e7922 100644
--- a/notebook/static/notebook/js/notebook.js
+++ b/notebook/static/notebook/js/notebook.js
@@ -1577,6 +1577,7 @@ define([
             notebook: this,
             keyboard_manager: this.keyboard_manager,
             title : i18n.msg._("Use markdown headings"),
+            type : $("<h1/>"),
             body : $("<p/>").text(
                 i18n.msg._('Jupyter no longer uses special heading cells. ' + 
                 'Instead, write your headings in Markdown cells using # characters:')