diff --git a/config.json.example b/config.json.example
index 1c313e23..18959393 100644
--- a/config.json.example
+++ b/config.json.example
@@ -125,7 +125,7 @@
         },
         "plantuml":
         {
-          "server": "http://www.plantuml.com/plantuml"
+          "server": "https://www.plantuml.com/plantuml"
         }
     }
 }
diff --git a/lib/config/default.js b/lib/config/default.js
index 692c9b48..c9e09c00 100644
--- a/lib/config/default.js
+++ b/lib/config/default.js
@@ -153,6 +153,9 @@ module.exports = {
       email: undefined
     }
   },
+  plantuml: {
+    server: 'https://www.plantuml.com/plantuml'
+  },
   email: true,
   allowEmailRegister: true,
   allowGravatar: true,
diff --git a/public/js/index.js b/public/js/index.js
index 7e774982..938ad908 100644
--- a/public/js/index.js
+++ b/public/js/index.js
@@ -97,7 +97,7 @@ var cursorActivityDebounce = 50
 var cursorAnimatePeriod = 100
 var supportContainers = ['success', 'info', 'warning', 'danger', 'spoiler']
 var supportCodeModes = ['javascript', 'typescript', 'jsx', 'htmlmixed', 'htmlembedded', 'css', 'xml', 'clike', 'clojure', 'ruby', 'python', 'shell', 'php', 'sql', 'haskell', 'coffeescript', 'yaml', 'pug', 'lua', 'cmake', 'nginx', 'perl', 'sass', 'r', 'dockerfile', 'tiddlywiki', 'mediawiki', 'go', 'gherkin'].concat(hljs.listLanguages())
-var supportCharts = ['sequence', 'flow', 'graphviz', 'mermaid', 'abc']
+var supportCharts = ['sequence', 'flow', 'graphviz', 'mermaid', 'abc', 'plantuml']
 var supportHeaders = [
   {
     text: '# h1',