diff --git a/assets/index.html b/assets/index.html
index 84fbdc4..3c01a16 100644
--- a/assets/index.html
+++ b/assets/index.html
@@ -256,7 +256,7 @@ <h4 class="modal-title">
     <div class="col-md-12">
       <div id="footer" class="pull-right" style="margin: 2em 1em">
         <a href="https://github.com/codeskyblue/gohttpserver">gohttpserver (ver:{{version}})</a>, written by <a href="https://github.com/codeskyblue">codeskyblue</a>.
-        Copyright 2016-2018. go1.10
+        Copyright 2016-2020. go1.14
       </div>
     </div>
   </div>
diff --git a/go.mod b/go.mod
index a234430..6da0c24 100644
--- a/go.mod
+++ b/go.mod
@@ -1,5 +1,7 @@
 module github.com/codeskyblue/gohttpserver
 
+go 1.14
+
 require (
 	github.com/alecthomas/kingpin v2.2.6+incompatible
 	github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc