diff --git a/custom-error/src/main/resources/static/index.html b/custom-error/src/main/resources/static/index.html
index 905c4cb..40104c1 100644
--- a/custom-error/src/main/resources/static/index.html
+++ b/custom-error/src/main/resources/static/index.html
@@ -55,7 +55,7 @@ <h1>Login</h1>
                  $(".error").html('');
              }
           });
-          var logout = function() {
+          const logout = function() {
             $.post("/logout", function() {
               $("#user").html('');
               $(".unauthenticated").show();
diff --git a/logout/src/main/resources/static/index.html b/logout/src/main/resources/static/index.html
index 6714561..73224be 100644
--- a/logout/src/main/resources/static/index.html
+++ b/logout/src/main/resources/static/index.html
@@ -46,7 +46,7 @@ <h1>Login</h1>
             $(".unauthenticated").hide();
             $(".authenticated").show();
           });
-          var logout = function() {
+          const logout = function() {
             $.post("/logout", function() {
               $("#user").html('');
               $(".unauthenticated").show();
diff --git a/two-providers/src/main/resources/static/index.html b/two-providers/src/main/resources/static/index.html
index 09bd313..f574c23 100644
--- a/two-providers/src/main/resources/static/index.html
+++ b/two-providers/src/main/resources/static/index.html
@@ -49,7 +49,7 @@ <h1>Login</h1>
               $(".unauthenticated").hide();
               $(".authenticated").show();
           });
-          var logout = function() {
+          const logout = function() {
             $.post("/logout", function() {
               $("#user").html('');
               $(".unauthenticated").show();