diff --git a/docs/assets/bootstrap.zip b/docs/assets/bootstrap.zip
index 4200701c9e..4148e5ee9c 100644
Binary files a/docs/assets/bootstrap.zip and b/docs/assets/bootstrap.zip differ
diff --git a/docs/assets/css/bootstrap.css b/docs/assets/css/bootstrap.css
index de85e20824..5980f06755 100644
--- a/docs/assets/css/bootstrap.css
+++ b/docs/assets/css/bootstrap.css
@@ -311,7 +311,7 @@ h5,
 h6 {
   margin: 0;
   font-family: inherit;
-  font-weight: normal;
+  font-weight: bold;
   color: inherit;
   text-rendering: optimizelegibility;
 }
diff --git a/less/variables.less b/less/variables.less
index a882887733..fef3ee0ee5 100644
--- a/less/variables.less
+++ b/less/variables.less
@@ -51,7 +51,7 @@
 @altFontFamily:         Georgia, "Times New Roman", Times, serif;
 
 @headingsFontFamily:    inherit; // empty to use BS default, @baseFontFamily
-@headingsFontWeight:    normal;  // instead of browser default, bold
+@headingsFontWeight:    bold;    // instead of browser default, bold
 @headingsColor:         inherit; // empty to use BS default, @textColor