diff --git a/theme/boost/scss/preset/default.scss b/theme/boost/scss/preset/default.scss
index 4caf3174079..75dbfce0a68 100644
--- a/theme/boost/scss/preset/default.scss
+++ b/theme/boost/scss/preset/default.scss
@@ -44,7 +44,7 @@ $body-color:    $gray-900 !default;
 // Fonts
 $font-size-base: 0.9375rem !default;
 $rfs-base-font-size: 0.9rem !default;
-$headings-font-weight:   300 !default;
+$headings-font-weight:   700 !default;
 
 // Navbar
 $navbar-dark-hover-color:           rgba($white, 1) !default;
diff --git a/theme/boost/style/moodle.css b/theme/boost/style/moodle.css
index 9187819b5cc..fde6c805c11 100644
--- a/theme/boost/style/moodle.css
+++ b/theme/boost/style/moodle.css
@@ -2629,7 +2629,7 @@ template {
 h1, h2, h3, h4, h5, h6,
 .h1, .h2, .h3, .h4, .h5, .h6 {
   margin-bottom: 0.5rem;
-  font-weight: 300;
+  font-weight: 700;
   line-height: 1.2; }
 
 h1, .h1 {