diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0f4b5b47d09116157bb30ee904f4c8dd6ba0a8bf..c5b7f986ba8e7f47274b8fdeb40bc5c4bf6c5716 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@
     sources.
 * Fixed `DEADLINE_EXCEEDED` error which occasionally occured when calling
     sendNote.
+* Fixed style for gitlab-heatmap partial to match overall theme.
 
 ## 2.1.0
 
diff --git a/layouts/partials/head.html b/layouts/partials/head.html
index 0ce9bf10b2cc3f8d4b4eb76b02d0a32dc42d0710..6fc49411b63846775fad289f90235814a9a41695 100644
--- a/layouts/partials/head.html
+++ b/layouts/partials/head.html
@@ -225,6 +225,7 @@ document.addEventListener("DOMContentLoaded", function() {
     // Now render it.
     const cal = new CalHeatmap();
     cal.paint({
+      theme: 'light',
       data: {
         source: newData,
         type: 'json',