diff --git a/CHANGELOG.md b/CHANGELOG.md
index b47f2cc67..0d4b03aff 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,8 @@
 
 [Full changelog][unreleased]
 
+- theme colour has changed from blue to a black
+
 ## Release 156 - 2024-12-12
 
 [Full changelog][156]
diff --git a/app/views/layouts/application.html.haml b/app/views/layouts/application.html.haml
index 2d8c1eaba..167f275ea 100644
--- a/app/views/layouts/application.html.haml
+++ b/app/views/layouts/application.html.haml
@@ -11,9 +11,10 @@
     %meta{charset: "utf-8"}/
     %title #{content_for :page_title_prefix} - #{t('app.title')}
     %meta{content: "width=device-width, initial-scale=1", name: "viewport"}/
-    %meta{content: "blue", name: "theme-color"}/
+    %meta{content: "#0b0c0c", name: "theme-color"}/
     %link{href: asset_path("favicon.ico"), rel: "shortcut icon", type: "image/x-icon"}/
 
+
     /[if !IE 8]
     = stylesheet_link_tag 'application', media: 'all'
     /[if lt IE 9]