diff --git a/news/changelog-1.10.md b/news/changelog-1.10.md
index 1131985c67d..f7a91e0c8ab 100644
--- a/news/changelog-1.10.md
+++ b/news/changelog-1.10.md
@@ -51,4 +51,5 @@ All changes included in 1.10:
 
 - ([#6651](https://github.com/quarto-dev/quarto-cli/issues/6651)): Fix dart-sass compilation failing in enterprise environments where `.bat` files are blocked by group policy.
 - ([#14255](https://github.com/quarto-dev/quarto-cli/issues/14255)): Fix shortcodes inside inline and display math expressions not being resolved.
-- ([#14342](https://github.com/quarto-dev/quarto-cli/issues/14342)): Work around TOCTOU race in Deno's `expandGlobSync` that can cause unexpected exceptions to be raised while traversing directories during project initialization.
\ No newline at end of file
+- ([#14342](https://github.com/quarto-dev/quarto-cli/issues/14342)): Work around TOCTOU race in Deno's `expandGlobSync` that can cause unexpected exceptions to be raised while traversing directories during project initialization.
+- ([#14299](https://github.com/quarto-dev/quarto-cli/issues/14299)): Update default arrow-light theme to highlight BuiltIn and Extension styles
diff --git a/src/resources/pandoc/highlight-styles/arrow-light.theme b/src/resources/pandoc/highlight-styles/arrow-light.theme
index a43579646bd..afc4066e695 100644
--- a/src/resources/pandoc/highlight-styles/arrow-light.theme
+++ b/src/resources/pandoc/highlight-styles/arrow-light.theme
@@ -92,14 +92,14 @@
             "underline": false
         },
         "BuiltIn": {
-            "text-color": null,
+            "text-color": "#4758AB",
             "background-color": null,
             "bold": false,
             "italic": false,
             "underline": false
         },
         "Extension": {
-            "text-color": null,
+            "text-color": "#4758AB",
             "background-color": null,
             "bold": false,
             "italic": false,