diff --git a/.changeset/good-garlics-taste.md b/.changeset/good-garlics-taste.md
new file mode 100644
index 000000000..10a12476e
--- /dev/null
+++ b/.changeset/good-garlics-taste.md
@@ -0,0 +1,5 @@
+---
+'gitbook': patch
+---
+
+Fix a regression in variant drop-down caused by missing z-index.
diff --git a/packages/gitbook/src/components/Header/Dropdown.tsx b/packages/gitbook/src/components/Header/Dropdown.tsx
index 36e938714..597522a49 100644
--- a/packages/gitbook/src/components/Header/Dropdown.tsx
+++ b/packages/gitbook/src/components/Header/Dropdown.tsx
@@ -44,6 +44,7 @@ export function Dropdown<E extends HTMLElement>(props: {
                     'absolute',
                     'top-full',
                     'left-0',
+                    'z-20',
                     'origin-top-left',
                     'invisible',
                     'transition-opacity',