diff --git a/.changeset/update-base-ui-1.4.0.md b/.changeset/update-base-ui-1.4.0.md
new file mode 100644
index 0000000000..598c3e874d
--- /dev/null
+++ b/.changeset/update-base-ui-1.4.0.md
@@ -0,0 +1,7 @@
+---
+"@cloudflare/kumo": patch
+---
+
+chore: update @base-ui/react to v1.4.0
+
+Bugfix release with improvements to Popover hover state, Checkbox/Switch readOnly mode, Select touch handling, Tabs activation direction, Toast timers, and various other fixes. No breaking changes.
diff --git a/packages/kumo/package.json b/packages/kumo/package.json
index 6400009663..dc2ca3e02c 100644
--- a/packages/kumo/package.json
+++ b/packages/kumo/package.json
@@ -446,7 +446,7 @@
     }
   },
   "dependencies": {
-    "@base-ui/react": "^1.2.0",
+    "@base-ui/react": "^1.4.0",
     "@shikijs/langs": "^4.0.0",
     "@shikijs/themes": "^4.0.0",
     "clsx": "^2.1.1",