diff --git a/package.json b/package.json
index eaf8851..331fa48 100644
--- a/package.json
+++ b/package.json
@@ -70,7 +70,7 @@
     "eslint-config-standard": "^17.1.0",
     "htm": "^3.1.1",
     "partykit": "0.0.108",
-    "postcss-nesting": "^12.1.1",
+    "postcss-nesting": "^13.0.0",
     "preact": "^10.20.2",
     "tap-spec": "^5.0.0",
     "tape-run": "^11.0.0",