diff --git a/package.json b/package.json
index f438f84..2144c4a 100644
--- a/package.json
+++ b/package.json
@@ -43,7 +43,7 @@
   "homepage": "https://github.com/bcomnes/bret.io#readme",
   "devDependencies": {
     "@tap-format/spec": "^0.2.0",
-    "autoprefixer": "^9.0.0",
+    "autoprefixer": "^10.0.0",
     "cpx2": "^2.0.0",
     "dependency-check": "^4.1.0",
     "generate-feed": "^1.1.13",