diff --git a/package.json b/package.json
index 12b20b32..19d9aa87 100644
--- a/package.json
+++ b/package.json
@@ -90,7 +90,7 @@
   "dependencies": {
     "preact": "^8.1.0",
     "preact-compat": "^3.15.0",
-    "preact-render-to-string": "^3.6.0",
+    "preact-render-to-string": "^5.1.9",
     "preact-router": "^2.5.1",
     "promise-polyfill": "^7.0.1",
     "proptypes": "^1.0.0",