diff --git a/packages/plugos/package.json b/packages/plugos/package.json
index 2bafdf1..613eab5 100644
--- a/packages/plugos/package.json
+++ b/packages/plugos/package.json
@@ -59,7 +59,7 @@
     "yargs": "^17.3.1"
   },
   "devDependencies": {
-    "@lezer/lr": "^0.16.1",
+    "@lezer/lr": "^0.15.0",
     "@parcel/optimizer-data-url": "2.3.2",
     "@parcel/packager-raw-url": "2.3.2",
     "@parcel/service-worker": "2.3.2",
diff --git a/yarn.lock b/yarn.lock
index c80be76..c92fc64 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1859,6 +1859,7 @@ __metadata:
   resolution: "@silverbulletmd/plugos@workspace:packages/plugos"
   dependencies:
     "@jest/globals": ^27.5.1
+    "@lezer/lr": ^0.15.0
     "@parcel/optimizer-data-url": 2.3.2
     "@parcel/packager-raw-url": 2.3.2
     "@parcel/service-worker": 2.3.2