diff --git a/packages/@glimmer/syntax/package.json b/packages/@glimmer/syntax/package.json
index 672420775..f8246510e 100644
--- a/packages/@glimmer/syntax/package.json
+++ b/packages/@glimmer/syntax/package.json
@@ -41,7 +41,7 @@
     "@glimmer/interfaces": "workspace:*",
     "@glimmer/util": "workspace:*",
     "@glimmer/wire-format": "workspace:*",
-    "@handlebars/parser": "~2.1.0",
+    "@handlebars/parser": "~2.0.0",
     "simple-html-tokenizer": "^0.5.11"
   },
   "devDependencies": {
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 467d9791c..8a39f82ab 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -1452,8 +1452,8 @@ importers:
         specifier: workspace:*
         version: link:../wire-format
       '@handlebars/parser':
-        specifier: ~2.1.0
-        version: 2.1.0
+        specifier: ~2.0.0
+        version: 2.0.0
       simple-html-tokenizer:
         specifier: ^0.5.11
         version: 0.5.11
@@ -2792,8 +2792,8 @@ packages:
     resolution: {integrity: sha512-7bQW+gkKa2kKZPeJf6+c6gFK9ARxQfn+FKy9ScTBppyKRWH2KzsmweXUoklqeEiHiNVWaeP5csIdsNq6w7QhzA==}
     engines: {node: '>=12.20'}
 
-  '@handlebars/parser@2.1.0':
-    resolution: {integrity: sha512-R14NuNaSKZ6eE9y4t0fg/1f8iKd5ZJtSOTIseGFzXINTV17XffhLG2Y0CvdKOgyVQ7+UnXi89YGzRo/xsgwHIA==}
+  '@handlebars/parser@2.0.0':
+    resolution: {integrity: sha512-EP9uEDZv/L5Qh9IWuMUGJRfwhXJ4h1dqKTT4/3+tY0eu7sPis7xh23j61SYUnNF4vqCQvvUXpDo9Bh/+q1zASA==}
 
   '@humanfs/core@0.19.1':
     resolution: {integrity: sha512-5DyQ4+1JEUzejeK1JGICcideyfUbGixgS9jNgex5nqkW+cY7WZhxBigmieN5Qnw9ZosSNVC9KQKyb+GUaGyKUA==}
@@ -11777,7 +11777,7 @@ snapshots:
 
   '@gwhitney/detect-indent@7.0.1': {}
 
-  '@handlebars/parser@2.1.0': {}
+  '@handlebars/parser@2.0.0': {}
 
   '@humanfs/core@0.19.1': {}