diff --git a/package.json b/package.json
index af23e996..ba8f2f36 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
   "devDependencies": {
     "@ember/optional-features": "2.0.0",
     "@ember/test-helpers": "2.9.3",
-    "@glimmer/syntax": "0.84.3",
+    "@glimmer/syntax": "0.91.2",
     "@glimmer/syntax-0.35.11": "npm:@glimmer/syntax@0.35.11",
     "@glimmer/syntax-0.37.1": "npm:@glimmer/syntax@0.37.1",
     "@glimmer/syntax-0.40.1": "npm:@glimmer/syntax@0.40.1",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 8a16c4e1..bd4fbb49 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -1,5 +1,9 @@
 lockfileVersion: '6.0'
 
+settings:
+  autoInstallPeers: true
+  excludeLinksFromLockfile: false
+
 dependencies:
   hash-obj:
     specifier: ^3.0.0
@@ -13,8 +17,8 @@ devDependencies:
     specifier: 2.9.3
     version: 2.9.3(@babel/core@7.21.8)(ember-source@4.12.0)
   '@glimmer/syntax':
-    specifier: 0.84.3
-    version: 0.84.3
+    specifier: 0.91.2
+    version: 0.91.2
   '@glimmer/syntax-0.35.11':
     specifier: npm:@glimmer/syntax@0.35.11
     version: /@glimmer/syntax@0.35.11
@@ -1583,8 +1587,8 @@ packages:
       '@simple-dom/interface': 1.4.0
     dev: true
 
-  /@glimmer/interfaces@0.84.3:
-    resolution: {integrity: sha512-dk32ykoNojt0mvEaIW6Vli5MGTbQo58uy3Epj7ahCgTHmWOKuw/0G83f2UmFprRwFx689YTXG38I/vbpltEjzg==}
+  /@glimmer/interfaces@0.91.2:
+    resolution: {integrity: sha512-AVmS2zgT+ndlAiPrdMYNkSKOqZvz+IKLvTXJpWZC/SINXKI2fiHMBGrZKP0dKNqyFeugKdEf2N81Y45sMM06PQ==}
     dependencies:
       '@simple-dom/interface': 1.4.0
     dev: true
@@ -1625,11 +1629,12 @@ packages:
       simple-html-tokenizer: 0.5.11
     dev: true
 
-  /@glimmer/syntax@0.84.3:
-    resolution: {integrity: sha512-ioVbTic6ZisLxqTgRBL2PCjYZTFIwobifCustrozRU2xGDiYvVIL0vt25h2c1ioDsX59UgVlDkIK4YTAQQSd2A==}
+  /@glimmer/syntax@0.91.2:
+    resolution: {integrity: sha512-+DOnlECVkbIvHme3faCqmgZJ6bSnIkVz5ZEK+NoorgG76l4XEkcQzSG+pg4acC/+UhlZEEOOBB0UX+fGJUX03w==}
     dependencies:
-      '@glimmer/interfaces': 0.84.3
-      '@glimmer/util': 0.84.3
+      '@glimmer/interfaces': 0.91.2
+      '@glimmer/util': 0.91.2
+      '@glimmer/wire-format': 0.91.2
       '@handlebars/parser': 2.0.0
       simple-html-tokenizer: 0.5.11
     dev: true
@@ -1658,12 +1663,11 @@ packages:
       '@simple-dom/interface': 1.4.0
     dev: true
 
-  /@glimmer/util@0.84.3:
-    resolution: {integrity: sha512-qFkh6s16ZSRuu2rfz3T4Wp0fylFj3HBsONGXQcrAdZjdUaIS6v3pNj6mecJ71qRgcym9Hbaq/7/fefIwECUiKw==}
+  /@glimmer/util@0.91.2:
+    resolution: {integrity: sha512-pCasBL49fX23S0ZH3FZqpoO+8sZfYtNa8Lc4d/JMXDf5RyVAYG8DN4oad08tNPUKDX+Jt+ZS8MDaQvX07McvTA==}
     dependencies:
       '@glimmer/env': 0.1.7
-      '@glimmer/interfaces': 0.84.3
-      '@simple-dom/interface': 1.4.0
+      '@glimmer/interfaces': 0.91.2
     dev: true
 
   /@glimmer/vm-babel-plugins@0.84.2(@babel/core@7.21.8):
@@ -1686,6 +1690,13 @@ packages:
       '@glimmer/util': 0.37.1
     dev: true
 
+  /@glimmer/wire-format@0.91.2:
+    resolution: {integrity: sha512-ZBtea8p4f/ECagChjHFh8s0NrX+lM1nCWCiP1Z0HaGomQuH05rLS4meTJHKiLXvc9K7yuK1NDt5QNrZGfRXI6g==}
+    dependencies:
+      '@glimmer/interfaces': 0.91.2
+      '@glimmer/util': 0.91.2
+    dev: true
+
   /@handlebars/parser@1.1.0:
     resolution: {integrity: sha512-rR7tJoSwJ2eooOpYGxGGW95sLq6GXUaS1UtWvN7pei6n2/okYvCGld9vsUTvkl2migxbkszsycwtMf/GEc1k1A==}
     dev: true
@@ -7426,6 +7437,7 @@ packages:
   /iconv-lite@0.6.3:
     resolution: {integrity: sha512-4fCk79wshMdzMp2rH06qWrJE4iolqLhCUH+OiuIgU++RB0+94NlDL81atO7GX55uUKueo0txHNtvEyI6D7WdMw==}
     engines: {node: '>=0.10.0'}
+    requiresBuild: true
     dependencies:
       safer-buffer: 2.1.2
     dev: true