diff --git a/package.json b/package.json
index 454944ebe..f31bb7a7d 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     "test": "mocha"
   },
   "dependencies": {
-    "@glimmer/syntax": "^0.42.2",
+    "@glimmer/syntax": "^0.43.0",
     "chalk": "^2.0.0",
     "globby": "^9.0.0",
     "minimatch": "^3.0.4",
diff --git a/yarn.lock b/yarn.lock
index 67bb0772f..314b2e7cd 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -18,25 +18,25 @@
     esutils "^2.0.2"
     js-tokens "^4.0.0"
 
-"@glimmer/interfaces@^0.42.2":
-  version "0.42.2"
-  resolved "https://registry.yarnpkg.com/@glimmer/interfaces/-/interfaces-0.42.2.tgz#9cf8d6f8f5eee6bfcfa36919ca68ae716e1f78db"
-  integrity sha512-7LOuQd02cxxNNHChzdHMAU8/qOeQvTro141CU5tXITP7z6aOv2D2gkFdau97lLQiVxezGrh8J7h8GCuF7TEqtg==
-
-"@glimmer/syntax@^0.42.2":
-  version "0.42.2"
-  resolved "https://registry.yarnpkg.com/@glimmer/syntax/-/syntax-0.42.2.tgz#89bb3cb787285b84665dc0d8907d94b008e5be9a"
-  integrity sha512-SR26SmF/Mb5o2cc4eLHpOyoX5kwwXP4KRhq4fbWfrvan74xVWA38PLspPCzwGhyVH/JsE7tUEPMjSo2DcJge/Q==
-  dependencies:
-    "@glimmer/interfaces" "^0.42.2"
-    "@glimmer/util" "^0.42.2"
+"@glimmer/interfaces@^0.43.0":
+  version "0.43.0"
+  resolved "https://registry.yarnpkg.com/@glimmer/interfaces/-/interfaces-0.43.0.tgz#a7a38c2476f87d68d6dc894840df17bc8b92de33"
+  integrity sha512-rWu6WHVo6tuFFOKOSJWAWsFfXZgkdnKDnvhl3tAb20njW/0uBZ2nx7GZ3lImvBeG0HoxyzYA7pD299ps03TemA==
+
+"@glimmer/syntax@^0.43.0":
+  version "0.43.0"
+  resolved "https://registry.yarnpkg.com/@glimmer/syntax/-/syntax-0.43.0.tgz#d6e30c857c575eeac25b3f7ffab2cfee43685726"
+  integrity sha512-qJqzcbF9lgdLE5A1rCwTs0CLnblNK95Y6MMLNsvJEJA7j1Gx50ySoUZ5HTk86Z5auhDgvInhuufyGtdojSIMSg==
+  dependencies:
+    "@glimmer/interfaces" "^0.43.0"
+    "@glimmer/util" "^0.43.0"
     handlebars "^4.0.13"
     simple-html-tokenizer "^0.5.8"
 
-"@glimmer/util@^0.42.2":
-  version "0.42.2"
-  resolved "https://registry.yarnpkg.com/@glimmer/util/-/util-0.42.2.tgz#9ca1631e42766ea6059f4b49d0bdfb6095aad2c4"
-  integrity sha512-Heck0baFSaWDanCYtmOcLeaz7v+rSqI8ovS7twrp2/FWEteb3Ze5sWQ2BEuSAG23L/k/lzVwYM/MY7ZugxBpaA==
+"@glimmer/util@^0.43.0":
+  version "0.43.0"
+  resolved "https://registry.yarnpkg.com/@glimmer/util/-/util-0.43.0.tgz#dd28cd1a233c25427032437b9050c6fa6d098e2c"
+  integrity sha512-RtjHU8/rhysOugu+Q0j6dQ3G67J4h45tQgKPEwVPxu8P+hqijqnz/lBLxTdVg/1zKmlqUkyngTr8H4Jpg2yF/g==
 
 "@iarna/toml@2.2.3":
   version "2.2.3"