diff --git a/package.json b/package.json
index 675f2a19..652b0cd0 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
     "@babel/plugin-transform-modules-amd": "^7.14.5",
     "@babel/plugin-transform-template-literals": "^7.14.5",
     "@babel/plugin-transform-unicode-escapes": "^7.14.5",
-    "@glimmer/syntax": "^0.77.6",
+    "@glimmer/syntax": "^0.79.4",
     "@types/line-column": "^1.0.0",
     "@types/string.prototype.matchall": "^4.0.0",
     "@typescript-eslint/eslint-plugin": "^4.28.0",
diff --git a/yarn.lock b/yarn.lock
index 24203bbc..c21e68ed 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1054,30 +1054,30 @@
   resolved "https://registry.yarnpkg.com/@glimmer/env/-/env-0.1.7.tgz#fd2d2b55a9029c6b37a6c935e8c8871ae70dfa07"
   integrity sha1-/S0rVakCnGs3psk16MiHGucN+gc=
 
-"@glimmer/interfaces@0.77.6":
-  version "0.77.6"
-  resolved "https://registry.yarnpkg.com/@glimmer/interfaces/-/interfaces-0.77.6.tgz#e11715bcdc5c5133cbb52db9a53b16c49ee611e5"
-  integrity sha512-VVsi6Z8BgV9Y42FSybiImb6BR00ILr5m5M0B2VbDFytuKR0scRf0xUzKQV+EgLXOwgu/L5XVQJMWElYxTh6xBw==
+"@glimmer/interfaces@0.79.4":
+  version "0.79.4"
+  resolved "https://registry.yarnpkg.com/@glimmer/interfaces/-/interfaces-0.79.4.tgz#3213e7fe73f35340762bef7f4e8c8df593a4a8c8"
+  integrity sha512-cyNZlRa7aXAfXY9kk7hhnWgL1R7Zw8wwi2UVEWq2nBanmpNmL1lSMJ6nY8oRIWCtWrYA9CeH7RZ6mVP5cQ/v2w==
   dependencies:
     "@simple-dom/interface" "^1.4.0"
 
-"@glimmer/syntax@^0.77.6":
-  version "0.77.6"
-  resolved "https://registry.yarnpkg.com/@glimmer/syntax/-/syntax-0.77.6.tgz#31142ba914ee123f9b5e5c70bd92272cb6258bca"
-  integrity sha512-Nh5D/IGpY7LQ5fmNEIeU9UdwIb9xaRfEefsSbIiBcHw13mauFVz7K+ZKIn3p1Qur6xWmUIKcYgXCAsOFFiOyQg==
+"@glimmer/syntax@^0.79.4":
+  version "0.79.4"
+  resolved "https://registry.yarnpkg.com/@glimmer/syntax/-/syntax-0.79.4.tgz#5aa21d4b3918238c24da3d640abc3b66150fc0c6"
+  integrity sha512-NiMIoW2G0+sBfLYnvDaZ8o8Ul/3P/ezOT8U7ZvsHDGU5hXM2buFozyoSKLILTvAQ56izdfK9fKCsn0oi4ISx3w==
   dependencies:
-    "@glimmer/interfaces" "0.77.6"
-    "@glimmer/util" "0.77.6"
+    "@glimmer/interfaces" "0.79.4"
+    "@glimmer/util" "0.79.4"
     "@handlebars/parser" "~2.0.0"
     simple-html-tokenizer "^0.5.10"
 
-"@glimmer/util@0.77.6":
-  version "0.77.6"
-  resolved "https://registry.yarnpkg.com/@glimmer/util/-/util-0.77.6.tgz#4997f9a066aab915f50c344b2aedab8108b4658b"
-  integrity sha512-IjrVvSv8fPCroyWHFaJO4q0iIy5s8Zge0PgghrI7Z4Ne5bKHifODy/6yAnA1EjE1NhHAVlZbHjI/pE17a+VjoA==
+"@glimmer/util@0.79.4":
+  version "0.79.4"
+  resolved "https://registry.yarnpkg.com/@glimmer/util/-/util-0.79.4.tgz#4762ed9b231482470cb9763332097d50042f9bde"
+  integrity sha512-n2lEGzM9khM43HmKlig2lG5L5cHoL4tFzW21CZzmhMfc1IDCqHuP7s7924OsXSbLT1WB7B9sm/ZhnEj2nd+GiQ==
   dependencies:
     "@glimmer/env" "0.1.7"
-    "@glimmer/interfaces" "0.77.6"
+    "@glimmer/interfaces" "0.79.4"
     "@simple-dom/interface" "^1.4.0"
 
 "@glimmer/vm-babel-plugins@0.78.2":