diff --git a/package.json b/package.json
index 3126bae..a040fe1 100644
--- a/package.json
+++ b/package.json
@@ -62,7 +62,7 @@
     "ember-load-initializers": "^2.1.2",
     "ember-qunit": "^5.1.4",
     "ember-resolver": "^8.0.2",
-    "ember-source": "^3.27.5",
+    "ember-source": "^3.28.4",
     "ember-source-channel-url": "^3.0.0",
     "ember-template-lint": "^3.5.1",
     "ember-try": "^1.4.0",
diff --git a/yarn.lock b/yarn.lock
index b6f379b..101acb3 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1364,10 +1364,10 @@
   resolved "https://registry.yarnpkg.com/@glimmer/validator/-/validator-0.44.0.tgz#03d127097dc9cb23052cdb7fcae59d0a9dca53e1"
   integrity sha512-i01plR0EgFVz69GDrEuFgq1NheIjZcyTy3c7q+w7d096ddPVeVcRzU3LKaqCfovvLJ+6lJx40j45ecycASUUyw==
 
-"@glimmer/vm-babel-plugins@0.78.2":
-  version "0.78.2"
-  resolved "https://registry.yarnpkg.com/@glimmer/vm-babel-plugins/-/vm-babel-plugins-0.78.2.tgz#b530a19f54da385c7099a22cf348e9062d186838"
-  integrity sha512-GSEf16h6OCtKx7PsSvD21cLXZuVc6swW2rSOAvfLeZco1DEWMRgYTwkCkColydKZcQ3gvwbPBeYwTC2K6tlnjg==
+"@glimmer/vm-babel-plugins@0.80.3":
+  version "0.80.3"
+  resolved "https://registry.yarnpkg.com/@glimmer/vm-babel-plugins/-/vm-babel-plugins-0.80.3.tgz#434b62172318cac43830d3ac29818cf2c5f111c1"
+  integrity sha512-9ej6xlm5MzHBJ5am2l0dbbn8Z0wJoYoMpM8FcrGMlUP6SPMLWxvxpMsApgQo8u6dvZRCjR3/bw3fdf7GOy0AFw==
   dependencies:
     babel-plugin-debug-macros "^0.3.4"
 
@@ -5050,17 +5050,17 @@ ember-source-channel-url@^3.0.0:
   dependencies:
     node-fetch "^2.6.0"
 
-ember-source@^3.27.5:
-  version "3.27.5"
-  resolved "https://registry.yarnpkg.com/ember-source/-/ember-source-3.27.5.tgz#8e9ce24c17e7a16dc3c2b128d3d3e24ea79e6726"
-  integrity sha512-oSGM9mD6BuOcGilYqU+F2MtCferQhKWO3REX1P9qgN1Wzfa5kXjbjBBdPNWfBtg7bZLGM27H8JgiV6+t3uGegA==
+ember-source@^3.28.4:
+  version "3.28.4"
+  resolved "https://registry.yarnpkg.com/ember-source/-/ember-source-3.28.4.tgz#b6ac2b1e369ef533d05164c65078b4ceafdb6390"
+  integrity sha512-s7kVy0E08erAHUTI/8SZZvXt3an/xb2g5K+m4Rybvo8Tr/noMk3lIdtyQkSvmgMZ/BbvoW8spS630sO0/JN4Eg==
   dependencies:
     "@babel/helper-module-imports" "^7.8.3"
     "@babel/plugin-transform-block-scoping" "^7.8.3"
     "@babel/plugin-transform-object-assign" "^7.8.3"
     "@ember/edition-utils" "^1.2.0"
-    "@glimmer/vm-babel-plugins" "0.78.2"
-    babel-plugin-debug-macros "^0.3.3"
+    "@glimmer/vm-babel-plugins" "0.80.3"
+    babel-plugin-debug-macros "^0.3.4"
     babel-plugin-filter-imports "^4.0.0"
     broccoli-concat "^4.2.4"
     broccoli-debug "^0.6.4"