diff --git a/package.json b/package.json
index 6696a191168..29da35ea06e 100644
--- a/package.json
+++ b/package.json
@@ -74,14 +74,14 @@
   },
   "devDependencies": {
     "@babel/preset-env": "^7.6.0",
-    "@glimmer/compiler": "0.38.5-alpha.4",
+    "@glimmer/compiler": "0.38.5-alpha.5",
     "@glimmer/env": "^0.1.7",
-    "@glimmer/interfaces": "0.38.5-alpha.4",
-    "@glimmer/node": "0.38.5-alpha.4",
-    "@glimmer/opcode-compiler": "0.38.5-alpha.4",
-    "@glimmer/program": "0.38.5-alpha.4",
-    "@glimmer/reference": "0.38.5-alpha.4",
-    "@glimmer/runtime": "0.38.5-alpha.4",
+    "@glimmer/interfaces": "0.38.5-alpha.5",
+    "@glimmer/node": "0.38.5-alpha.5",
+    "@glimmer/opcode-compiler": "0.38.5-alpha.5",
+    "@glimmer/program": "0.38.5-alpha.5",
+    "@glimmer/reference": "0.38.5-alpha.5",
+    "@glimmer/runtime": "0.38.5-alpha.5",
     "@types/qunit": "^2.5.4",
     "@types/rsvp": "^4.0.3",
     "@typescript-eslint/parser": "^2.7.0",
diff --git a/yarn.lock b/yarn.lock
index 614753b3689..46592eb1a53 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -775,122 +775,122 @@
   resolved "https://registry.yarnpkg.com/@ember/edition-utils/-/edition-utils-1.1.1.tgz#d5732c3da593f202e6e1ac6dbee56a758242403f"
   integrity sha512-GEhri78jdQp/xxPpM6z08KlB0wrHfnfrJ9dmQk7JeQ4XCiMzXsJci7yooQgg/IcTKCM/PxE/IkGCQAo80adMkw==
 
-"@glimmer/compiler@0.38.5-alpha.4":
-  version "0.38.5-alpha.4"
-  resolved "https://registry.yarnpkg.com/@glimmer/compiler/-/compiler-0.38.5-alpha.4.tgz#531fcc5c986dae48a306bcef04c3b8677194559d"
-  integrity sha512-29PPAQjipqGM7uxhuAlK3fyJAcIeLlWZx/Ud00S+FRZUHhyGeoAIonFz/bXsNTLlJEcrizpl6qvu2sQFHMgYiA==
+"@glimmer/compiler@0.38.5-alpha.5":
+  version "0.38.5-alpha.5"
+  resolved "https://registry.yarnpkg.com/@glimmer/compiler/-/compiler-0.38.5-alpha.5.tgz#b2d0146b16f2461297deb56ac7eef9ff456c2bb8"
+  integrity sha512-wVryXx6bZF4UOxiBO92Gf9wHJ3ZXtF1DHPQUz534/9NV1OxFkDaJ6haPkAWsorjl85IoNtKJo9Lg9Pt9H1tBZw==
   dependencies:
-    "@glimmer/interfaces" "^0.38.5-alpha.4"
-    "@glimmer/syntax" "^0.38.5-alpha.4"
-    "@glimmer/util" "^0.38.5-alpha.4"
-    "@glimmer/wire-format" "^0.38.5-alpha.4"
+    "@glimmer/interfaces" "^0.38.5-alpha.5"
+    "@glimmer/syntax" "^0.38.5-alpha.5"
+    "@glimmer/util" "^0.38.5-alpha.5"
+    "@glimmer/wire-format" "^0.38.5-alpha.5"
 
-"@glimmer/encoder@^0.38.5-alpha.4":
-  version "0.38.5-alpha.4"
-  resolved "https://registry.yarnpkg.com/@glimmer/encoder/-/encoder-0.38.5-alpha.4.tgz#98313396d5d24429734221b93d9bff7295e92c96"
-  integrity sha512-pNlIqgT6HJXLnfAMr86oBhjkOxyQns6A/9Y8YbWTsp+/lqITo3hIOVV+rYeyDongUIFmNPBpYgOM0vC9wm5sPA==
+"@glimmer/encoder@^0.38.5-alpha.5":
+  version "0.38.5-alpha.5"
+  resolved "https://registry.yarnpkg.com/@glimmer/encoder/-/encoder-0.38.5-alpha.5.tgz#d596cecd25e0610df19d94aa1fd70f17eb7b97d5"
+  integrity sha512-yHZ9AUIPVKTZKVdMswlrwrcVHIBi3z9V9MH2j1A6hOXEum/MK6zW5bsn0L4L51K4gEQ+kJkzxgHGfsKydkS9ig==
   dependencies:
-    "@glimmer/interfaces" "^0.38.5-alpha.4"
-    "@glimmer/vm" "^0.38.5-alpha.4"
+    "@glimmer/interfaces" "^0.38.5-alpha.5"
+    "@glimmer/vm" "^0.38.5-alpha.5"
 
 "@glimmer/env@^0.1.7":
   version "0.1.7"
   resolved "https://registry.yarnpkg.com/@glimmer/env/-/env-0.1.7.tgz#fd2d2b55a9029c6b37a6c935e8c8871ae70dfa07"
   integrity sha1-/S0rVakCnGs3psk16MiHGucN+gc=
 
-"@glimmer/interfaces@0.38.5-alpha.4", "@glimmer/interfaces@^0.38.5-alpha.4":
-  version "0.38.5-alpha.4"
-  resolved "https://registry.yarnpkg.com/@glimmer/interfaces/-/interfaces-0.38.5-alpha.4.tgz#539c52952f7cc7cdd5baf56d2f58872a94c84145"
-  integrity sha512-DZgg5uq5bXf6mlmumAPk7Z1TJn+K251kecNcN+mK8xSGYUSWvYN31EEJZERvapZhMgf76ylKiJdKvXMcwMDhcg==
+"@glimmer/interfaces@0.38.5-alpha.5", "@glimmer/interfaces@^0.38.5-alpha.5":
+  version "0.38.5-alpha.5"
+  resolved "https://registry.yarnpkg.com/@glimmer/interfaces/-/interfaces-0.38.5-alpha.5.tgz#e33d59d5f5cd98316023ecd62f0585e76614104d"
+  integrity sha512-A+NAfQDVeOG0gWPBCvuDbUz47Q7xwEdrTVA7Z5Dc4B2o5Z3zl8r4ZsEtENv0Lz3gOEO4hb2TI+5YYVz1uD/1Tw==
   dependencies:
-    "@glimmer/wire-format" "^0.38.5-alpha.4"
+    "@glimmer/wire-format" "^0.38.5-alpha.5"
     "@simple-dom/interface" "1.4.0"
 
-"@glimmer/low-level@^0.38.5-alpha.4":
-  version "0.38.5-alpha.4"
-  resolved "https://registry.yarnpkg.com/@glimmer/low-level/-/low-level-0.38.5-alpha.4.tgz#2528dac131dff95c2f401e4f05b27bbf0c6adcf0"
-  integrity sha512-MWRtqZGhQBdmCqQXjqHltJTEtxPqw/xMVPJh0Hj8OdILCldmo7E7uYMUejO7+JmKe/b+IJZH0Pm2+R3ZT5mT6g==
-
-"@glimmer/node@0.38.5-alpha.4":
-  version "0.38.5-alpha.4"
-  resolved "https://registry.yarnpkg.com/@glimmer/node/-/node-0.38.5-alpha.4.tgz#a29aaf9c8a1b73f18298938fdc29ffbea4bcff14"
-  integrity sha512-pPL6E4bo4gbdWjAS68Q1qSudhDLPlB5TpC7dXTlBwYzVXKoZKHoccVT6LuoUYGxeKuSb4adEZV8FRXIy7gfkZQ==
-  dependencies:
-    "@glimmer/interfaces" "^0.38.5-alpha.4"
-    "@glimmer/runtime" "^0.38.5-alpha.4"
-
-"@glimmer/opcode-compiler@0.38.5-alpha.4":
-  version "0.38.5-alpha.4"
-  resolved "https://registry.yarnpkg.com/@glimmer/opcode-compiler/-/opcode-compiler-0.38.5-alpha.4.tgz#b67b7feb683bc11337380541d056937d07e8a45c"
-  integrity sha512-VtwBqLEyAwgE6rDIZ9s0RyZw//OkK0tmHxp4XDKO+RbL3jxxkdNSXXNfN7k0gUvu3810X9rkDNnJdHJvTOWgZQ==
-  dependencies:
-    "@glimmer/encoder" "^0.38.5-alpha.4"
-    "@glimmer/interfaces" "^0.38.5-alpha.4"
-    "@glimmer/program" "^0.38.5-alpha.4"
-    "@glimmer/reference" "^0.38.5-alpha.4"
-    "@glimmer/util" "^0.38.5-alpha.4"
-    "@glimmer/vm" "^0.38.5-alpha.4"
-    "@glimmer/wire-format" "^0.38.5-alpha.4"
-
-"@glimmer/program@0.38.5-alpha.4", "@glimmer/program@^0.38.5-alpha.4":
-  version "0.38.5-alpha.4"
-  resolved "https://registry.yarnpkg.com/@glimmer/program/-/program-0.38.5-alpha.4.tgz#9bf15574e894f1eb0e9da0dad53fd9ffc218502b"
-  integrity sha512-BlJF82FVaDObiuYaK05aZ2RCcGOKbSWbcQgww4QtNhg7I4h6kGV9gSpk4FAhDqBdVv/O+wkzeRlF9k8FRiBjIA==
-  dependencies:
-    "@glimmer/encoder" "^0.38.5-alpha.4"
-    "@glimmer/interfaces" "^0.38.5-alpha.4"
-    "@glimmer/util" "^0.38.5-alpha.4"
-
-"@glimmer/reference@0.38.5-alpha.4", "@glimmer/reference@^0.38.5-alpha.4":
-  version "0.38.5-alpha.4"
-  resolved "https://registry.yarnpkg.com/@glimmer/reference/-/reference-0.38.5-alpha.4.tgz#ac81aa3013d5a73ab01a0a3e6d664c0e9d606dcd"
-  integrity sha512-zswmfnOpoZJUWhqitogfMRY7qDSzBdwmDKrKe0OWypJdQT7z8d4+i4NsL0UQNJLwvlGyOgB0iMrLUOGwS/Yrvg==
-  dependencies:
-    "@glimmer/util" "^0.38.5-alpha.4"
-
-"@glimmer/runtime@0.38.5-alpha.4", "@glimmer/runtime@^0.38.5-alpha.4":
-  version "0.38.5-alpha.4"
-  resolved "https://registry.yarnpkg.com/@glimmer/runtime/-/runtime-0.38.5-alpha.4.tgz#a82ab278eb81d02b85e6aacca9267ed8b64df0b5"
-  integrity sha512-D/G9VkefvZalKyNSSYpTzpU9f95Gd3m4zN0bafCh39i5qxBhYP2tmiOAFGhLU2dRF5C6VZentFN8mSS3gXvVlw==
-  dependencies:
-    "@glimmer/interfaces" "^0.38.5-alpha.4"
-    "@glimmer/low-level" "^0.38.5-alpha.4"
-    "@glimmer/program" "^0.38.5-alpha.4"
-    "@glimmer/reference" "^0.38.5-alpha.4"
-    "@glimmer/util" "^0.38.5-alpha.4"
-    "@glimmer/vm" "^0.38.5-alpha.4"
-    "@glimmer/wire-format" "^0.38.5-alpha.4"
+"@glimmer/low-level@^0.38.5-alpha.5":
+  version "0.38.5-alpha.5"
+  resolved "https://registry.yarnpkg.com/@glimmer/low-level/-/low-level-0.38.5-alpha.5.tgz#482a79920821f77cc7db6c294ffc1f1451dc48a8"
+  integrity sha512-IjPlXSithEoWIWBTQmijihzemJvizlUDNfW9gfscliT9HxJUGl7VzHNVSYCcwDPVmQEkOKZ4U6Fg3Ey9+HTDOA==
+
+"@glimmer/node@0.38.5-alpha.5":
+  version "0.38.5-alpha.5"
+  resolved "https://registry.yarnpkg.com/@glimmer/node/-/node-0.38.5-alpha.5.tgz#9149e4255525836b22626075298c4f9100c7c2ce"
+  integrity sha512-Rvw2n6ltLaO/Wk7PwerA/k35NYO1jmYox6k0enU/HWg3dJq93c0QeXSQssXks95on2MYzQvBCVNAG058IY0g0Q==
+  dependencies:
+    "@glimmer/interfaces" "^0.38.5-alpha.5"
+    "@glimmer/runtime" "^0.38.5-alpha.5"
+
+"@glimmer/opcode-compiler@0.38.5-alpha.5":
+  version "0.38.5-alpha.5"
+  resolved "https://registry.yarnpkg.com/@glimmer/opcode-compiler/-/opcode-compiler-0.38.5-alpha.5.tgz#0cd95d782e8900dbbc1f6a3b52aada3e8af7136c"
+  integrity sha512-T6rLluFUome//U87qH+0lu/uBn2435rhbid01yrt4yLwqCr3N9N9hSttJiW/nIkrcQT2LCnVsf4gVR/qRLCnIQ==
+  dependencies:
+    "@glimmer/encoder" "^0.38.5-alpha.5"
+    "@glimmer/interfaces" "^0.38.5-alpha.5"
+    "@glimmer/program" "^0.38.5-alpha.5"
+    "@glimmer/reference" "^0.38.5-alpha.5"
+    "@glimmer/util" "^0.38.5-alpha.5"
+    "@glimmer/vm" "^0.38.5-alpha.5"
+    "@glimmer/wire-format" "^0.38.5-alpha.5"
+
+"@glimmer/program@0.38.5-alpha.5", "@glimmer/program@^0.38.5-alpha.5":
+  version "0.38.5-alpha.5"
+  resolved "https://registry.yarnpkg.com/@glimmer/program/-/program-0.38.5-alpha.5.tgz#4af197fbf4f8546efc8339b8427d0156c6dba074"
+  integrity sha512-9Pww06p+soiZ9Kvy5L0caGCXpoSbpZHvc3Tk25HYmHMjnODA3INnJ4eLV0OQuvyq+xpVZPdqE8TFw8jdGBaiMA==
+  dependencies:
+    "@glimmer/encoder" "^0.38.5-alpha.5"
+    "@glimmer/interfaces" "^0.38.5-alpha.5"
+    "@glimmer/util" "^0.38.5-alpha.5"
+
+"@glimmer/reference@0.38.5-alpha.5", "@glimmer/reference@^0.38.5-alpha.5":
+  version "0.38.5-alpha.5"
+  resolved "https://registry.yarnpkg.com/@glimmer/reference/-/reference-0.38.5-alpha.5.tgz#674fe344bf6cf64468e82560318b411b73e9af9b"
+  integrity sha512-jH/zqiX+tASfoQsnQzzPp1HeKR37D/QltJA1r1Nag1YOfPlydZjzUPxx3GRC+SR3uVFXweo49nLSH3B+82og/Q==
+  dependencies:
+    "@glimmer/util" "^0.38.5-alpha.5"
+
+"@glimmer/runtime@0.38.5-alpha.5", "@glimmer/runtime@^0.38.5-alpha.5":
+  version "0.38.5-alpha.5"
+  resolved "https://registry.yarnpkg.com/@glimmer/runtime/-/runtime-0.38.5-alpha.5.tgz#37971a8b46ef16428b000b1291c136f45e35b06a"
+  integrity sha512-OahZTFfAhYpui886MPZ0z3KAKVFHhjjIB4zBjkKNDWZ1TXvTCne0YdiMhnLzc94m2sJ/LNmOqDMzgB8MF4DrbQ==
+  dependencies:
+    "@glimmer/interfaces" "^0.38.5-alpha.5"
+    "@glimmer/low-level" "^0.38.5-alpha.5"
+    "@glimmer/program" "^0.38.5-alpha.5"
+    "@glimmer/reference" "^0.38.5-alpha.5"
+    "@glimmer/util" "^0.38.5-alpha.5"
+    "@glimmer/vm" "^0.38.5-alpha.5"
+    "@glimmer/wire-format" "^0.38.5-alpha.5"
     "@simple-dom/interface" "^1.4.0"
 
-"@glimmer/syntax@^0.38.5-alpha.4":
-  version "0.38.5-alpha.4"
-  resolved "https://registry.yarnpkg.com/@glimmer/syntax/-/syntax-0.38.5-alpha.4.tgz#95352c1732827080630c454a94d105d3368e8bcc"
-  integrity sha512-i7ODFOhFE1RIfYMMBVlcDLAW1ycb+lNyoEdzhNAqbQLXl+E9BmbJ+HHJAKvmA6w2kgllQ5weXLhrn4ITkVohiA==
+"@glimmer/syntax@^0.38.5-alpha.5":
+  version "0.38.5-alpha.5"
+  resolved "https://registry.yarnpkg.com/@glimmer/syntax/-/syntax-0.38.5-alpha.5.tgz#a4c6f246b1c930bbfe657e3fa6da921192722054"
+  integrity sha512-ZdbVKeCYD7oTRQqQcj7kvD7PZ5iVgzG0xWkKs6K/LGjKnlODReEHlIPWXydu/bAEaDjmCH8hjlQlsxt4mzLvCg==
   dependencies:
-    "@glimmer/interfaces" "^0.38.5-alpha.4"
-    "@glimmer/util" "^0.38.5-alpha.4"
+    "@glimmer/interfaces" "^0.38.5-alpha.5"
+    "@glimmer/util" "^0.38.5-alpha.5"
     handlebars "^4.0.6"
-    simple-html-tokenizer "^0.5.8"
+    simple-html-tokenizer "^0.5.9"
 
-"@glimmer/util@^0.38.5-alpha.4":
-  version "0.38.5-alpha.4"
-  resolved "https://registry.yarnpkg.com/@glimmer/util/-/util-0.38.5-alpha.4.tgz#8d858049aaa87b03da84b73ae163ef2935b39114"
-  integrity sha512-pOJX72PgvKFw9PVjtOKlrtPJ6QEY5xfSXvvX7zCBZoJevGhN+saasan/kDy9Kj7sQjicSOCkbK16WxX3LSV1ZQ==
+"@glimmer/util@^0.38.5-alpha.5":
+  version "0.38.5-alpha.5"
+  resolved "https://registry.yarnpkg.com/@glimmer/util/-/util-0.38.5-alpha.5.tgz#d2bb691aa0d8dc80a9cf7e4a0877c40dace8631f"
+  integrity sha512-/8UtYiEKSfcNoGxrcfspFl4wRrfNHkTu6iZiFAgrcW7CbaSX7LLp6ouJVbvpFTfSrIIMcDu0cSPgo59cKDN1vA==
 
-"@glimmer/vm@^0.38.5-alpha.4":
-  version "0.38.5-alpha.4"
-  resolved "https://registry.yarnpkg.com/@glimmer/vm/-/vm-0.38.5-alpha.4.tgz#ae03429ba001a703e1b9ebbbbeb9b635966afa8d"
-  integrity sha512-7lWC0c9qgl7NfcT6eqDplfsH/yT3yHbwKwuf2LyRotIUK20jKklBNrzfEqIzsMDHn9qK/fLpJPeCuS7vZAamYg==
+"@glimmer/vm@^0.38.5-alpha.5":
+  version "0.38.5-alpha.5"
+  resolved "https://registry.yarnpkg.com/@glimmer/vm/-/vm-0.38.5-alpha.5.tgz#1f46726134de3e07aed2c33b68ec3614e93e27f4"
+  integrity sha512-Ri8WimEtfPyM/Ur+elHqGT0ZQvKRYUZ/TykqInN0ZIm1hf0UPnF/naCoHJnSvBjHSFzqziPCYxCfo9sE2UBK9A==
   dependencies:
-    "@glimmer/interfaces" "^0.38.5-alpha.4"
-    "@glimmer/util" "^0.38.5-alpha.4"
+    "@glimmer/interfaces" "^0.38.5-alpha.5"
+    "@glimmer/util" "^0.38.5-alpha.5"
 
-"@glimmer/wire-format@^0.38.5-alpha.4":
-  version "0.38.5-alpha.4"
-  resolved "https://registry.yarnpkg.com/@glimmer/wire-format/-/wire-format-0.38.5-alpha.4.tgz#91c173371c5e7cd77f2fc3d32c92c70ddfc81da5"
-  integrity sha512-mS1RW6eIT++BOox++i2VJ6w7z62MdPUnvcCGHtT9V1lmnxB0eJEtdKx+i/wV7F8+L4PkbKsc3BblWGEg+Ut9cw==
+"@glimmer/wire-format@^0.38.5-alpha.5":
+  version "0.38.5-alpha.5"
+  resolved "https://registry.yarnpkg.com/@glimmer/wire-format/-/wire-format-0.38.5-alpha.5.tgz#b8e00950dae19c377d0fdd269be3687b1bed0619"
+  integrity sha512-mXbWv62rryHo+7L3Iiovi1byYE7v0BCSdKPovvH+UocVHIIlnFKtljHo89h53iAOGLuiasJhU7HpZTl6b6Qj+Q==
   dependencies:
-    "@glimmer/util" "^0.38.5-alpha.4"
+    "@glimmer/util" "^0.38.5-alpha.5"
 
 "@simple-dom/document@^1.4.0":
   version "1.4.0"
@@ -7486,10 +7486,10 @@ simple-dom@^1.4.0:
     "@simple-dom/serializer" "^1.4.0"
     "@simple-dom/void-map" "^1.4.0"
 
-simple-html-tokenizer@^0.5.8:
-  version "0.5.8"
-  resolved "https://registry.yarnpkg.com/simple-html-tokenizer/-/simple-html-tokenizer-0.5.8.tgz#3417382f75954ee34515cc4fd32d9918e693f173"
-  integrity sha512-0Sq4FvLlQEQODVA6PH2MIrc7tzYO0KT2HzzwvaVLYClWgIsuvaNUOrhrAvTi1pZHrcq7GDB4WiI3ukjqBMxcGQ==
+simple-html-tokenizer@^0.5.9:
+  version "0.5.9"
+  resolved "https://registry.yarnpkg.com/simple-html-tokenizer/-/simple-html-tokenizer-0.5.9.tgz#1a83fe97f5a3e39b335fddf71cfe9b0263b581c2"
+  integrity sha512-w/3FEDN94r4JQ9WoYrIr8RqDIPZdyNkdpbK9glFady1CAEyD97XWCv8HFetQO21w81e7h7Nh59iYTyG1mUJftg==
 
 slice-ansi@^2.1.0:
   version "2.1.0"