diff --git a/package.json b/package.json
index 73e2f50de71..16b59938e25 100644
--- a/package.json
+++ b/package.json
@@ -74,14 +74,14 @@
   },
   "devDependencies": {
     "@babel/preset-env": "^7.9.0",
-    "@glimmer/compiler": "0.38.5-alpha.5",
+    "@glimmer/compiler": "0.38.5-alpha.6",
     "@glimmer/env": "^0.1.7",
-    "@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",
+    "@glimmer/interfaces": "0.38.5-alpha.6",
+    "@glimmer/node": "0.38.5-alpha.6",
+    "@glimmer/opcode-compiler": "0.38.5-alpha.6",
+    "@glimmer/program": "0.38.5-alpha.6",
+    "@glimmer/reference": "0.38.5-alpha.6",
+    "@glimmer/runtime": "0.38.5-alpha.6",
     "@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 e3e47166dc5..ce81c49c650 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -847,122 +847,122 @@
   resolved "https://registry.yarnpkg.com/@ember/edition-utils/-/edition-utils-1.2.0.tgz#a039f542dc14c8e8299c81cd5abba95e2459cfa6"
   integrity sha512-VmVq/8saCaPdesQmftPqbFtxJWrzxNGSQ+e8x8LLe3Hjm36pJ04Q8LeORGZkAeOhldoUX9seLGmSaHeXkIqoog==
 
-"@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==
+"@glimmer/compiler@0.38.5-alpha.6":
+  version "0.38.5-alpha.6"
+  resolved "https://registry.yarnpkg.com/@glimmer/compiler/-/compiler-0.38.5-alpha.6.tgz#7824e4c61d843bfd98d395df556852d775a607ae"
+  integrity sha512-WnVv+TyunT6/8ug0JizDCu2EgyqIiju/BX3VVUKAMY9qNQFP7zGRs+qqatATUpvuKxDdTexCJUoqE/X9J2OR6w==
   dependencies:
-    "@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/interfaces" "^0.38.5-alpha.6"
+    "@glimmer/syntax" "^0.38.5-alpha.6"
+    "@glimmer/util" "^0.38.5-alpha.6"
+    "@glimmer/wire-format" "^0.38.5-alpha.6"
 
-"@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==
+"@glimmer/encoder@^0.38.5-alpha.6":
+  version "0.38.5-alpha.6"
+  resolved "https://registry.yarnpkg.com/@glimmer/encoder/-/encoder-0.38.5-alpha.6.tgz#83d62110701cebc2b17f9d75f2ef4ad13e9172b9"
+  integrity sha512-5I1KOTmaKLxOk0bTrF6LPPvBaBPCX9IM+40krhRexUtcUgK7A2U5LSUeId7jwQ6SzJUnm21ODiTnr1jYCPIitg==
   dependencies:
-    "@glimmer/interfaces" "^0.38.5-alpha.5"
-    "@glimmer/vm" "^0.38.5-alpha.5"
+    "@glimmer/interfaces" "^0.38.5-alpha.6"
+    "@glimmer/vm" "^0.38.5-alpha.6"
 
 "@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.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==
+"@glimmer/interfaces@0.38.5-alpha.6", "@glimmer/interfaces@^0.38.5-alpha.6":
+  version "0.38.5-alpha.6"
+  resolved "https://registry.yarnpkg.com/@glimmer/interfaces/-/interfaces-0.38.5-alpha.6.tgz#419b13203f5266dbcd654a79aaf4f99d7701535c"
+  integrity sha512-Ltv9aWVdf7zFFhWhn8Mbyaty1CZcWJuCha0U9jq+WA+rAB9bujcfYFFi58GwJz4gfy8KGtLZPDzLuLtcrDjENA==
   dependencies:
-    "@glimmer/wire-format" "^0.38.5-alpha.5"
+    "@glimmer/wire-format" "^0.38.5-alpha.6"
     "@simple-dom/interface" "1.4.0"
 
-"@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"
+"@glimmer/low-level@^0.38.5-alpha.6":
+  version "0.38.5-alpha.6"
+  resolved "https://registry.yarnpkg.com/@glimmer/low-level/-/low-level-0.38.5-alpha.6.tgz#189cd21d6c526293b41eaf7f79f58a33369d32a6"
+  integrity sha512-xVy56oEu8ogIrSW2eQJvOaP0sO4kOf11s6WG1CblhM0Sout1u7FbxAtjjyphDEcT+tXvVfB5WK9M+SwgcJAW9Q==
+
+"@glimmer/node@0.38.5-alpha.6":
+  version "0.38.5-alpha.6"
+  resolved "https://registry.yarnpkg.com/@glimmer/node/-/node-0.38.5-alpha.6.tgz#d08e4d580e39a9fd8bdbe5278451600fc3ed7a14"
+  integrity sha512-Cj97i26ZG8si1kZjDtWRVAjaYUDDqb9vtAR0wPlcUVGEXoD/vNaW98wEtSxOxMdtMvCTr2d4/mkmXbzVLmQn5A==
+  dependencies:
+    "@glimmer/interfaces" "^0.38.5-alpha.6"
+    "@glimmer/runtime" "^0.38.5-alpha.6"
+
+"@glimmer/opcode-compiler@0.38.5-alpha.6":
+  version "0.38.5-alpha.6"
+  resolved "https://registry.yarnpkg.com/@glimmer/opcode-compiler/-/opcode-compiler-0.38.5-alpha.6.tgz#bfb82895483636006d78c0c4ca50030218a02d46"
+  integrity sha512-vMLrmV/tXb0z/ciLn0indTCpM8riWGaq49QXRVb/NKpab6o05jEptTUSHqQ6Y6eIRkEVC1Pv7h3/sDz0GATDLQ==
+  dependencies:
+    "@glimmer/encoder" "^0.38.5-alpha.6"
+    "@glimmer/interfaces" "^0.38.5-alpha.6"
+    "@glimmer/program" "^0.38.5-alpha.6"
+    "@glimmer/reference" "^0.38.5-alpha.6"
+    "@glimmer/util" "^0.38.5-alpha.6"
+    "@glimmer/vm" "^0.38.5-alpha.6"
+    "@glimmer/wire-format" "^0.38.5-alpha.6"
+
+"@glimmer/program@0.38.5-alpha.6", "@glimmer/program@^0.38.5-alpha.6":
+  version "0.38.5-alpha.6"
+  resolved "https://registry.yarnpkg.com/@glimmer/program/-/program-0.38.5-alpha.6.tgz#df0e75acd87789b7c4dd81f72fce6ccb51e05180"
+  integrity sha512-ErDLGS6zpc6zIh4so/xRpK+/9ejV9nqgVVCd7bgt9Qc3hUgStG0mQmz1JUlYPW1wVD155agPNyeA2zwoROTpiA==
+  dependencies:
+    "@glimmer/encoder" "^0.38.5-alpha.6"
+    "@glimmer/interfaces" "^0.38.5-alpha.6"
+    "@glimmer/util" "^0.38.5-alpha.6"
+
+"@glimmer/reference@0.38.5-alpha.6", "@glimmer/reference@^0.38.5-alpha.6":
+  version "0.38.5-alpha.6"
+  resolved "https://registry.yarnpkg.com/@glimmer/reference/-/reference-0.38.5-alpha.6.tgz#c2e95100fda05bb6318f5eadf6bbd6b0612108ae"
+  integrity sha512-OaTMvDgQM2Xsv4M4xdQ2NXOfRhiRwXF2cJoJZWjoqnvogd6/qAqbdcWpSF8xpLWO1b3tnr1dASQT7GUaULE4JQ==
+  dependencies:
+    "@glimmer/util" "^0.38.5-alpha.6"
+
+"@glimmer/runtime@0.38.5-alpha.6", "@glimmer/runtime@^0.38.5-alpha.6":
+  version "0.38.5-alpha.6"
+  resolved "https://registry.yarnpkg.com/@glimmer/runtime/-/runtime-0.38.5-alpha.6.tgz#b8c5be7bf1f503b6f0b49fd3e607ef192ce8c365"
+  integrity sha512-nUTUEXcKQOJU0anjdcgLRxe8p8Z0XQFA7mxctCW1FU1mGOvaOszLYu7cKFYXVx8b8e04lFf1D1XBb9AAKGdNCA==
+  dependencies:
+    "@glimmer/interfaces" "^0.38.5-alpha.6"
+    "@glimmer/low-level" "^0.38.5-alpha.6"
+    "@glimmer/program" "^0.38.5-alpha.6"
+    "@glimmer/reference" "^0.38.5-alpha.6"
+    "@glimmer/util" "^0.38.5-alpha.6"
+    "@glimmer/vm" "^0.38.5-alpha.6"
+    "@glimmer/wire-format" "^0.38.5-alpha.6"
     "@simple-dom/interface" "^1.4.0"
 
-"@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==
+"@glimmer/syntax@^0.38.5-alpha.6":
+  version "0.38.5-alpha.6"
+  resolved "https://registry.yarnpkg.com/@glimmer/syntax/-/syntax-0.38.5-alpha.6.tgz#fdec25f27d42c51adafb72f3fa887a2c4a7156a3"
+  integrity sha512-NiyQxSZFA/HUsiYidneufgsYT1uI7olasLVHt5SDOBFPJ6QeexumCFBZqR3ejkiEtfisoiwgMHgKfUL7Jt/u+Q==
   dependencies:
-    "@glimmer/interfaces" "^0.38.5-alpha.5"
-    "@glimmer/util" "^0.38.5-alpha.5"
+    "@glimmer/interfaces" "^0.38.5-alpha.6"
+    "@glimmer/util" "^0.38.5-alpha.6"
     handlebars "^4.0.6"
     simple-html-tokenizer "^0.5.9"
 
-"@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/util@^0.38.5-alpha.6":
+  version "0.38.5-alpha.6"
+  resolved "https://registry.yarnpkg.com/@glimmer/util/-/util-0.38.5-alpha.6.tgz#12ba7705e73405cb38f36a5a9299bbf949132c31"
+  integrity sha512-lXnvt3h4kTj6VEgqda64fiyReYKTQvMRcuTkKRE1XLh5a4VbN/ppraJf8ZVfv2uVzAcsSPfi3Ju2mrh4d6QYdg==
 
-"@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==
+"@glimmer/vm@^0.38.5-alpha.6":
+  version "0.38.5-alpha.6"
+  resolved "https://registry.yarnpkg.com/@glimmer/vm/-/vm-0.38.5-alpha.6.tgz#ee7207e3484285fc17fd406be6a9f2da4c55671b"
+  integrity sha512-aAcQXn2y0hcgmSib2MNZuYVlZo3cPD/A+ntaguMxOTFienYetO2taCxvHsGy7G+FQIaVGVGKJF57KSnEuSLRAQ==
   dependencies:
-    "@glimmer/interfaces" "^0.38.5-alpha.5"
-    "@glimmer/util" "^0.38.5-alpha.5"
+    "@glimmer/interfaces" "^0.38.5-alpha.6"
+    "@glimmer/util" "^0.38.5-alpha.6"
 
-"@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==
+"@glimmer/wire-format@^0.38.5-alpha.6":
+  version "0.38.5-alpha.6"
+  resolved "https://registry.yarnpkg.com/@glimmer/wire-format/-/wire-format-0.38.5-alpha.6.tgz#ca990f47d1034313462c2d84cbd9edb60a3a049a"
+  integrity sha512-TxtQxK2PikfI9nMMR4xuuxUPwHUuIpigywVYQiPlw8BU5BtLXSSRlNXKKfTzVJOrOW/94FakW0kPrJSSVi/zYg==
   dependencies:
-    "@glimmer/util" "^0.38.5-alpha.5"
+    "@glimmer/util" "^0.38.5-alpha.6"
 
 "@simple-dom/document@^1.4.0":
   version "1.4.0"