diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8002750dcd..7330635427 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,21 @@
+## v0.55.2 (2020-07-30)
+
+#### :rocket: Enhancement
+* `@glimmer/bundle-compiler`, `@glimmer/integration-tests`, `@glimmer/interfaces`, `@glimmer/program`, `@glimmer/runtime`
+  * [#1122](https://github.com/glimmerjs/glimmer-vm/pull/1122) [Refactor] Use a map to dedupe constants instead of indexOf ([@pzuraq](https://github.com/pzuraq))
+* `@glimmer/runtime`
+  * [#1121](https://github.com/glimmerjs/glimmer-vm/pull/1121) Expose the destroyables on the error thrown by `assertDestroyablesDestroyed` ([@rwjblue](https://github.com/rwjblue))
+
+#### :house: Internal
+* `@glimmer/validator`
+  * [#1120](https://github.com/glimmerjs/glimmer-vm/pull/1120) Fix `MonomorphicTag` type error for downstream consumers ([@dfreeman](https://github.com/dfreeman))
+
+#### Committers: 3
+- Chris Garrett ([@pzuraq](https://github.com/pzuraq))
+- Dan Freeman ([@dfreeman](https://github.com/dfreeman))
+- Robert Jackson ([@rwjblue](https://github.com/rwjblue))
+
+
 ## v0.55.1 (2020-07-26)
 
 #### :bug: Bug Fix
diff --git a/package.json b/package.json
index 8cefb8f3b6..ef3077090f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "glimmer-engine",
-  "version": "0.55.1",
+  "version": "0.55.2",
   "private": true,
   "description": "Glimmer compiles Handlebars templates into document fragments rather than string buffers",
   "repository": {
diff --git a/packages/@glimmer/bundle-compiler/package.json b/packages/@glimmer/bundle-compiler/package.json
index d6ff7d1174..7c9051a884 100644
--- a/packages/@glimmer/bundle-compiler/package.json
+++ b/packages/@glimmer/bundle-compiler/package.json
@@ -1,17 +1,17 @@
 {
   "name": "@glimmer/bundle-compiler",
-  "version": "0.55.1",
+  "version": "0.55.2",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/bundle-compiler",
   "dependencies": {
-    "@glimmer/syntax": "^0.55.1",
-    "@glimmer/util": "^0.55.1",
-    "@glimmer/wire-format": "^0.55.1",
-    "@glimmer/interfaces": "^0.55.1",
-    "@glimmer/program": "^0.55.1",
-    "@glimmer/compiler": "^0.55.1",
-    "@glimmer/opcode-compiler": "^0.55.1"
+    "@glimmer/syntax": "^0.55.2",
+    "@glimmer/util": "^0.55.2",
+    "@glimmer/wire-format": "^0.55.2",
+    "@glimmer/interfaces": "^0.55.2",
+    "@glimmer/program": "^0.55.2",
+    "@glimmer/compiler": "^0.55.2",
+    "@glimmer/opcode-compiler": "^0.55.2"
   },
   "devDependencies": {
-    "@glimmer/runtime": "^0.55.1"
+    "@glimmer/runtime": "^0.55.2"
   }
 }
diff --git a/packages/@glimmer/compiler/package.json b/packages/@glimmer/compiler/package.json
index 0ada53cdf4..ccbef91e5d 100644
--- a/packages/@glimmer/compiler/package.json
+++ b/packages/@glimmer/compiler/package.json
@@ -1,15 +1,15 @@
 {
   "name": "@glimmer/compiler",
-  "version": "0.55.1",
+  "version": "0.55.2",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/compiler",
   "dependencies": {
-    "@glimmer/syntax": "^0.55.1",
-    "@glimmer/util": "^0.55.1",
-    "@glimmer/wire-format": "^0.55.1",
-    "@glimmer/interfaces": "^0.55.1",
+    "@glimmer/syntax": "^0.55.2",
+    "@glimmer/util": "^0.55.2",
+    "@glimmer/wire-format": "^0.55.2",
+    "@glimmer/interfaces": "^0.55.2",
     "@simple-dom/interface": "^1.4.0"
   },
   "devDependencies": {
-    "@glimmer/local-debug-flags": "^0.55.1"
+    "@glimmer/local-debug-flags": "^0.55.2"
   }
 }
diff --git a/packages/@glimmer/debug/package.json b/packages/@glimmer/debug/package.json
index ad2b483b9b..4a755fa8fc 100644
--- a/packages/@glimmer/debug/package.json
+++ b/packages/@glimmer/debug/package.json
@@ -1,13 +1,13 @@
 {
   "name": "@glimmer/debug",
-  "version": "0.55.1",
+  "version": "0.55.2",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/debug",
   "private": true,
   "dependencies": {
-    "@glimmer/interfaces": "^0.55.1",
-    "@glimmer/program": "^0.55.1",
-    "@glimmer/util": "^0.55.1",
-    "@glimmer/vm": "^0.55.1",
+    "@glimmer/interfaces": "^0.55.2",
+    "@glimmer/program": "^0.55.2",
+    "@glimmer/util": "^0.55.2",
+    "@glimmer/vm": "^0.55.2",
     "@simple-dom/interface": "^1.4.0"
   },
   "devDependencies": {
diff --git a/packages/@glimmer/dom-change-list/package.json b/packages/@glimmer/dom-change-list/package.json
index e589ce7182..f653e66a85 100644
--- a/packages/@glimmer/dom-change-list/package.json
+++ b/packages/@glimmer/dom-change-list/package.json
@@ -1,10 +1,10 @@
 {
   "name": "@glimmer/dom-change-list",
-  "version": "0.55.1",
+  "version": "0.55.2",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/dom-change-list",
   "dependencies": {
-    "@glimmer/util": "^0.55.1",
-    "@glimmer/interfaces": "^0.55.1",
+    "@glimmer/util": "^0.55.2",
+    "@glimmer/interfaces": "^0.55.2",
     "@simple-dom/document": "^1.4.0",
     "@simple-dom/interface": "^1.4.0"
   },
diff --git a/packages/@glimmer/encoder/package.json b/packages/@glimmer/encoder/package.json
index 1ef8a5b0e3..9cfdcac9b7 100644
--- a/packages/@glimmer/encoder/package.json
+++ b/packages/@glimmer/encoder/package.json
@@ -1,9 +1,9 @@
 {
   "name": "@glimmer/encoder",
-  "version": "0.55.1",
+  "version": "0.55.2",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/encoder",
   "dependencies": {
-    "@glimmer/interfaces": "^0.55.1",
-    "@glimmer/vm": "^0.55.1"
+    "@glimmer/interfaces": "^0.55.2",
+    "@glimmer/vm": "^0.55.2"
   }
 }
diff --git a/packages/@glimmer/integration-tests/package.json b/packages/@glimmer/integration-tests/package.json
index 78dfd178f9..6283cce433 100644
--- a/packages/@glimmer/integration-tests/package.json
+++ b/packages/@glimmer/integration-tests/package.json
@@ -1,21 +1,21 @@
 {
   "name": "@glimmer/integration-tests",
-  "version": "0.55.1",
+  "version": "0.55.2",
   "private": true,
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/integration-tests",
   "dependencies": {
-    "@glimmer/reference": "^0.55.1",
-    "@glimmer/runtime": "^0.55.1",
-    "@glimmer/syntax": "^0.55.1",
-    "@glimmer/validator": "^0.55.1",
-    "@glimmer/compiler": "^0.55.1",
-    "@glimmer/util": "^0.55.1",
-    "@glimmer/wire-format": "^0.55.1",
-    "@glimmer/interfaces": "^0.55.1",
-    "@glimmer/node": "^0.55.1",
-    "@glimmer/opcode-compiler": "^0.55.1",
-    "@glimmer/program": "^0.55.1",
-    "@glimmer/bundle-compiler": "^0.55.1",
+    "@glimmer/reference": "^0.55.2",
+    "@glimmer/runtime": "^0.55.2",
+    "@glimmer/syntax": "^0.55.2",
+    "@glimmer/validator": "^0.55.2",
+    "@glimmer/compiler": "^0.55.2",
+    "@glimmer/util": "^0.55.2",
+    "@glimmer/wire-format": "^0.55.2",
+    "@glimmer/interfaces": "^0.55.2",
+    "@glimmer/node": "^0.55.2",
+    "@glimmer/opcode-compiler": "^0.55.2",
+    "@glimmer/program": "^0.55.2",
+    "@glimmer/bundle-compiler": "^0.55.2",
     "@simple-dom/document": "^1.4.0",
     "@simple-dom/interface": "^1.4.0",
     "@simple-dom/serializer": "^1.4.0",
diff --git a/packages/@glimmer/interfaces/package.json b/packages/@glimmer/interfaces/package.json
index 7227936e14..6b476813ea 100644
--- a/packages/@glimmer/interfaces/package.json
+++ b/packages/@glimmer/interfaces/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@glimmer/interfaces",
-  "version": "0.55.1",
+  "version": "0.55.2",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/interfaces",
   "dependencies": {
     "@simple-dom/interface": "^1.4.0"
diff --git a/packages/@glimmer/local-debug-flags/package.json b/packages/@glimmer/local-debug-flags/package.json
index 058365d701..7879e03953 100644
--- a/packages/@glimmer/local-debug-flags/package.json
+++ b/packages/@glimmer/local-debug-flags/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@glimmer/local-debug-flags",
-  "version": "0.55.1",
+  "version": "0.55.2",
   "description": "Helpers for debugging during local development. These get stripped from published builds. This package should not be published.",
   "private": true
 }
diff --git a/packages/@glimmer/low-level/package.json b/packages/@glimmer/low-level/package.json
index 4b5eeab97f..863638c347 100644
--- a/packages/@glimmer/low-level/package.json
+++ b/packages/@glimmer/low-level/package.json
@@ -1,5 +1,5 @@
 {
   "name": "@glimmer/low-level",
-  "version": "0.55.1",
+  "version": "0.55.2",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/low-level"
 }
diff --git a/packages/@glimmer/node/package.json b/packages/@glimmer/node/package.json
index 4862a09669..d31c8c9962 100644
--- a/packages/@glimmer/node/package.json
+++ b/packages/@glimmer/node/package.json
@@ -1,16 +1,16 @@
 {
   "name": "@glimmer/node",
-  "version": "0.55.1",
+  "version": "0.55.2",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/node",
   "dependencies": {
-    "@glimmer/runtime": "^0.55.1",
-    "@glimmer/interfaces": "^0.55.1",
-    "@glimmer/util": "^0.55.1",
+    "@glimmer/runtime": "^0.55.2",
+    "@glimmer/interfaces": "^0.55.2",
+    "@glimmer/util": "^0.55.2",
     "@simple-dom/document": "^1.4.0",
     "@simple-dom/interface": "^1.4.0"
   },
   "devDependencies": {
     "@types/qunit": "^2.9.0",
-    "@glimmer/compiler": "^0.55.1"
+    "@glimmer/compiler": "^0.55.2"
   }
 }
diff --git a/packages/@glimmer/opcode-compiler/package.json b/packages/@glimmer/opcode-compiler/package.json
index 9fbd7aaa2a..83e9ad524b 100644
--- a/packages/@glimmer/opcode-compiler/package.json
+++ b/packages/@glimmer/opcode-compiler/package.json
@@ -1,18 +1,18 @@
 {
   "name": "@glimmer/opcode-compiler",
-  "version": "0.55.1",
+  "version": "0.55.2",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/opcode-compiler",
   "dependencies": {
-    "@glimmer/util": "^0.55.1",
-    "@glimmer/wire-format": "^0.55.1",
-    "@glimmer/interfaces": "^0.55.1",
-    "@glimmer/program": "^0.55.1",
-    "@glimmer/vm": "^0.55.1",
-    "@glimmer/encoder": "^0.55.1",
-    "@glimmer/reference": "^0.55.1"
+    "@glimmer/util": "^0.55.2",
+    "@glimmer/wire-format": "^0.55.2",
+    "@glimmer/interfaces": "^0.55.2",
+    "@glimmer/program": "^0.55.2",
+    "@glimmer/vm": "^0.55.2",
+    "@glimmer/encoder": "^0.55.2",
+    "@glimmer/reference": "^0.55.2"
   },
   "devDependencies": {
-    "@glimmer/debug": "^0.55.1",
-    "@glimmer/local-debug-flags": "^0.55.1"
+    "@glimmer/debug": "^0.55.2",
+    "@glimmer/local-debug-flags": "^0.55.2"
   }
 }
diff --git a/packages/@glimmer/program/package.json b/packages/@glimmer/program/package.json
index dd94e0d8a9..acdbdde902 100644
--- a/packages/@glimmer/program/package.json
+++ b/packages/@glimmer/program/package.json
@@ -1,13 +1,13 @@
 {
   "name": "@glimmer/program",
-  "version": "0.55.1",
+  "version": "0.55.2",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/program",
   "dependencies": {
-    "@glimmer/util": "^0.55.1",
-    "@glimmer/interfaces": "^0.55.1",
-    "@glimmer/encoder": "^0.55.1"
+    "@glimmer/util": "^0.55.2",
+    "@glimmer/interfaces": "^0.55.2",
+    "@glimmer/encoder": "^0.55.2"
   },
   "devDependencies": {
-    "@glimmer/local-debug-flags": "^0.55.1"
+    "@glimmer/local-debug-flags": "^0.55.2"
   }
 }
diff --git a/packages/@glimmer/reference/package.json b/packages/@glimmer/reference/package.json
index 08dbe03b06..b8ad584d98 100644
--- a/packages/@glimmer/reference/package.json
+++ b/packages/@glimmer/reference/package.json
@@ -1,12 +1,12 @@
 {
   "name": "@glimmer/reference",
-  "version": "0.55.1",
+  "version": "0.55.2",
   "description": "Objects used to track values and their dirtiness in Glimmer",
   "license": "MIT",
   "dependencies": {
     "@glimmer/env": "^0.1.7",
-    "@glimmer/interfaces": "^0.55.1",
-    "@glimmer/util": "^0.55.1",
-    "@glimmer/validator": "^0.55.1"
+    "@glimmer/interfaces": "^0.55.2",
+    "@glimmer/util": "^0.55.2",
+    "@glimmer/validator": "^0.55.2"
   }
 }
diff --git a/packages/@glimmer/runtime/package.json b/packages/@glimmer/runtime/package.json
index 4d1fa93ae6..7a73a4f899 100644
--- a/packages/@glimmer/runtime/package.json
+++ b/packages/@glimmer/runtime/package.json
@@ -1,25 +1,25 @@
 {
   "name": "@glimmer/runtime",
-  "version": "0.55.1",
+  "version": "0.55.2",
   "description": "Minimal runtime needed to render Glimmer templates",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/runtime",
   "license": "MIT",
   "dependencies": {
     "@glimmer/env": "0.1.7",
-    "@glimmer/low-level": "^0.55.1",
-    "@glimmer/util": "^0.55.1",
-    "@glimmer/reference": "^0.55.1",
-    "@glimmer/validator": "^0.55.1",
-    "@glimmer/wire-format": "^0.55.1",
-    "@glimmer/interfaces": "^0.55.1",
-    "@glimmer/program": "^0.55.1",
-    "@glimmer/vm": "^0.55.1",
+    "@glimmer/low-level": "^0.55.2",
+    "@glimmer/util": "^0.55.2",
+    "@glimmer/reference": "^0.55.2",
+    "@glimmer/validator": "^0.55.2",
+    "@glimmer/wire-format": "^0.55.2",
+    "@glimmer/interfaces": "^0.55.2",
+    "@glimmer/program": "^0.55.2",
+    "@glimmer/vm": "^0.55.2",
     "@simple-dom/interface": "^1.4.0"
   },
   "devDependencies": {
-    "@glimmer/local-debug-flags": "^0.55.1",
-    "@glimmer/opcode-compiler": "^0.55.1",
-    "@glimmer/debug": "^0.55.1",
+    "@glimmer/local-debug-flags": "^0.55.2",
+    "@glimmer/opcode-compiler": "^0.55.2",
+    "@glimmer/debug": "^0.55.2",
     "@types/qunit": "^2.9.0"
   }
 }
diff --git a/packages/@glimmer/syntax/package.json b/packages/@glimmer/syntax/package.json
index f98aa67563..f21e301699 100644
--- a/packages/@glimmer/syntax/package.json
+++ b/packages/@glimmer/syntax/package.json
@@ -1,15 +1,15 @@
 {
   "name": "@glimmer/syntax",
-  "version": "0.55.1",
+  "version": "0.55.2",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/syntax",
   "dependencies": {
     "handlebars": "^4.7.4",
-    "@glimmer/interfaces": "^0.55.1",
-    "@glimmer/util": "^0.55.1",
+    "@glimmer/interfaces": "^0.55.2",
+    "@glimmer/util": "^0.55.2",
     "simple-html-tokenizer": "^0.5.9"
   },
   "devDependencies": {
-    "@glimmer/local-debug-flags": "^0.55.1",
+    "@glimmer/local-debug-flags": "^0.55.2",
     "@types/qunit": "^2.9.0"
   }
 }
diff --git a/packages/@glimmer/util/package.json b/packages/@glimmer/util/package.json
index a2fbf003d3..c4500a6628 100644
--- a/packages/@glimmer/util/package.json
+++ b/packages/@glimmer/util/package.json
@@ -1,16 +1,16 @@
 {
   "name": "@glimmer/util",
-  "version": "0.55.1",
+  "version": "0.55.2",
   "description": "Common utilities used in Glimmer",
   "repository": "https://github.com/tildeio/glimmer/tree/master/packages/@glimmer/util",
   "license": "MIT",
   "dependencies": {
     "@glimmer/env": "0.1.7",
-    "@glimmer/interfaces": "^0.55.1",
+    "@glimmer/interfaces": "^0.55.2",
     "@simple-dom/interface": "^1.4.0"
   },
   "devDependencies": {
-    "@glimmer/local-debug-flags": "^0.55.1",
+    "@glimmer/local-debug-flags": "^0.55.2",
     "@types/qunit": "^2.9.0",
     "@simple-dom/interface": "^1.4.0"
   },
diff --git a/packages/@glimmer/validator/package.json b/packages/@glimmer/validator/package.json
index b50f1cbaff..0f65095e26 100644
--- a/packages/@glimmer/validator/package.json
+++ b/packages/@glimmer/validator/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@glimmer/validator",
-  "version": "0.55.1",
+  "version": "0.55.2",
   "description": "Objects used to track values and their dirtiness in Glimmer",
   "license": "MIT",
   "dependencies": {
diff --git a/packages/@glimmer/vm/package.json b/packages/@glimmer/vm/package.json
index 9a7821f080..c89c97776f 100644
--- a/packages/@glimmer/vm/package.json
+++ b/packages/@glimmer/vm/package.json
@@ -1,10 +1,10 @@
 {
   "name": "@glimmer/vm",
-  "version": "0.55.1",
+  "version": "0.55.2",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/vm",
   "dependencies": {
-    "@glimmer/util": "^0.55.1",
-    "@glimmer/interfaces": "^0.55.1"
+    "@glimmer/util": "^0.55.2",
+    "@glimmer/interfaces": "^0.55.2"
   },
   "typings": "index.ts"
 }
diff --git a/packages/@glimmer/wire-format/package.json b/packages/@glimmer/wire-format/package.json
index 151c864b5a..f5c02cb990 100644
--- a/packages/@glimmer/wire-format/package.json
+++ b/packages/@glimmer/wire-format/package.json
@@ -1,11 +1,11 @@
 {
   "name": "@glimmer/wire-format",
-  "version": "0.55.1",
+  "version": "0.55.2",
   "description": "",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/wire-format",
   "license": "MIT",
   "dependencies": {
-    "@glimmer/util": "^0.55.1",
-    "@glimmer/interfaces": "^0.55.1"
+    "@glimmer/util": "^0.55.2",
+    "@glimmer/interfaces": "^0.55.2"
   }
 }