diff --git a/CHANGELOG.md b/CHANGELOG.md
index 239076310..1ab375e13 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,27 @@
 # Change Log
 
+## v0.20.0
+
+:tada: Since the last release we published an [official extension for VSCode](https://marketplace.visualstudio.com/items?itemName=fimbullinter.vscode-plugin).
+
+:warning: **Breaking Changes:**
+
+* TypeScript v3.0 is no longer officially supported
+
+**Features:**
+
+* `bifrost`: pass names of all linted files to TSLint formatters
+* new rule: `no-useless-destructuring`
+* `no-useless-assertion`: detect redundant `as const` assertions
+* `no-useless-assertion`: stricter checks of literal type assertions in const context (`{ prop: 1 as 1 } as const`)
+* `no-inferred-empty-object`: correctly handle higher order function type inference (type parameter propagation) and unions of call signatures
+
+**Bugfixes:**
+
+* `wotan`: fixed a crash caused by changes to TypeScript's internal API
+* `no-useless-predicate`: fixes false positive with `typeof {} === 'object'`
+* `no-useless-assertion`: don't treat `as const` like `as any`
+
 ## v0.19.0
 
 **Features:**
diff --git a/package.json b/package.json
index 9a1fd99f2..3a60cf861 100644
--- a/package.json
+++ b/package.json
@@ -1,5 +1,5 @@
 {
-  "version": "0.20.0",
+  "version": "0.21.0",
   "private": true,
   "scripts": {
     "clean": "rimraf \"{packages/*/{index,{src,language-service}/**/*,test/*.spec},scripts/!(last-travis-nightly)}.{js?(.map),d.ts}\"",
@@ -26,8 +26,8 @@
   ],
   "dependencies": {
     "@fimbul/disir": "^0.18.0",
-    "@fimbul/valtyr": "^0.19.0",
-    "@fimbul/wotan": "^0.19.0",
+    "@fimbul/valtyr": "^0.20.0",
+    "@fimbul/wotan": "^0.20.0",
     "@octokit/rest": "^16.0.1",
     "@types/chalk": "^2.2.0",
     "@types/cross-spawn": "^6.0.0",
diff --git a/packages/bifrost/package.json b/packages/bifrost/package.json
index 71a82acf7..16296e21e 100644
--- a/packages/bifrost/package.json
+++ b/packages/bifrost/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@fimbul/bifrost",
-  "version": "0.18.0",
+  "version": "0.20.0",
   "description": "Compatibility layer for TSLint rules",
   "main": "src/index",
   "types": "src/index",
@@ -26,7 +26,7 @@
   ],
   "peerDependencies": {
     "tslint": "^5.0.0",
-    "typescript": ">= 3.0.1 || >= 3.3.0-dev || >= 3.4.0-dev"
+    "typescript": ">= 3.1.1 || >= 3.4.0-dev || >= 3.5.0-dev"
   },
   "dependencies": {
     "@fimbul/ymir": "^0.18.0",
diff --git a/packages/heimdall/package.json b/packages/heimdall/package.json
index 3e31f23ae..90a9aa509 100644
--- a/packages/heimdall/package.json
+++ b/packages/heimdall/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@fimbul/heimdall",
-  "version": "0.19.0",
+  "version": "0.20.0",
   "description": "Wotan plugin to load and use TSLint rules and formatters",
   "main": "src/index",
   "types": "src/index",
@@ -26,10 +26,10 @@
     "formatters"
   ],
   "peerDependencies": {
-    "@fimbul/wotan": "^0.19.0"
+    "@fimbul/wotan": "^0.20.0"
   },
   "dependencies": {
-    "@fimbul/bifrost": "^0.18.0",
+    "@fimbul/bifrost": "^0.20.0",
     "inversify": "^5.0.0",
     "tslib": "^1.8.1",
     "tslint": "^5.0.0"
diff --git a/packages/mimir/package.json b/packages/mimir/package.json
index 25cd72d88..4e95b2706 100644
--- a/packages/mimir/package.json
+++ b/packages/mimir/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@fimbul/mimir",
-  "version": "0.19.0",
+  "version": "0.20.0",
   "description": "Core rules of the Fimbullinter project",
   "main": "recommended.yaml",
   "publishConfig": {
@@ -32,6 +32,6 @@
     "tsutils": "^3.8.0"
   },
   "peerDependencies": {
-    "typescript": ">= 3.0.1 || >= 3.3.0-dev || >= 3.4.0-dev"
+    "typescript": ">= 3.1.1 || >= 3.4.0-dev || >= 3.5.0-dev"
   }
 }
diff --git a/packages/valtyr/package.json b/packages/valtyr/package.json
index 3c4527af1..a11f2520c 100644
--- a/packages/valtyr/package.json
+++ b/packages/valtyr/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@fimbul/valtyr",
-  "version": "0.19.0",
+  "version": "0.20.0",
   "description": "Wotan plugin to behave almost like TSLint",
   "author": "Klaus Meinhardt",
   "license": "Apache-2.0",
@@ -30,11 +30,11 @@
     "resolve": "^1.5.0"
   },
   "peerDependencies": {
-    "@fimbul/wotan": "^0.19.0",
-    "typescript": ">= 3.0.1 || >= 3.3.0-dev || >= 3.4.0-dev"
+    "@fimbul/wotan": "^0.20.0",
+    "typescript": ">= 3.1.1 || >= 3.4.0-dev || >= 3.5.0-dev"
   },
   "dependencies": {
-    "@fimbul/bifrost": "^0.18.0",
+    "@fimbul/bifrost": "^0.20.0",
     "inversify": "^5.0.0",
     "tslib": "^1.8.1",
     "tslint": "^5.0.0",
diff --git a/packages/wotan/package.json b/packages/wotan/package.json
index 78b51d568..b412737dd 100644
--- a/packages/wotan/package.json
+++ b/packages/wotan/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@fimbul/wotan",
-  "version": "0.19.0",
+  "version": "0.20.0",
   "description": "Pluggable TypeScript and JavaScript linter",
   "bin": "bin/main.js",
   "publishConfig": {
@@ -40,7 +40,7 @@
     "rimraf": "^2.6.2"
   },
   "dependencies": {
-    "@fimbul/mimir": "^0.19.0",
+    "@fimbul/mimir": "^0.20.0",
     "@fimbul/ymir": "^0.18.0",
     "bind-decorator": "^1.0.11",
     "chalk": "^2.3.0",
@@ -62,6 +62,6 @@
     "tsutils": "^3.6.0"
   },
   "peerDependencies": {
-    "typescript": ">= 3.0.1 || >= 3.3.0-dev || >= 3.4.0-dev"
+    "typescript": ">= 3.1.1 || >= 3.4.0-dev || >= 3.5.0-dev"
   }
 }