diff --git a/lerna.json b/lerna.json
index 3aac34c6..cbb822b6 100644
--- a/lerna.json
+++ b/lerna.json
@@ -1,6 +1,6 @@
 {
   "lerna": "2.4.0",
-  "version": "1.1.1",
+  "version": "2.0.0",
   "npmClient": "yarn",
   "registry": "https://registry.npmjs.org/",
   "useWorkspaces": true,
diff --git a/packages/@stimulus/core/package.json b/packages/@stimulus/core/package.json
index 34218edd..10e1e7ca 100644
--- a/packages/@stimulus/core/package.json
+++ b/packages/@stimulus/core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@stimulus/core",
-  "version": "1.1.1",
+  "version": "2.0.0",
   "description": "Stimulus JavaScript framework: Core library",
   "repository": "https://github.com/stimulusjs/stimulus",
   "author": "Basecamp, LLC",
@@ -14,14 +14,14 @@
   "types": "dist/index.d.ts",
   "license": "MIT",
   "dependencies": {
-    "@stimulus/mutation-observers": "^1.1.1"
+    "@stimulus/mutation-observers": "^2.0.0"
   },
   "publishConfig": {
     "access": "public"
   },
   "devDependencies": {
-    "@stimulus/polyfills": "^1.1.1",
-    "@stimulus/test": "^1.1.1"
+    "@stimulus/polyfills": "^2.0.0",
+    "@stimulus/test": "^2.0.0"
   },
   "scripts": {
     "clean": "rimraf dist *.tsbuildinfo"
diff --git a/packages/@stimulus/examples/package.json b/packages/@stimulus/examples/package.json
index e9d41c44..4a11761d 100644
--- a/packages/@stimulus/examples/package.json
+++ b/packages/@stimulus/examples/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@stimulus/examples",
-  "version": "1.1.0",
+  "version": "2.0.0",
   "private": true,
   "dependencies": {
     "@babel/core": "^7.5.5",
diff --git a/packages/@stimulus/multimap/package.json b/packages/@stimulus/multimap/package.json
index 066c2de5..6fe614a4 100644
--- a/packages/@stimulus/multimap/package.json
+++ b/packages/@stimulus/multimap/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@stimulus/multimap",
-  "version": "1.1.1",
+  "version": "2.0.0",
   "description": "Multimap maps one key to a set of many values",
   "repository": "https://github.com/stimulusjs/stimulus",
   "author": "Basecamp, LLC",
diff --git a/packages/@stimulus/mutation-observers/package.json b/packages/@stimulus/mutation-observers/package.json
index 9ae8053b..c98a77cc 100644
--- a/packages/@stimulus/mutation-observers/package.json
+++ b/packages/@stimulus/mutation-observers/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@stimulus/mutation-observers",
-  "version": "1.1.1",
+  "version": "2.0.0",
   "description": "Practical wrappers around DOM MutationObserver",
   "repository": "https://github.com/stimulusjs/stimulus",
   "author": "Basecamp, LLC",
@@ -13,10 +13,10 @@
   "types": "dist/index.d.ts",
   "license": "MIT",
   "dependencies": {
-    "@stimulus/multimap": "^1.1.1"
+    "@stimulus/multimap": "^2.0.0"
   },
   "devDependencies": {
-    "@stimulus/test": "^1.1.1"
+    "@stimulus/test": "^2.0.0"
   },
   "publishConfig": {
     "access": "public"
diff --git a/packages/@stimulus/polyfills/package.json b/packages/@stimulus/polyfills/package.json
index ef1f2287..46cc8f54 100644
--- a/packages/@stimulus/polyfills/package.json
+++ b/packages/@stimulus/polyfills/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@stimulus/polyfills",
-  "version": "1.1.1",
+  "version": "2.0.0",
   "description": "Polyfills to support Stimulus in older browsers",
   "repository": "https://github.com/stimulusjs/stimulus",
   "author": "Basecamp, LLC",
@@ -12,8 +12,8 @@
   "dependencies": {
     "core-js": "^3.4.0",
     "element-closest": "^2.0.2",
-    "mutation-observer-inner-html-shim": "^1.0.0",
-    "eventlistener-polyfill": "^1.0.5"
+    "eventlistener-polyfill": "^1.0.5",
+    "mutation-observer-inner-html-shim": "^1.0.0"
   },
   "publishConfig": {
     "access": "public"
diff --git a/packages/@stimulus/test/package.json b/packages/@stimulus/test/package.json
index 699d46ea..3baf2bc5 100644
--- a/packages/@stimulus/test/package.json
+++ b/packages/@stimulus/test/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@stimulus/test",
-  "version": "1.1.1",
+  "version": "2.0.0",
   "description": "Stimulus JavaScript framework: Test helpers",
   "repository": "https://github.com/stimulusjs/stimulus",
   "author": "Basecamp, LLC",
diff --git a/packages/@stimulus/webpack-helpers/package.json b/packages/@stimulus/webpack-helpers/package.json
index 800d0a17..91ae60d9 100644
--- a/packages/@stimulus/webpack-helpers/package.json
+++ b/packages/@stimulus/webpack-helpers/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@stimulus/webpack-helpers",
-  "version": "1.1.1",
+  "version": "2.0.0",
   "description": "Stimulus JavaScript framework: webpack helpers",
   "repository": "https://github.com/stimulusjs/stimulus",
   "author": "Basecamp, LLC",
diff --git a/packages/stimulus/package.json b/packages/stimulus/package.json
index 36288ca8..3d8f0869 100644
--- a/packages/stimulus/package.json
+++ b/packages/stimulus/package.json
@@ -1,6 +1,6 @@
 {
   "name": "stimulus",
-  "version": "1.1.1",
+  "version": "2.0.0",
   "description": "Stimulus JavaScript framework",
   "repository": "https://github.com/stimulusjs/stimulus",
   "author": "Basecamp, LLC",
@@ -13,8 +13,8 @@
   "module": "index.js",
   "license": "MIT",
   "dependencies": {
-    "@stimulus/core": "^1.1.1",
-    "@stimulus/webpack-helpers": "^1.1.1"
+    "@stimulus/core": "^2.0.0",
+    "@stimulus/webpack-helpers": "^2.0.0"
   },
   "scripts": {
     "prepack": "cp ../../README.md .",