diff --git a/.changeset/pre.json b/.changeset/pre.json
index 461875c7499..5cdd6e4df95 100644
--- a/.changeset/pre.json
+++ b/.changeset/pre.json
@@ -4,5 +4,18 @@
   "initialVersions": {
     "@apollo/client": "3.12.2"
   },
-  "changesets": []
+  "changesets": [
+    "chatty-planes-grin",
+    "clever-zebras-mate",
+    "fluffy-shoes-applaud",
+    "hot-cycles-notice",
+    "itchy-drinks-refuse",
+    "moody-lobsters-listen",
+    "popular-games-sleep",
+    "shiny-carrots-invent",
+    "short-jokes-jam",
+    "tall-cups-suffer",
+    "yellow-cats-judge",
+    "young-turtles-explode"
+  ]
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index fb62dad7b77..67239d40253 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,77 @@
 # @apollo/client
 
+## 4.0.0-alpha.0
+
+### Major Changes
+
+- [#12222](https://github.com/apollographql/apollo-client/pull/12222) [`d1a9054`](https://github.com/apollographql/apollo-client/commit/d1a905461d4378522c3257de00afba2ae8decd22) Thanks [@jerelmiller](https://github.com/jerelmiller)! - Drop support for React 16.
+
+- [#12224](https://github.com/apollographql/apollo-client/pull/12224) [`51e6c0f`](https://github.com/apollographql/apollo-client/commit/51e6c0f8657d20cedc570c6e9a244f877047dd61) Thanks [@jerelmiller](https://github.com/jerelmiller)! - Remove deprecated `partialRefetch` option.
+
+- [#12211](https://github.com/apollographql/apollo-client/pull/12211) [`c2736db`](https://github.com/apollographql/apollo-client/commit/c2736db3ad6f8b6e56f065682d5b76614f41bfd4) Thanks [@jerelmiller](https://github.com/jerelmiller)! - Remove the deprecated `graphql`, `withQuery`, `withMutation`, `withSubscription`, and `withApollo` hoc components. Use the provided React hooks instead.
+
+- [#12262](https://github.com/apollographql/apollo-client/pull/12262) [`10ef733`](https://github.com/apollographql/apollo-client/commit/10ef7338cdcbbaf75d806f426e9708c9e095c2da) Thanks [@jerelmiller](https://github.com/jerelmiller)! - Remove `itAsync` test utility.
+
+- [#12304](https://github.com/apollographql/apollo-client/pull/12304) [`86469a2`](https://github.com/apollographql/apollo-client/commit/86469a25abb72dbd68adff3554e3909036e77eee) Thanks [@jerelmiller](https://github.com/jerelmiller)! - The `Cache.DiffResult<T>` type is now a union type with better type safety for both complete and partial results. Checking `diff.complete` will now narrow the type of `result` depending on whether the value is `true` or `false`.
+
+  When `true`, `diff.result` will be a non-null value equal to the `T` generic type. When `false`, `diff.result` now reports `result` as `DeepPartial<T> | null` indicating that fields in the result may be missing (`DeepPartial<T>`) or empty entirely (`null`).
+
+- [#12254](https://github.com/apollographql/apollo-client/pull/12254) [`0028ac0`](https://github.com/apollographql/apollo-client/commit/0028ac0147aaea9ab559f15630200a132b43da42) Thanks [@jerelmiller](https://github.com/jerelmiller)! - Changes the default `Accept` header to `application/graphql-response+json`.
+
+- [#12223](https://github.com/apollographql/apollo-client/pull/12223) [`69c1cb6`](https://github.com/apollographql/apollo-client/commit/69c1cb6f831941598987185238a299b050a364bd) Thanks [@jerelmiller](https://github.com/jerelmiller)! - Remove `subscribeAndCount` testing utility from `@apollo/client/testing`.
+
+- [#12300](https://github.com/apollographql/apollo-client/pull/12300) [`4d581e4`](https://github.com/apollographql/apollo-client/commit/4d581e4f5a3c5409e5f06a5f164beabdada150f1) Thanks [@jerelmiller](https://github.com/jerelmiller)! - Moves all React-related exports to the `@apollo/client/react` entrypoint and out of the main `@apollo/client` entrypoint. This prevents the need to install React in order to use the core client.
+
+  The following is a list of exports available in `@apollo/client` that should now import from `@apollo/client/react`.
+
+  - `ApolloConsumer`
+  - `ApolloProvider`
+  - `createQueryPreloader`
+  - `getApolloContext`
+  - `skipToken`
+  - `useApolloClient`
+  - `useBackgroundQuery`
+  - `useFragment`
+  - `useLazyQuery`
+  - `useLoadableQuery`
+  - `useMutation`
+  - `useQuery`
+  - `useQueryRefHandlers`
+  - `useReactiveVar`
+  - `useReadQuery`
+  - `useSubscription`
+  - `useSuspenseQuery`
+
+  The following is a list of exports available in `@apollo/client/testing` that should now import from `@apollo/client/testing/react`:
+
+  - `MockedProvider`
+
+- [#12304](https://github.com/apollographql/apollo-client/pull/12304) [`86469a2`](https://github.com/apollographql/apollo-client/commit/86469a25abb72dbd68adff3554e3909036e77eee) Thanks [@jerelmiller](https://github.com/jerelmiller)! - ### Changes for users of `InMemoryCache`
+
+  `cache.diff` now returns `null` instead of an empty object (`{}`) when `returnPartialData` is `true` and the result is empty.
+
+  If you use `cache.diff` directly with `returnPartialData: true`, you will need to check for `null` before accessing any other fields on the `result` property. A non-null value indicates that at least one field was present in the cache for the given query document.
+
+  ### Changes for third-party cache implementations
+
+  The client now expects `cache.diff` to return `null` instead of an empty object when there is no data that can be fulfilled from the cache and `returnPartialData` is `true`. If your cache implementation returns an empty object, please update this to return `null`.
+
+- [#12304](https://github.com/apollographql/apollo-client/pull/12304) [`86469a2`](https://github.com/apollographql/apollo-client/commit/86469a25abb72dbd68adff3554e3909036e77eee) Thanks [@jerelmiller](https://github.com/jerelmiller)! - ### Changes for users of `InMemoryCache`
+
+  `cache.diff` no longer throws when `returnPartialData` is set to `false` without a complete result. Instead, `cache.diff` will return `null` when it is unable to read a full cache result.
+
+  If you use `cache.diff` directly with `returnPartialData: false`, remove the `try`/`catch` block and replace with a check for `null`.
+
+  ### Changes for third-party cache implementations
+
+  The client now expects `cache.diff` to return `null` instead of throwing when the cache returns an incomplete result and `returnPartialData` is `false`. The internal `try`/`catch` blocks have been removed around `cache.diff`. If your cache implementation throws for incomplete results, please update this to return `null`.
+
+- [#12211](https://github.com/apollographql/apollo-client/pull/12211) [`c2736db`](https://github.com/apollographql/apollo-client/commit/c2736db3ad6f8b6e56f065682d5b76614f41bfd4) Thanks [@jerelmiller](https://github.com/jerelmiller)! - Remove the deprecated `Query`, `Mutation`, and `Subscription` components. Use the provided React hooks instead.
+
+### Patch Changes
+
+- [#12291](https://github.com/apollographql/apollo-client/pull/12291) [`ae5d06a`](https://github.com/apollographql/apollo-client/commit/ae5d06ac45ca6584d3c79aa417dae22f37a7d3b6) Thanks [@phryneas](https://github.com/phryneas)! - Remove deprecated `resetApolloContext` export
+
 ## 3.12.8
 
 ### Patch Changes
diff --git a/package-lock.json b/package-lock.json
index cf751f67a03..5a290867a3c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@apollo/client",
-  "version": "3.12.8",
+  "version": "4.0.0-alpha.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@apollo/client",
-      "version": "3.12.8",
+      "version": "4.0.0-alpha.0",
       "hasInstallScript": true,
       "license": "MIT",
       "dependencies": {
diff --git a/package.json b/package.json
index 7d7328fc59f..aca9ce1e0aa 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@apollo/client",
-  "version": "3.12.8",
+  "version": "4.0.0-alpha.0",
   "description": "A fully-featured caching GraphQL client.",
   "private": true,
   "keywords": [