diff --git a/.changeset/pre.json b/.changeset/pre.json
index e2ea29bddf..24c79f4c7a 100644
--- a/.changeset/pre.json
+++ b/.changeset/pre.json
@@ -8,5 +8,12 @@
     "react-router-native": "6.4.5",
     "@remix-run/router": "1.0.5"
   },
-  "changesets": []
+  "changesets": [
+    "happy-balloons-buy",
+    "kind-dodos-shop",
+    "new-taxis-stare",
+    "pretty-kiwis-study",
+    "thin-kids-eat",
+    "violet-rules-rest"
+  ]
 }
diff --git a/packages/react-router-dom-v5-compat/CHANGELOG.md b/packages/react-router-dom-v5-compat/CHANGELOG.md
index 46a230d119..4a3eb7e4bb 100644
--- a/packages/react-router-dom-v5-compat/CHANGELOG.md
+++ b/packages/react-router-dom-v5-compat/CHANGELOG.md
@@ -1,5 +1,13 @@
 # `react-router-dom-v5-compat`
 
+## 6.5.0-pre.0
+
+### Patch Changes
+
+- Updated dependencies:
+  - `react-router@6.5.0-pre.0`
+  - `react-router-dom@6.5.0-pre.0`
+
 ## 6.4.5
 
 ### Patch Changes
diff --git a/packages/react-router-dom-v5-compat/package.json b/packages/react-router-dom-v5-compat/package.json
index b1f3a034f9..436b452257 100644
--- a/packages/react-router-dom-v5-compat/package.json
+++ b/packages/react-router-dom-v5-compat/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-router-dom-v5-compat",
-  "version": "6.4.5",
+  "version": "6.5.0-pre.0",
   "description": "Migration path to React Router v6 from v4/5",
   "keywords": [
     "react",
@@ -24,7 +24,7 @@
   "types": "./dist/index.d.ts",
   "dependencies": {
     "history": "^5.3.0",
-    "react-router": "6.4.5"
+    "react-router": "6.5.0-pre.0"
   },
   "peerDependencies": {
     "react": ">=16.8",
diff --git a/packages/react-router-dom/CHANGELOG.md b/packages/react-router-dom/CHANGELOG.md
index 11701d11d2..74140c87f4 100644
--- a/packages/react-router-dom/CHANGELOG.md
+++ b/packages/react-router-dom/CHANGELOG.md
@@ -1,5 +1,13 @@
 # `react-router-dom`
 
+## 6.5.0-pre.0
+
+### Patch Changes
+
+- Updated dependencies:
+  - `react-router@6.5.0-pre.0`
+  - `@remix-run/router@1.1.0-pre.0`
+
 ## 6.4.5
 
 ### Patch Changes
diff --git a/packages/react-router-dom/package.json b/packages/react-router-dom/package.json
index fb8b2e908e..2df1528b2f 100644
--- a/packages/react-router-dom/package.json
+++ b/packages/react-router-dom/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-router-dom",
-  "version": "6.4.5",
+  "version": "6.5.0-pre.0",
   "description": "Declarative routing for React web applications",
   "keywords": [
     "react",
@@ -23,8 +23,8 @@
   "module": "./dist/index.js",
   "types": "./dist/index.d.ts",
   "dependencies": {
-    "@remix-run/router": "1.0.5",
-    "react-router": "6.4.5"
+    "@remix-run/router": "1.1.0-pre.0",
+    "react-router": "6.5.0-pre.0"
   },
   "devDependencies": {
     "react": "^18.2.0",
diff --git a/packages/react-router-native/CHANGELOG.md b/packages/react-router-native/CHANGELOG.md
index da971c2b00..31798595ef 100644
--- a/packages/react-router-native/CHANGELOG.md
+++ b/packages/react-router-native/CHANGELOG.md
@@ -1,5 +1,12 @@
 # `react-router-native`
 
+## 6.5.0-pre.0
+
+### Patch Changes
+
+- Updated dependencies:
+  - `react-router@6.5.0-pre.0`
+
 ## 6.4.5
 
 ### Patch Changes
diff --git a/packages/react-router-native/package.json b/packages/react-router-native/package.json
index 64c9ff5c89..30c7921686 100644
--- a/packages/react-router-native/package.json
+++ b/packages/react-router-native/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-router-native",
-  "version": "6.4.5",
+  "version": "6.5.0-pre.0",
   "description": "Declarative routing for React Native applications",
   "keywords": [
     "react",
@@ -22,7 +22,7 @@
   "types": "./dist/index.d.ts",
   "dependencies": {
     "@ungap/url-search-params": "^0.1.4",
-    "react-router": "6.4.5"
+    "react-router": "6.5.0-pre.0"
   },
   "devDependencies": {
     "react": "^18.2.0",
diff --git a/packages/react-router/CHANGELOG.md b/packages/react-router/CHANGELOG.md
index 758289dd11..bf9c8ebb2a 100644
--- a/packages/react-router/CHANGELOG.md
+++ b/packages/react-router/CHANGELOG.md
@@ -1,5 +1,52 @@
 # `react-router`
 
+## 6.5.0-pre.0
+
+### Minor Changes
+
+- Support for optional path segments ([#9650](https://github.com/remix-run/react-router/pull/9650))
+  - You can now denote optional path segments with a `?` as the last character in a path segment
+  - Optional params examples
+    - `:lang?/about` will get expanded and match:
+      - `/:lang/about`
+      - `/about`
+    - `/multistep/:widget1?/widget2?/widget3?` will get expanded and match:
+      - `/multistep/:widget1/:widget2/:widget3`
+      - `/multistep/:widget1/:widget2`
+      - `/multistep/:widget1`
+      - `/multistep`
+  - Optional static segment example
+    - `/fr?/about` will get expanded and match:
+      - `/fr/about`
+      - `/about`
+
+### Patch Changes
+
+- Stop incorrectly matching on partial named parameters, i.e. `<Route path="prefix-:param">`, to align with how splat parameters work. If you were previously relying on this behavior then it's recommended to extract the static portion of the path at the `useParams` call site: ([#9506](https://github.com/remix-run/react-router/pull/9506))
+
+```jsx
+// Old behavior at URL /prefix-123
+<Route path="prefix-:id" element={<Comp /> }>
+
+function Comp() {
+  let params = useParams(); // { id: '123' }
+  let id = params.id; // "123"
+  ...
+}
+
+// New behavior at URL /prefix-123
+<Route path=":id" element={<Comp /> }>
+
+function Comp() {
+  let params = useParams(); // { id: 'prefix-123' }
+  let id = params.id.replace(/^prefix-/, ''); // "123"
+  ...
+}
+```
+
+- Updated dependencies:
+  - `@remix-run/router@1.1.0-pre.0`
+
 ## 6.4.5
 
 ### Patch Changes
diff --git a/packages/react-router/package.json b/packages/react-router/package.json
index e3047888f5..901d1ed1fd 100644
--- a/packages/react-router/package.json
+++ b/packages/react-router/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-router",
-  "version": "6.4.5",
+  "version": "6.5.0-pre.0",
   "description": "Declarative routing for React",
   "keywords": [
     "react",
@@ -23,7 +23,7 @@
   "module": "./dist/index.js",
   "types": "./dist/index.d.ts",
   "dependencies": {
-    "@remix-run/router": "1.0.5"
+    "@remix-run/router": "1.1.0-pre.0"
   },
   "devDependencies": {
     "react": "^18.2.0"
diff --git a/packages/router/CHANGELOG.md b/packages/router/CHANGELOG.md
index 941d1bb0a8..0fc718304e 100644
--- a/packages/router/CHANGELOG.md
+++ b/packages/router/CHANGELOG.md
@@ -1,5 +1,54 @@
 # `@remix-run/router`
 
+## 1.1.0-pre.0
+
+### Minor Changes
+
+- Support for optional path segments ([#9650](https://github.com/remix-run/react-router/pull/9650))
+  - You can now denote optional path segments with a `?` as the last character in a path segment
+  - Optional params examples
+    - `:lang?/about` will get expanded and match:
+      - `/:lang/about`
+      - `/about`
+    - `/multistep/:widget1?/widget2?/widget3?` will get expanded and match:
+      - `/multistep/:widget1/:widget2/:widget3`
+      - `/multistep/:widget1/:widget2`
+      - `/multistep/:widget1`
+      - `/multistep`
+  - Optional static segment example
+    - `/fr?/about` will get expanded and match:
+      - `/fr/about`
+      - `/about`
+
+### Patch Changes
+
+- Stop incorrectly matching on partial named parameters, i.e. `<Route path="prefix-:param">`, to align with how splat parameters work. If you were previously relying on this behavior then it's recommended to extract the static portion of the path at the `useParams` call site: ([#9506](https://github.com/remix-run/react-router/pull/9506))
+
+```jsx
+// Old behavior at URL /prefix-123
+<Route path="prefix-:id" element={<Comp /> }>
+
+function Comp() {
+  let params = useParams(); // { id: '123' }
+  let id = params.id; // "123"
+  ...
+}
+
+// New behavior at URL /prefix-123
+<Route path=":id" element={<Comp /> }>
+
+function Comp() {
+  let params = useParams(); // { id: 'prefix-123' }
+  let id = params.id.replace(/^prefix-/, ''); // "123"
+  ...
+}
+```
+
+- Fix requests sent to revalidating loaders so they reflect a GET request ([#9660](https://github.com/remix-run/react-router/pull/9660))
+- Persist `headers` on `loader` `request`'s after SSR document `action` request ([#9721](https://github.com/remix-run/react-router/pull/9721))
+- `GET` forms now expose a submission on the loading navigation ([#9695](https://github.com/remix-run/react-router/pull/9695))
+- Fix error boundary tracking for multiple errors bubbling to the same boundary ([#9702](https://github.com/remix-run/react-router/pull/9702))
+
 ## 1.0.5
 
 ### Patch Changes
diff --git a/packages/router/package.json b/packages/router/package.json
index 568161bcd6..1f43fa946b 100644
--- a/packages/router/package.json
+++ b/packages/router/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@remix-run/router",
-  "version": "1.0.5",
+  "version": "1.1.0-pre.0",
   "description": "Nested/Data-driven/Framework-agnostic Routing",
   "keywords": [
     "remix",