diff --git a/.eslintrc.js b/.eslintrc.js
index bdace1247ab77d..e15c9c6197d333 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -67,13 +67,6 @@ module.exports = {
       {
         patterns: [
           '@mui/*/*/*',
-          // Begin block: Packages with files instead of packages in the top level
-          // Importing from the top level pulls in CommonJS instead of ES modules
-          // Allowing /icons as to reduce cold-start of dev builds significantly.
-          // There's nothing to tree-shake when importing from /icons this way:
-          // '@mui/icons-material/*/',
-          '@mui/utils/*',
-          // End block
           // Macros are fine since their import path is transpiled away
           '!@mui/utils/macros',
           '@mui/utils/macros/*',
@@ -333,7 +326,7 @@ module.exports = {
           'error',
           {
             patterns: [
-              // Allow deeper imports for TypeScript types. TODO?
+              // Allow deeper imports for TypeScript types. TODO remove
               '@mui/*/*/*/*',
               // Macros are fine since they're transpiled into something else
               '!@mui/utils/macros/*.macro',
diff --git a/docs/data/base/components/autocomplete/UseAutocompletePopper.js b/docs/data/base/components/autocomplete/UseAutocompletePopper.js
index b6512af0934b97..8897b328599234 100644
--- a/docs/data/base/components/autocomplete/UseAutocompletePopper.js
+++ b/docs/data/base/components/autocomplete/UseAutocompletePopper.js
@@ -2,7 +2,7 @@ import * as React from 'react';
 import { useAutocomplete } from '@mui/base/useAutocomplete';
 import { Popper } from '@mui/base/Popper';
 import { styled } from '@mui/system';
-import { unstable_useForkRef as useForkRef } from '@mui/utils';
+import useForkRef from '@mui/utils/useForkRef'; // TODO import from @mui/base, private package
 
 const Autocomplete = React.forwardRef(function Autocomplete(props, ref) {
   const {
diff --git a/docs/data/base/components/autocomplete/UseAutocompletePopper.tsx b/docs/data/base/components/autocomplete/UseAutocompletePopper.tsx
index 3b2d59777f5396..174e88c038c654 100644
--- a/docs/data/base/components/autocomplete/UseAutocompletePopper.tsx
+++ b/docs/data/base/components/autocomplete/UseAutocompletePopper.tsx
@@ -2,7 +2,7 @@ import * as React from 'react';
 import { useAutocomplete, UseAutocompleteProps } from '@mui/base/useAutocomplete';
 import { Popper } from '@mui/base/Popper';
 import { styled } from '@mui/system';
-import { unstable_useForkRef as useForkRef } from '@mui/utils';
+import useForkRef from '@mui/utils/useForkRef'; // TODO import from @mui/base, private package
 
 const Autocomplete = React.forwardRef(function Autocomplete(
   props: UseAutocompleteProps<(typeof top100Films)[number], false, false, false>,
diff --git a/packages/mui-base/src/FormControl/FormControl.tsx b/packages/mui-base/src/FormControl/FormControl.tsx
index f5959d15700ab1..ac8d39dcebd98a 100644
--- a/packages/mui-base/src/FormControl/FormControl.tsx
+++ b/packages/mui-base/src/FormControl/FormControl.tsx
@@ -1,7 +1,7 @@
 'use client';
 import * as React from 'react';
 import PropTypes from 'prop-types';
-import { unstable_useControlled as useControlled } from '@mui/utils';
+import useControlled from '@mui/utils/useControlled'; // TODO import from ../useControlled
 import { PolymorphicComponent } from '../utils/PolymorphicComponent';
 import { FormControlContext } from './FormControlContext';
 import { getFormControlUtilityClass } from './formControlClasses';
diff --git a/packages/mui-base/tsconfig.build.json b/packages/mui-base/tsconfig.build.json
index a45de38c5d2fd4..501142bc852849 100644
--- a/packages/mui-base/tsconfig.build.json
+++ b/packages/mui-base/tsconfig.build.json
@@ -11,5 +11,6 @@
     "rootDir": "./src"
   },
   "include": ["src/**/*.ts*"],
-  "exclude": ["src/**/*.spec.ts*", "src/**/*.test.ts*"]
+  "exclude": ["src/**/*.spec.ts*", "src/**/*.test.ts*"],
+  "references": [{ "path": "../mui-utils/tsconfig.build.json" }]
 }
diff --git a/packages/mui-lab/package.json b/packages/mui-lab/package.json
index 1c17af3557ae94..290039d3bed151 100644
--- a/packages/mui-lab/package.json
+++ b/packages/mui-lab/package.json
@@ -65,7 +65,7 @@
     "@mui/system": "^5.14.7",
     "@mui/types": "^7.2.4",
     "@mui/utils": "^5.14.7",
-    "@mui/x-tree-view": "https://pkg.csb.dev/mui/mui-x/commit/1f23b33d/@mui/x-tree-view",
+    "@mui/x-tree-view": "^6.0.0-alpha.1",
     "clsx": "^2.0.0",
     "prop-types": "^15.8.1",
     "react-is": "^18.2.0"
diff --git a/packages/mui-lab/tsconfig.build.json b/packages/mui-lab/tsconfig.build.json
index f3c9573d726cf3..c6951939ebf57c 100644
--- a/packages/mui-lab/tsconfig.build.json
+++ b/packages/mui-lab/tsconfig.build.json
@@ -1,7 +1,7 @@
 {
   // This config is for emitting declarations (.d.ts) only
   // Actual .ts source files are transpiled via babel
-  "extends": "./tsconfig.json",
+  "extends": "./tsconfig",
   "compilerOptions": {
     "noEmit": false,
     "declaration": true,
diff --git a/packages/mui-material/scripts/rollup.config.mjs b/packages/mui-material/scripts/rollup.config.mjs
index eb89d37c285116..7130eceb36e99c 100644
--- a/packages/mui-material/scripts/rollup.config.mjs
+++ b/packages/mui-material/scripts/rollup.config.mjs
@@ -101,6 +101,10 @@ const nestedFolder = {
       return resolveNestedImport('mui-base', importee);
     }
 
+    if (importee.indexOf('@mui/utils/') === 0) {
+      return resolveNestedImport('mui-utils', importee);
+    }
+
     if (importee.indexOf('@mui/private-theming/') === 0) {
       return resolveNestedImport('mui-private-theming', importee);
     }
diff --git a/packages/mui-material/src/ListSubheader/listSubheaderClasses.ts b/packages/mui-material/src/ListSubheader/listSubheaderClasses.ts
index 908966f5d0d709..d8ae4c3f5199ed 100644
--- a/packages/mui-material/src/ListSubheader/listSubheaderClasses.ts
+++ b/packages/mui-material/src/ListSubheader/listSubheaderClasses.ts
@@ -1,4 +1,4 @@
-import { unstable_generateUtilityClasses as generateUtilityClasses } from '@mui/utils';
+import generateUtilityClasses from '@mui/utils/generateUtilityClasses'; // TODO import from @mui/base, private package
 import generateUtilityClass from '../generateUtilityClass';
 
 export interface ListSubheaderClasses {
diff --git a/packages/mui-system/tsconfig.build.json b/packages/mui-system/tsconfig.build.json
index a45de38c5d2fd4..501142bc852849 100644
--- a/packages/mui-system/tsconfig.build.json
+++ b/packages/mui-system/tsconfig.build.json
@@ -11,5 +11,6 @@
     "rootDir": "./src"
   },
   "include": ["src/**/*.ts*"],
-  "exclude": ["src/**/*.spec.ts*", "src/**/*.test.ts*"]
+  "exclude": ["src/**/*.spec.ts*", "src/**/*.test.ts*"],
+  "references": [{ "path": "../mui-utils/tsconfig.build.json" }]
 }
diff --git a/packages/mui-utils/src/integerPropType.d.ts b/packages/mui-utils/src/integerPropType.d.ts
new file mode 100644
index 00000000000000..d884377a0c94b3
--- /dev/null
+++ b/packages/mui-utils/src/integerPropType.d.ts
@@ -0,0 +1,15 @@
+import PropTypes from 'prop-types';
+
+declare function integerPropType(
+  props: { [key: string]: any },
+  propName: string,
+  componentName: string,
+  location: string,
+  propFullName: string,
+): Error | null;
+
+declare module integerPropType {
+  let isRequired: PropTypes.Validator<number>;
+}
+
+export default integerPropType;
diff --git a/packages/mui-utils/tsconfig.build.json b/packages/mui-utils/tsconfig.build.json
index f10360d400e902..649cf77258fe4d 100644
--- a/packages/mui-utils/tsconfig.build.json
+++ b/packages/mui-utils/tsconfig.build.json
@@ -3,6 +3,7 @@
   // Actual .ts source files are transpiled via babel
   "extends": "./tsconfig",
   "compilerOptions": {
+    "composite": true,
     "declaration": true,
     "noEmit": false,
     "emitDeclarationOnly": true,
diff --git a/scripts/buildTypes.mjs b/scripts/buildTypes.mjs
index 66495ecf56b368..4d1ef870ee8918 100644
--- a/scripts/buildTypes.mjs
+++ b/scripts/buildTypes.mjs
@@ -32,6 +32,73 @@ function rewriteImportPath(importPath) {
   throw new Error(`Don't know where to rewrite '${importPath}' to`);
 }
 
+async function rewriteImportPaths(declarationFile, publishDir) {
+  const code = await fse.readFile(declarationFile, { encoding: 'utf8' });
+  const basename = path.basename(declarationFile);
+
+  if (
+    // Only consider React components
+    basename[0] === basename[0].toUpperCase() &&
+    code.indexOf("import PropTypes from 'prop-types';") !== -1
+  ) {
+    throw new Error(
+      [
+        `${declarationFile} imports from 'prop-types', this is wrong.`,
+        "It's likely missing a cast to any on the propTypes declaration:",
+        'ComponentName.propTypes = { /* prop */ } as any;',
+      ].join('\n'),
+    );
+  }
+
+  let fixedCode = code;
+  const changes = [];
+
+  // find all type `import()`
+  // not to be confused with `import type`
+  const importTypeRegExp = /import\(([^)]+)\)/g;
+
+  let importTypeMatch;
+  // eslint-disable-next-line no-cond-assign -- Waiting for RegExp.prototype.matchAll
+  while ((importTypeMatch = importTypeRegExp.exec(code)) !== null) {
+    // First and last character are quotes.
+    // TypeScript mixes single and double quotes.
+    const importPath = importTypeMatch[1].slice(1, -1);
+    // In filesystem semantics `@mui/material` is a relative path.
+    // But when resolving imports these specifiers are considered "bare specifiers" and work differently.
+    // We're only interested in imports that are considered "relative path imports".
+    const isBareImportSpecifier = !importPath.startsWith('.');
+    if (!isBareImportSpecifier) {
+      const resolvedImport = path.resolve(declarationFile, importPath);
+      const importPathFromPublishDir = path.relative(publishDir, resolvedImport);
+      const isImportReachableWhenPublished = !importPathFromPublishDir.startsWith('.');
+
+      if (!isImportReachableWhenPublished) {
+        try {
+          const fixedImportPath = rewriteImportPath(
+            // ensure relative POSIX path
+            importPathFromPublishDir.replace(/\\/g, '/'),
+          );
+          const originalImportType = importTypeMatch[0];
+          const fixedImportType = importTypeMatch[0].replace(importPath, fixedImportPath);
+
+          // Make it easy to visually scan for the created lines.
+          changes.push(`-${chalk.bgRed(originalImportType)}\n+${chalk.bgGreen(fixedImportType)}`);
+          fixedCode = fixedCode.replace(originalImportType, fixedImportType);
+        } catch (error) {
+          throw new Error(`${declarationFile}: ${error}`);
+        }
+      }
+    }
+  }
+
+  const changed = changes.length > 0;
+  if (changed) {
+    await fse.writeFile(declarationFile, fixedCode);
+  }
+
+  return changes;
+}
+
 async function main() {
   const packageRoot = process.cwd();
 
@@ -52,73 +119,6 @@ async function main() {
     throw new Error(`Unable to find declaration files in '${publishDir}'`);
   }
 
-  async function rewriteImportPaths(declarationFile) {
-    const code = await fse.readFile(declarationFile, { encoding: 'utf8' });
-    const basename = path.basename(declarationFile);
-
-    if (
-      // Only consider React components
-      basename[0] === basename[0].toUpperCase() &&
-      code.indexOf("import PropTypes from 'prop-types';") !== -1
-    ) {
-      throw new Error(
-        [
-          `${declarationFile} imports from 'prop-types', this is wrong.`,
-          "It's likely missing a cast to any on the propTypes declaration:",
-          'ComponentName.propTypes = { /* prop */ } as any;',
-        ].join('\n'),
-      );
-    }
-
-    let fixedCode = code;
-    const changes = [];
-
-    // find all type `import()`
-    // not to be confused with `import type`
-    const importTypeRegExp = /import\(([^)]+)\)/g;
-
-    let importTypeMatch;
-    // eslint-disable-next-line no-cond-assign -- Waiting for RegExp.prototype.matchAll
-    while ((importTypeMatch = importTypeRegExp.exec(code)) !== null) {
-      // First and last character are quotes.
-      // TypeScript mixes single and double quotes.
-      const importPath = importTypeMatch[1].slice(1, -1);
-      // In filesystem semantics `@mui/material` is a relative path.
-      // But when resolving imports these specifiers are considered "bare specifiers" and work differently.
-      // We're only interested in imports that are considered "relative path imports".
-      const isBareImportSpecifier = !importPath.startsWith('.');
-      if (!isBareImportSpecifier) {
-        const resolvedImport = path.resolve(declarationFile, importPath);
-        const importPathFromPublishDir = path.relative(publishDir, resolvedImport);
-        const isImportReachableWhenPublished = !importPathFromPublishDir.startsWith('.');
-
-        if (!isImportReachableWhenPublished) {
-          try {
-            const fixedImportPath = rewriteImportPath(
-              // ensure relative POSIX path
-              importPathFromPublishDir.replace(/\\/g, '/'),
-            );
-            const originalImportType = importTypeMatch[0];
-            const fixedImportType = importTypeMatch[0].replace(importPath, fixedImportPath);
-
-            // Make it easy to visually scan for the created lines.
-            changes.push(`-${chalk.bgRed(originalImportType)}\n+${chalk.bgGreen(fixedImportType)}`);
-            fixedCode = fixedCode.replace(originalImportType, fixedImportType);
-          } catch (error) {
-            throw new Error(`${declarationFile}: ${error}`);
-          }
-        }
-      }
-    }
-
-    const changed = changes.length > 0;
-    if (changed) {
-      await fse.writeFile(declarationFile, fixedCode);
-    }
-
-    return changes;
-  }
-
   let rewrittenTally = 0;
   let errorTally = 0;
   await Promise.all(
diff --git a/tsconfig.json b/tsconfig.json
index 7caf992444606a..e78be423ebc0c1 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -33,6 +33,8 @@
       "@mui/types": ["./packages/mui-types"],
       "@mui/base": ["./packages/mui-base/src"],
       "@mui/base/*": ["./packages/mui-base/src/*"],
+      "@mui/utils": ["./packages/mui-utils/src"],
+      "@mui/utils/*": ["./packages/mui-utils/src/*"],
       "@mui/docs": ["./packages/mui-docs/src"],
       "@mui/docs/*": ["./packages/mui-docs/src/*"],
       "@mui/material-next": ["./packages/mui-material-next/src"],
diff --git a/yarn.lock b/yarn.lock
index de59cf0e6fd822..1df78f6726785c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2199,14 +2199,15 @@
     "@babel/runtime" "^7.22.6"
     "@mui/utils" "^5.13.7"
 
-"@mui/x-tree-view@https://pkg.csb.dev/mui/mui-x/commit/1f23b33d/@mui/x-tree-view":
-  version "6.0.0-alpha.0"
-  resolved "https://pkg.csb.dev/mui/mui-x/commit/1f23b33d/@mui/x-tree-view#93cbc61c818ed2d6c40554cdbada969f7dcbaab1"
+"@mui/x-tree-view@^6.0.0-alpha.1":
+  version "6.0.0-alpha.1"
+  resolved "https://registry.yarnpkg.com/@mui/x-tree-view/-/x-tree-view-6.0.0-alpha.1.tgz#fe499f8c43c01d28aca95cfb17491746ffcc3080"
+  integrity sha512-JUG3HmBrmGEALbCFg1b+i7h726e1dWYZs4db3syO1j+Q++E3nbvE4Lehp5yGTFm+8esH0Tny50tuJaa4WX6VSA==
   dependencies:
     "@babel/runtime" "^7.22.6"
-    "@mui/utils" "^5.13.7"
+    "@mui/utils" "^5.14.3"
     "@types/react-transition-group" "^4.4.6"
-    clsx "^1.2.1"
+    clsx "^2.0.0"
     prop-types "^15.8.1"
     react-transition-group "^4.4.5"
 
@@ -5829,7 +5830,7 @@ clone@^1.0.2:
   resolved "https://registry.yarnpkg.com/clone/-/clone-1.0.4.tgz#da309cc263df15994c688ca902179ca3c7cd7c7e"
   integrity sha512-JQHZ2QMW6l3aH/j6xCqQThY/9OH4D/9ls34cgkUBiEeocRTU04tHfKPBsUK1PqZCUQM7GiA0IIXJSuXHI64Kbg==
 
-clsx@^1.1.0, clsx@^1.1.1, clsx@^1.2.1:
+clsx@^1.1.0, clsx@^1.1.1:
   version "1.2.1"
   resolved "https://registry.yarnpkg.com/clsx/-/clsx-1.2.1.tgz#0ddc4a20a549b59c93a4116bb26f5294ca17dc12"
   integrity sha512-EcR6r5a8bj6pu3ycsa/E/cKVGuTgZJZdsyUYHOksG/UHIiKfjxzRxYJpyVBwYaQeOvghal9fcc4PidlgzugAQg==