diff --git a/.changeset/slow-starfishes-retire.md b/.changeset/slow-starfishes-retire.md
new file mode 100644
index 0000000000..35fc64fa8b
--- /dev/null
+++ b/.changeset/slow-starfishes-retire.md
@@ -0,0 +1,5 @@
+---
+'@backstage/cli': patch
+---
+
+Restrict imports on the form `../../plugins/x/src`
diff --git a/packages/cli/config/eslint.backend.js b/packages/cli/config/eslint.backend.js
index c619df9eee..99767f5d79 100644
--- a/packages/cli/config/eslint.backend.js
+++ b/packages/cli/config/eslint.backend.js
@@ -62,7 +62,10 @@ module.exports = {
       { vars: 'all', args: 'after-used', ignoreRestSiblings: true },
     ],
     // Avoid cross-package imports
-    'no-restricted-imports': [2, { patterns: ['**/../../**/*/src/**'] }],
+    'no-restricted-imports': [
+      2,
+      { patterns: ['**/../../**/*/src/**', '**/../../**/*/src'] },
+    ],
     // Avoid default import from winston as it breaks at runtime
     'no-restricted-syntax': [
       'error',
diff --git a/packages/cli/config/eslint.js b/packages/cli/config/eslint.js
index b8d3d98c8f..2a85c307b0 100644
--- a/packages/cli/config/eslint.js
+++ b/packages/cli/config/eslint.js
@@ -83,7 +83,7 @@ module.exports = {
           ...require('module').builtinModules,
         ],
         // Avoid cross-package imports
-        patterns: ['**/../../**/*/src/**'],
+        patterns: ['**/../../**/*/src/**', '**/../../**/*/src'],
       },
     ],
   },
diff --git a/packages/config/package.json b/packages/config/package.json
index 13b074c620..d165ceb6f6 100644
--- a/packages/config/package.json
+++ b/packages/config/package.json
@@ -33,6 +33,7 @@
     "lodash": "^4.17.21"
   },
   "devDependencies": {
+    "@backstage/test-utils-core": "^0.1.2",
     "@types/jest": "^26.0.7",
     "@types/node": "^14.14.32"
   },
diff --git a/packages/config/src/reader.test.ts b/packages/config/src/reader.test.ts
index 7f3513abf6..0cea80dca1 100644
--- a/packages/config/src/reader.test.ts
+++ b/packages/config/src/reader.test.ts
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { withLogCollector } from '../../test-utils-core/src';
+import { withLogCollector } from '@backstage/test-utils-core';
 import { ConfigReader } from './reader';
 
 const DATA = {
diff --git a/packages/core-components/api-report.md b/packages/core-components/api-report.md
index e987d6b67e..b5c98add13 100644
--- a/packages/core-components/api-report.md
+++ b/packages/core-components/api-report.md
@@ -7,6 +7,7 @@
 
 import { ApiRef } from '@backstage/core-plugin-api';
 import { BackstageIdentityApi } from '@backstage/core-plugin-api';
+import { BackstageTheme } from '@backstage/theme';
 import { Breadcrumbs as Breadcrumbs_2 } from '@material-ui/core';
 import { ButtonProps } from '@material-ui/core';
 import { CardHeaderProps } from '@material-ui/core';
@@ -25,7 +26,6 @@ import { LinkProps as LinkProps_2 } from '@material-ui/core';
 import { LinkProps as LinkProps_3 } from 'react-router-dom';
 import { MaterialTableProps } from '@material-table/core';
 import { NavLinkProps } from 'react-router-dom';
-import { Palette } from '@material-ui/core/styles/createPalette';
 import { ProfileInfoApi } from '@backstage/core-plugin-api';
 import { PropsWithChildren } from 'react';
 import PropTypes from 'prop-types';
diff --git a/packages/core-components/src/layout/ItemCard/ItemCardHeader.tsx b/packages/core-components/src/layout/ItemCard/ItemCardHeader.tsx
index 15a1a7d78b..4dbc5d7c1a 100644
--- a/packages/core-components/src/layout/ItemCard/ItemCardHeader.tsx
+++ b/packages/core-components/src/layout/ItemCard/ItemCardHeader.tsx
@@ -21,7 +21,7 @@ import {
   WithStyles,
 } from '@material-ui/core';
 import React from 'react';
-import { BackstageTheme } from '../../../../theme/src';
+import { BackstageTheme } from '@backstage/theme';
 
 const styles = (theme: BackstageTheme) =>
   createStyles({