diff --git a/plugins/bui-themer/package.json b/plugins/bui-themer/package.json
index 64cad56775..165da9ca0f 100644
--- a/plugins/bui-themer/package.json
+++ b/plugins/bui-themer/package.json
@@ -34,8 +34,8 @@
     "@material-ui/core": "^4.9.13",
     "@material-ui/icons": "^4.9.1",
     "@material-ui/lab": "^4.0.0-alpha.61",
-    "@mui/material": "^7.3.2",
-    "@mui/system": "^7.3.2",
+    "@mui/material": "^5.12.2",
+    "@mui/system": "^5.16.14",
     "react-use": "^17.2.4"
   },
   "peerDependencies": {
diff --git a/plugins/bui-themer/src/components/BuiThemerPage/convertMuiToBuiTheme.test.ts b/plugins/bui-themer/src/components/BuiThemerPage/convertMuiToBuiTheme.test.ts
index 60cb2830ce..b686d2622c 100644
--- a/plugins/bui-themer/src/components/BuiThemerPage/convertMuiToBuiTheme.test.ts
+++ b/plugins/bui-themer/src/components/BuiThemerPage/convertMuiToBuiTheme.test.ts
@@ -215,26 +215,4 @@ describe('convertMuiToBuiTheme', () => {
 
     expect(result.css).toContain('--bui-space: calc(4px * 0.5);');
   });
-
-  it('should handle string-based spacing', () => {
-    const theme = createTheme({
-      spacing: '8px',
-    });
-
-    const result = convertMuiToBuiTheme(theme);
-
-    expect(result.css).toContain('--bui-space: calc(calc(1 * 8px) * 0.5);');
-  });
-
-  it('should handle string-based border radius', () => {
-    const theme = createTheme({
-      shape: {
-        borderRadius: '8px',
-      },
-    });
-
-    const result = convertMuiToBuiTheme(theme);
-
-    expect(result.css).toContain('--bui-radius-3: 8px;');
-  });
 });