diff --git a/scripts/prepare-pyodide.js b/scripts/prepare-pyodide.js
index 64c380e3a7..577b97854f 100644
--- a/scripts/prepare-pyodide.js
+++ b/scripts/prepare-pyodide.js
@@ -14,15 +14,17 @@ const packages = [
 	'seaborn',
 	'pytz',
 	'black',
-	'openai',
-	'openpyxl'
+	'openai'
 ];
 
 // Pure-Python packages whose wheels must be downloaded from PyPI and saved into
 // static/pyodide/ so that the browser can install them offline via micropip.
 // Packages already provided by the Pyodide distribution (click, platformdirs,
 // typing_extensions, etc.) do NOT need to be listed here.
-const pypiPackages = ['black', 'pathspec', 'mypy_extensions', 'pytokens'];
+// Spell them canonically (dashed): that is the only form pyodide resolves lock entries by.
+const pypiPackages = ['black', 'pathspec', 'mypy-extensions', 'pytokens', 'openpyxl', 'et-xmlfile'];
+
+const pypiDepends = { openpyxl: ['et-xmlfile'] };
 
 import { loadPyodide } from 'pyodide';
 import { setGlobalDispatcher, ProxyAgent } from 'undici';
@@ -175,19 +177,18 @@ async function downloadPyPIWheels() {
 		}
 
 		// Inject into pyodide-lock.json so micropip resolves locally
-		const normalizedName = pkg.replace(/-/g, '_');
-		if (!lockData.packages[normalizedName]) {
-			lockData.packages[normalizedName] = {
-				name: normalizedName,
+		if (!lockData.packages[pkg]) {
+			lockData.packages[pkg] = {
+				name: pkg,
 				version: version,
 				file_name: wheel.filename,
 				install_dir: 'site',
 				sha256: wheel.digests?.sha256 || '',
 				package_type: 'package',
-				imports: [normalizedName],
-				depends: []
+				imports: [pkg.replace(/-/g, '_')],
+				depends: pypiDepends[pkg] || []
 			};
-			console.log(`  Added ${normalizedName}==${version} to pyodide-lock.json`);
+			console.log(`  Added ${pkg}==${version} to pyodide-lock.json`);
 		}
 	}
 
diff --git a/src/lib/components/chat/Messages/CodeBlock.svelte b/src/lib/components/chat/Messages/CodeBlock.svelte
index 23ef519ea5..7889592120 100644
--- a/src/lib/components/chat/Messages/CodeBlock.svelte
+++ b/src/lib/components/chat/Messages/CodeBlock.svelte
@@ -233,7 +233,9 @@
 			/\bimport\s+seaborn\b|\bfrom\s+seaborn\b/.test(code) ? 'seaborn' : null,
 			/\bimport\s+sympy\b|\bfrom\s+sympy\b/.test(code) ? 'sympy' : null,
 			/\bimport\s+tiktoken\b|\bfrom\s+tiktoken\b/.test(code) ? 'tiktoken' : null,
-			/\bimport\s+pytz\b|\bfrom\s+pytz\b/.test(code) ? 'pytz' : null
+			/\bimport\s+pytz\b|\bfrom\s+pytz\b/.test(code) ? 'pytz' : null,
+			/\bimport\s+openpyxl\b|\bfrom\s+openpyxl\b/.test(code) ? 'openpyxl' : null,
+			/\.(read|to)_excel\(|\.Excel(Writer|File)\(/.test(code) ? 'openpyxl' : null
 		].filter(Boolean);
 
 		console.log(packages);
diff --git a/src/routes/+layout.svelte b/src/routes/+layout.svelte
index 71221fba94..d23eb89038 100644
--- a/src/routes/+layout.svelte
+++ b/src/routes/+layout.svelte
@@ -311,7 +311,9 @@
 			/\bimport\s+seaborn\b|\bfrom\s+seaborn\b/.test(code) ? 'seaborn' : null,
 			/\bimport\s+sympy\b|\bfrom\s+sympy\b/.test(code) ? 'sympy' : null,
 			/\bimport\s+tiktoken\b|\bfrom\s+tiktoken\b/.test(code) ? 'tiktoken' : null,
-			/\bimport\s+pytz\b|\bfrom\s+pytz\b/.test(code) ? 'pytz' : null
+			/\bimport\s+pytz\b|\bfrom\s+pytz\b/.test(code) ? 'pytz' : null,
+			/\bimport\s+openpyxl\b|\bfrom\s+openpyxl\b/.test(code) ? 'openpyxl' : null,
+			/\.(read|to)_excel\(|\.Excel(Writer|File)\(/.test(code) ? 'openpyxl' : null
 		].filter(Boolean);
 
 		const worker = getOrCreateWorker();
diff --git a/static/pyodide/pyodide-lock.json b/static/pyodide/pyodide-lock.json
index a29df9c9ce..192f49b42b 100644
--- a/static/pyodide/pyodide-lock.json
+++ b/static/pyodide/pyodide-lock.json
@@ -5131,8 +5131,8 @@
       ],
       "depends": []
     },
-    "mypy_extensions": {
-      "name": "mypy_extensions",
+    "mypy-extensions": {
+      "name": "mypy-extensions",
       "version": "1.1.0",
       "file_name": "mypy_extensions-1.1.0-py3-none-any.whl",
       "install_dir": "site",
@@ -5154,6 +5154,32 @@
         "pytokens"
       ],
       "depends": []
+    },
+    "openpyxl": {
+      "name": "openpyxl",
+      "version": "3.1.5",
+      "file_name": "openpyxl-3.1.5-py2.py3-none-any.whl",
+      "install_dir": "site",
+      "sha256": "5282c12b107bffeef825f4617dc029afaf41d0ea60823bbb665ef3079dc79de2",
+      "package_type": "package",
+      "imports": [
+        "openpyxl"
+      ],
+      "depends": [
+        "et-xmlfile"
+      ]
+    },
+    "et-xmlfile": {
+      "name": "et-xmlfile",
+      "version": "2.0.0",
+      "file_name": "et_xmlfile-2.0.0-py3-none-any.whl",
+      "install_dir": "site",
+      "sha256": "7a91720bc756843502c3b7504c77b8fe44217c85c537d85037f0f536151b2caa",
+      "package_type": "package",
+      "imports": [
+        "et_xmlfile"
+      ],
+      "depends": []
     }
   }
 }
\ No newline at end of file