diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..fb1e341
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,2 @@
+# Use the testnet in development
+# ALEPH_API_URL=https://api.twentysix.testnet.network
diff --git a/README.md b/README.md
index 0b634a2..046a40c 100644
--- a/README.md
+++ b/README.md
@@ -4,31 +4,29 @@ A UI for decentralized AI
 
 ## Install the dependencies
 
-```bash
-npm i
+```sh
+npm install
 ```
 
-### Start the app in development mode (hot-code reloading, error reporting, etc.)
-
-```bash
-quasar dev
-```
+> Don't forget to also fill environment variables in a `.env` file. You can use [`.env.example`](.env.example) as an
+> inspiration.
 
-### Lint the files
+### Start the app in development mode (hot-code reloading, error reporting, etc.)
 
-```bash
-npm run lint
+```sh
+npm run dev
 ```
 
-### Format the files
+### Format and lint the files
 
-```bash
+```sh
 npm run format
+npm run lint
 ```
 
 ### Build the app for production
 
-```bash
+```sh
 npm run build
 ```
 
diff --git a/package-lock.json b/package-lock.json
index 17c9ae2..2143cea 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -19,6 +19,7 @@
         "axios": "^1.7.3",
         "dayjs": "^1.11.12",
         "dompurify": "^3.1.6",
+        "dotenv": "^16.4.5",
         "eciesjs": "^0.4.7",
         "filesize": "^10.1.4",
         "highlight.js": "^11.10.0",
@@ -9549,6 +9550,18 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/dotenv": {
+      "version": "16.4.5",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-16.4.5.tgz",
+      "integrity": "sha512-ZmdL2rui+eB2YwhsWzjInR8LldtZHGDoQ1ugH85ppHKwpUHL7j7rN0Ti9NCnGiQbhaZ11FpR+7ao1dNsmduNUg==",
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://dotenvx.com"
+      }
+    },
     "node_modules/duplexify": {
       "version": "4.1.3",
       "resolved": "https://registry.npmjs.org/duplexify/-/duplexify-4.1.3.tgz",
diff --git a/package.json b/package.json
index 72c75eb..08aa043 100644
--- a/package.json
+++ b/package.json
@@ -34,6 +34,7 @@
     "axios": "^1.7.3",
     "dayjs": "^1.11.12",
     "dompurify": "^3.1.6",
+    "dotenv": "^16.4.5",
     "eciesjs": "^0.4.7",
     "filesize": "^10.1.4",
     "highlight.js": "^11.10.0",
diff --git a/quasar.config.js b/quasar.config.js
index 1434af3..6a3709b 100644
--- a/quasar.config.js
+++ b/quasar.config.js
@@ -85,7 +85,7 @@ module.exports = configure(function (/* ctx */) {
 
       // publicPath: '/',
       // analyze: true,
-      // env: {},
+      env: require('dotenv').config().parsed,
       // rawDefine: {}
       // ignorePublicFolder: true,
       // minify: false,
diff --git a/src/utils/aleph-persistent-storage.ts b/src/utils/aleph-persistent-storage.ts
index c4a86c9..dfd8a54 100644
--- a/src/utils/aleph-persistent-storage.ts
+++ b/src/utils/aleph-persistent-storage.ts
@@ -48,8 +48,8 @@ export class AlephPersistentStorage {
 
     const subAccount = importAccountFromPrivateKey(privateKey);
     const account = await getAccountFromProvider(window.ethereum);
-    const accountClient = new AuthenticatedAlephHttpClient(account);
-    const subAccountClient = new AuthenticatedAlephHttpClient(subAccount);
+    const accountClient = new AuthenticatedAlephHttpClient(account, process.env.ALEPH_API_URL);
+    const subAccountClient = new AuthenticatedAlephHttpClient(subAccount, process.env.ALEPH_API_URL);
 
     await AlephPersistentStorage.getSecurityPermission(account, subAccount, accountClient);
 
diff --git a/src/utils/knowledge/parsing.ts b/src/utils/knowledge/parsing.ts
index 12008fa..fc7279e 100644
--- a/src/utils/knowledge/parsing.ts
+++ b/src/utils/knowledge/parsing.ts
@@ -2,7 +2,7 @@ import mime from 'mime';
 import * as pdfjs from 'pdfjs-dist';
 import { TextItem } from 'pdfjs-dist/types/src/display/api';
 
-export const supportedInputFiles = ['.txt', '.md', '.pdf', '.py'].join(',');
+export const supportedInputFiles = ['.txt', '.md', '.pdf'].join(',');
 
 const extractTextFromPdfFile = async (file: File): Promise<string> => {
   const pdfUrl = URL.createObjectURL(file);