diff --git a/Dockerfile b/Dockerfile
index f1419c0..37b6199 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,7 +14,7 @@ RUN apt-get update && \
     python3-pip \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/* \
-    && python3 -m pip install --no-cache-dir --upgrade pip setuptools wheel
+    && python3 -m pip install --no-cache-dir --upgrade "pip>=21.3" setuptools wheel
 
 # Add architecture-specific compiler flags if needed
 ENV ARCHFLAGS=""
@@ -24,7 +24,7 @@ RUN mkdir -p /app/src/simpleguardhome && \
     chmod -R 755 /app
 
 # Copy source code, maintaining directory structure
-COPY setup.py requirements.txt /app/
+COPY setup.py requirements.txt pyproject.toml /app/
 COPY src /app/src/
 
 # Set PYTHONPATH
@@ -37,10 +37,8 @@ RUN pip install --no-cache-dir -r requirements.txt
 RUN set -e && \
     echo "Installing package..." && \
     pip uninstall -y simpleguardhome || true && \
-    # First install dependencies only
-    pip install --no-deps -v -e . && \
-    # Then install package with dependencies
-    pip install -e . && \
+    # Install package in editable mode with compatibility mode enabled
+    pip install --use-pep517 -e . --config-settings editable_mode=compat && \
     echo "Verifying installation..." && \
     pip show simpleguardhome && \
     # List all package files
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..b264e78
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,29 @@
+[build-system]
+requires = ["setuptools>=64.0.0", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "simpleguardhome"
+version = "0.1.0"
+description = "SimpleGuardHome - A lightweight AdGuardHome UI"
+authors = [
+    {name = "SimpleGuardHome Team"}
+]
+readme = "README.md"
+license = {file = "LICENSE"}
+requires-python = ">=3.7"
+dependencies = [
+    "fastapi",
+    "uvicorn",
+    "python-dotenv",
+    "httpx",
+    "pydantic",
+    "jinja2",
+]
+
+[tool.setuptools]
+package-dir = {"" = "src"}
+packages = {find = {where = ["src"]}}
+
+[tool.setuptools.package-data]
+simpleguardhome = ["templates/*", "favicon.ico"]
\ No newline at end of file
diff --git a/setup.py b/setup.py
index d0f350a..fc1f76c 100644
--- a/setup.py
+++ b/setup.py
@@ -1,22 +1,3 @@
-from setuptools import setup, find_packages
-from pathlib import Path
+from setuptools import setup
 
-setup(
-    name="simpleguardhome",
-    version="0.1.0",
-    packages=find_packages(where="src"),
-    package_dir={"": "src"},
-    include_package_data=True,
-    package_data={
-        "simpleguardhome": ["templates/*", "favicon.ico"]
-    },
-    python_requires=">=3.7",
-    install_requires=[
-        "fastapi",
-        "uvicorn",
-        "python-dotenv",
-        "httpx",
-        "pydantic",
-        "jinja2",
-    ],
-)
\ No newline at end of file
+setup()
\ No newline at end of file
diff --git a/src/simpleguardhome/templates/index.html b/src/simpleguardhome/templates/index.html
index ef5fa32..0d1c463 100644
--- a/src/simpleguardhome/templates/index.html
+++ b/src/simpleguardhome/templates/index.html
@@ -4,7 +4,8 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>SimpleGuardHome</title>
-    <script src="https://cdn.tailwindcss.com"></script>
+    <script src="https://unpkg.com/@tailwindcss/browser@4" integrity="sha384-fsXZ0Oru5QjGkveFx8DdmBAyKdwnJ7TnbRzDN5LROCKt8PAN8h7y7oqCwtk9cN68" crossorigin="anonymous"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/dompurify/2.3.4/purify.min.js" integrity="sha384-KGmzmwrs7oAU2sG5qfETslFsscVcCaxQrX2d7PW7I9bTrsuTD/eSMFr9jaMS9i+b" crossorigin="anonymous"></script>
     <script>
         function escapeHtml(unsafe) {
             return unsafe
@@ -14,10 +15,20 @@
                 .replace(/"/g, "&quot;")
                 .replace(/'/g, "&#039;");
         }
-
+            return unsafe.replace(/[&<"']/g, function (m) {
+                switch (m) {
+                    case '&': return '&amp;';
+                    case '<': return '&lt;';
+                    case '>': return '&gt;';
+                    case '"': return '&quot;';
+                    case "'": return '&#039;';
+                    default: return m;
+                }
+            });
+        }
         async function checkDomain(event) {
             event.preventDefault();
-            const domain = document.getElementById('domain').value;
+            const domain = DOMPurify.sanitize(document.getElementById('domain').value);
             const resultDiv = document.getElementById('result');
             const unblockDiv = document.getElementById('unblock-action');
             const submitBtn = document.getElementById('submit-btn');
@@ -69,7 +80,7 @@
                     resultDiv.innerHTML = `
                         <div class="bg-${bgColor}-100 border-l-4 border-${bgColor}-500 text-${bgColor}-700 p-4">
                             <p class="font-bold">Error checking domain</p>
-                            <p class="text-sm">${errorMsg}</p>
+                            <p class="text-sm">${escapeHtml(errorMsg)}</p>
                         </div>`;
                     unblockDiv.innerHTML = '';
                 }
@@ -171,4 +182,4 @@
         </div>
     </div>
 </body>
-</html>
\ No newline at end of file
+</html>