diff --git a/pyproject.toml b/pyproject.toml
index a1ba97b..1f154b7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -45,6 +45,10 @@ dev = [
     "flake8>=6.0.0",
     "isort>=5.12.0",
 ]
+docs = [
+    "sphinx>=7.0.0",
+    "sphinx-rtd-theme>=1.3.0",
+]
 
 [project.urls]
 Homepage = "https://refactron.us.kg"
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 03552f6..e90040b 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,16 +1,5 @@
 # Development dependencies
+# This file is maintained for backwards compatibility
+# All dependencies are now defined in pyproject.toml under [project.optional-dependencies]
 -r requirements.txt
-
-# Testing
-pytest>=7.0.0
-pytest-cov>=4.0.0
-
-# Code quality
-black>=23.0.0
-mypy>=1.0.0
-flake8>=6.0.0
-isort>=5.12.0
-
-# Documentation
-sphinx>=7.0.0
-sphinx-rtd-theme>=1.3.0
+-e .[dev,docs]
diff --git a/setup_dev.bat b/setup_dev.bat
index 71d0f0c..56a31a0 100644
--- a/setup_dev.bat
+++ b/setup_dev.bat
@@ -45,25 +45,15 @@ if errorlevel 1 (
     exit /b 1
 )
 
-REM Install the package in editable mode with dev dependencies
+REM Install the package in editable mode with dev and docs dependencies
 echo.
 echo 📥 Installing Refactron in development mode...
-python -m pip install -e ".[dev]" --quiet
+python -m pip install -e ".[dev,docs]" --quiet
 if errorlevel 1 (
     echo ❌ Error: Failed to install Refactron in development mode
     exit /b 1
 )
 
-REM Install additional dev dependencies if requirements-dev.txt exists
-if exist "requirements-dev.txt" (
-    echo 📥 Installing additional development dependencies...
-    python -m pip install -r requirements-dev.txt --quiet
-    if errorlevel 1 (
-        echo ❌ Error: Failed to install development dependencies
-        exit /b 1
-    )
-)
-
 REM Install pre-commit hooks
 echo.
 echo 🔧 Setting up pre-commit hooks...
diff --git a/setup_dev.sh b/setup_dev.sh
index 71f2bde..3ab9036 100755
--- a/setup_dev.sh
+++ b/setup_dev.sh
@@ -44,16 +44,10 @@ echo ""
 echo "⬆️  Upgrading pip..."
 pip install --upgrade pip --quiet
 
-# Install the package in editable mode with dev dependencies
+# Install the package in editable mode with dev and docs dependencies
 echo ""
 echo "📥 Installing Refactron in development mode..."
-pip install -e ".[dev]" --quiet
-
-# Install additional dev dependencies if requirements-dev.txt exists
-if [ -f "requirements-dev.txt" ]; then
-    echo "📥 Installing additional development dependencies..."
-    pip install -r requirements-dev.txt --quiet
-fi
+pip install -e ".[dev,docs]" --quiet
 
 # Install pre-commit hooks
 echo ""