diff --git a/requirements.txt b/requirements.txt
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+# Core bot framework
+aiogram>=3.0.0
+
+# Calendar processing
+icalendar>=5.0.0
+python-dateutil>=2.8.0
+
+# Timezone support
+pytz>=2023.3
+
+# HTTP client for downloading calendar files
+wget>=3.2
+
+# Database (built-in with Python)
+# sqlite3 - included in Python standard library
+
+# Additional dependencies for date/time handling
+typing-extensions>=4.0.0