diff --git a/pyproject.toml b/pyproject.toml
index 42c1adab..c3fce716 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,7 +18,7 @@ dependencies = [
     "sqlalchemy>=2.0.54",
     "alembic>=1.20.1",
     "python-slugify>=9.1.3",
-    "python-dateutil>=2.9.0.post0",  # Required for partition management
+    "python-dateutil>=4.0.0",  # Required for partition management
     "aiofiles>=25.1.0",
     "httpx>=0.28.1",
     "faster-whisper>=1.2.1",
diff --git a/requirements.txt b/requirements.txt
index aed5938e..faa5f197 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ psycopg2-binary>=2.9.13
 sqlalchemy>=2.0.54
 alembic>=1.20.1
 python-slugify>=9.1.3
-python-dateutil>=2.9.0.post0
+python-dateutil>=4.0.0
 aiofiles>=25.1.0
 httpx>=0.28.1
 faster-whisper>=1.2.1