diff --git a/pyproject.toml b/pyproject.toml
index ee0120e..4a5040c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -86,7 +86,7 @@ vid2llm = "vid2llm.cli:app"
 # OpenCV backend. Wraps the cv2 Python bindings for fast in-process decoding.
 cv = ["opencv-python>=4.9.0,<5.0"]
 # PyAV backend. Provides Pythonic access to FFmpeg libraries with precise timestamps.
-pyav = ["av>=12.0.0,<14.0"]
+pyav = ["av>=12.0.0,<19.0"]
 # FFmpeg backend. Driven entirely by the ffmpeg binary, no Python dependency required.
 ffmpeg = []
 ocr = []