diff --git a/pyproject.toml b/pyproject.toml
index fc159da..359052a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,7 +37,7 @@ dependencies = [
     "scipy>=1.4.0,<2.0.0",
     "h5py>=3.1.0,<4.0.0",
     "opencv-python>=4.5.0,<5.0.0",
-    "pypdfium2>=2.1.0,<3.0.0",  # cf. https://github.com/mindee/doctr/issues/947
+    "pypdfium2>=2.1.0,<5.0.0",  # cf. https://github.com/mindee/doctr/issues/947
     "pyclipper>=1.2.0,<2.0.0",
     "shapely>=1.6.0,<2.0.0",
     "langdetect>=1.0.9,<2.0.0",