diff --git a/pyproject.toml b/pyproject.toml
index 7d4a570..79eefa9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ dependencies = [
     "pydantic~=2.10",
     "rich~=13.9",
     "pyyaml~=6.0",
-    "pypdf~=4.0",
+    "pypdf>=4,<7",
     "prompt-toolkit~=3.0",
 ]