diff --git a/pyproject.toml b/pyproject.toml
index 09f4236..6ad9431 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -57,7 +57,7 @@ classifiers = [
 dependencies = [
     "numpy>=1.21,<3",
     "requests>=2.28,<3",
-    "python-frontmatter>=1.0.0,<1.2.0",
+    "python-frontmatter>=1.0.0,<1.4.0",
     "pydantic>=2.0,<3",
 ]