diff --git a/pyproject.toml b/pyproject.toml
index fbb877e9..27d11454 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,7 +3,7 @@ requires = [
     "cmake<3.27",
     "deprecated",  # Because used in csp.impl.struct, which is used in autogen
     "oldest-supported-numpy",
-    "pyarrow>=15,<20",
+    "pyarrow>=15,<21",
     "ruamel.yaml",
     "scikit-build",
     "setuptools>=69,<74",
@@ -25,7 +25,7 @@ dependencies = [
     "packaging",
     "pandas",
     "psutil",
-    "pyarrow>=15,<20",
+    "pyarrow>=15,<21",
     "pydantic>=2",
     "pytz",
     "ruamel.yaml",