diff --git a/pyproject.toml b/pyproject.toml
index e70c3ddf..07689982 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,7 +9,7 @@ homepage = "https://github.com/cast-genomics/haptools"
 documentation = "https://haptools.readthedocs.io"
 
 [tool.poetry.dependencies]
-python = ">=3.7"
+python = ">=3.7,<3.11"
 click = ">=8.0.3"
 pysam = ">=0.19.0"
 cyvcf2 = ">=0.30.14"