diff --git a/pyproject.toml b/pyproject.toml
index 003831a..4f15d2d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ keywords = [
 license = { file = "LICENSE" }
 name = "brickmos"
 readme = "README.md"
-requires-python = ">=3.10"
+requires-python = ">=3.9"
 
 [project.urls]
 Homepage = "https://github.com/merschformann/brickmos"