diff --git a/pyproject.toml b/pyproject.toml
index 9cd402c5..da80065c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,7 +21,7 @@ dependencies = [
     "libsonata",
     "psutil"
 ]
-requires-python=">=3.10"
+requires-python=">=3.9"
 
 [project.optional-dependencies]
 plotting=['matplotlib'] # only for Neurodamus HL API