diff --git a/pyproject.toml b/pyproject.toml
index 8dc1b11..cc05485 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,12 +17,12 @@ kewords = [
     "grogu",
     "magnetic interactions",
 ]
-requires-python = ">=3.9"
+requires-python = "==3.9"
 dependencies = [
-  "numpy==1.24.4",
-  "scipy==1.10.1",
-  "sisl==0.13",
-  "netcdf4==1.6.2",
+  "numpy",
+  "scipy",
+  "sisl",
+  "netcdf4",
   "openmpi",
   "mpi4py",
 ]