diff --git a/pvgridder/__about__.py b/pvgridder/__about__.py
index 01b3a8b..c858c59 100644
--- a/pvgridder/__about__.py
+++ b/pvgridder/__about__.py
@@ -1 +1 @@
-__version__ = "0.4.1"
\ No newline at end of file
+__version__ = "0.4.2"
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index 68e8c82..bc9aa4d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -57,7 +57,7 @@ version = {attr = "pvgridder.__about__.__version__"}
 
 [tool.ruff]
 line-length = 88
-target-version = "py38"
+target-version = "py39"
 
 exclude = [
     "pvgridder/__about__.py"