diff --git a/pyproject.toml b/pyproject.toml
index 266c09be1..4da364380 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -126,6 +126,6 @@ ignored-classes = [
 ]
 
 [tool.mypy]
-python_version = 3.9
+python_version = 3.12
 mypy_path = "$MYPY_CONFIG_FILE_DIR/src:$MYPY_CONFIG_FILE_DIR/tests"
 ignore_missing_imports = true
diff --git a/tox.ini b/tox.ini
index dbf3b9236..208f46946 100644
--- a/tox.ini
+++ b/tox.ini
@@ -41,7 +41,7 @@ commands =
 [testenv:test-minimal]
 description = Checks for project unit tests with minimal package versions
 basepython =
-   python3.12
+   python3.9
 skip_install = true
 allowlist_externals  =
     poetry