diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index 233ade2..dec2dcb 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -15,11 +15,11 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        py: ['3.8', '3.9']
+        py: ['3.9', '3.10', '3.11']
         weldx_version: ['weldx']
         include:
           - os: ubuntu-latest
-            py: 3.8
+            py: '3.10'
             weldx_version: 'git+https://github.com/BAMWelDX/weldx.git'
     env:
       WELDX_VERSION: ${{ matrix.weldx_version }}
diff --git a/setup.cfg b/setup.cfg
index a6376e2..4a4ac63 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -21,8 +21,9 @@ classifiers =
     Natural Language :: English
     Programming Language :: Python
     Programming Language :: Python :: 3 :: Only
-    Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
+    Programming Language :: Python :: 3.11
     Topic :: Scientific/Engineering :: Physics
 project_urls =
     Documentation = https://weldx.readthedocs.io
@@ -32,7 +33,7 @@ project_urls =
 
 [options]
 packages = find:
-python_requires = >=3.8
+python_requires = >=3.9
 setup_requires =
     setuptools >=38.3.0
     setuptools_scm
diff --git a/weldx_widgets/widget_groove_sel.py b/weldx_widgets/widget_groove_sel.py
index f8474e1..ccb37eb 100644
--- a/weldx_widgets/widget_groove_sel.py
+++ b/weldx_widgets/widget_groove_sel.py
@@ -385,7 +385,8 @@ def _update_plot(self, *args):
             self.groove_obj = groove_obj
 
         # TODO: re-plot can be avoided (e.g. set_xydata?)
-        self.ax.lines.clear()
+        if self.ax.lines:
+            self.ax.lines.clear()
         # self.ax.texts = []
 
         self.groove_obj.plot(line_style="-", ax=self.ax)