diff --git a/.github/workflows/check-working-examples.yaml b/.github/workflows/check-working-examples.yaml
index 032f77fc0..7580ae3b5 100644
--- a/.github/workflows/check-working-examples.yaml
+++ b/.github/workflows/check-working-examples.yaml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
         os: [ubuntu-latest] #, macos-latest, windows-latest]
       fail-fast: False
 
diff --git a/.github/workflows/continuous-integration-workflow.yaml b/.github/workflows/continuous-integration-workflow.yaml
index 5e27b3c38..0035cdb0e 100644
--- a/.github/workflows/continuous-integration-workflow.yaml
+++ b/.github/workflows/continuous-integration-workflow.yaml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
         os: [ubuntu-latest] #, macos-latest, windows-latest]
       fail-fast: False
     env:
diff --git a/.github/workflows/deploy-pages.yaml b/.github/workflows/deploy-pages.yaml
index 3da057988..708ba1930 100644
--- a/.github/workflows/deploy-pages.yaml
+++ b/.github/workflows/deploy-pages.yaml
@@ -18,7 +18,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v4
       with:
-        python-version: "3.10"
+        python-version: "3.13"
 
     - name: Install dependencies
       run: |
diff --git a/.github/workflows/quality-metrics-workflow.yaml b/.github/workflows/quality-metrics-workflow.yaml
index 3e8365ff0..f2b9a073f 100644
--- a/.github/workflows/quality-metrics-workflow.yaml
+++ b/.github/workflows/quality-metrics-workflow.yaml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: ["3.10"]
+        python-version: ["3.13"]
         os: [ubuntu-latest]
       fail-fast: False
 
diff --git a/floris/flow_visualization.py b/floris/flow_visualization.py
index b893b172a..8cab7aaa4 100644
--- a/floris/flow_visualization.py
+++ b/floris/flow_visualization.py
@@ -759,8 +759,9 @@ def add_ref_lines(
                 'color': 'k',
                 'linewidth': 1.1
         }
-        kwargs = default_params | kwargs
+        params = copy.deepcopy(default_params)
+        params.update(kwargs)
 
         for ax in self.axs[row]:
             for coordinate in ref_lines_D:
-                ax.plot([0.0, 1.0], [coordinate, coordinate], **kwargs)
+                ax.plot([0.0, 1.0], [coordinate, coordinate], **params)