diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3200bf791..6018f4c78 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -42,7 +42,7 @@ jobs:
     steps:
     - uses: actions/checkout@v7
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@v7
       with:
         python-version: ${{ matrix.python-version }}
     - run: pip install uv
@@ -70,8 +70,8 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v7
-    - uses: actions/setup-python@v6
+    - uses: actions/checkout@v6
+    - uses: actions/setup-python@v7
       with:
         python-version: "3.12"
     - uses: astral-sh/ruff-action@v3
\ No newline at end of file
diff --git a/.github/workflows/examples.yml b/.github/workflows/examples.yml
index 6f1d8a18f..b7d3cdffb 100644
--- a/.github/workflows/examples.yml
+++ b/.github/workflows/examples.yml
@@ -15,7 +15,7 @@ jobs:
     steps:
     - uses: actions/checkout@v7
     - name: Set up Python 3.12
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@v7
       with:
         python-version: "3.12"
     - run: pip install uv
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 5d0103308..7813cba14 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -21,7 +21,7 @@ jobs:
         uses: actions/checkout@v7
 
       - name: Set up Python 3.12
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7
         with:
           python-version: "3.12"
 
diff --git a/ema_workbench/em_framework/__init__.py b/ema_workbench/em_framework/__init__.py
index 1bdc71d88..2783dfa0c 100644
--- a/ema_workbench/em_framework/__init__.py
+++ b/ema_workbench/em_framework/__init__.py
@@ -30,7 +30,6 @@
     "Problem",
     "RealParameter",
     "ReplicatorModel",
-    "ReplicatorModel",
     "Sample",
     "Samplers",
     "ScalarOutcome",
diff --git a/ema_workbench/em_framework/optimization.py b/ema_workbench/em_framework/optimization.py
index f14b24bf3..bb11e22e6 100644
--- a/ema_workbench/em_framework/optimization.py
+++ b/ema_workbench/em_framework/optimization.py
@@ -686,7 +686,7 @@ def _optimize(
     initial_population: Iterable[Sample] | None = None,
     filename: str | None = None,
     directory: str | None = None,
-    rng: None | StdlibSeedLike = None,
+    rng: StdlibSeedLike | None = None,
     **kwargs,
 ) -> tuple[pd.DataFrame, pd.DataFrame]:
     """Helper function for optimization."""