diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index c23f23d..7b570e3 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -11,7 +11,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         name: Install Python
         with:
@@ -20,6 +20,6 @@ jobs:
         run: |
           python -m pip install -U build setuptools_scm
           python -m build .
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           path: dist/*
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 980e8db..a9f7c98 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -14,18 +14,18 @@ jobs:
 
     steps:
       - name: Checkout main
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           path: main
 
       - name: Checkout gh-pages
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           path: gh-pages
           ref: gh-pages
 
       - name: Set up Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: 3.11
 
diff --git a/.github/workflows/merge-tests.yml b/.github/workflows/merge-tests.yml
index bf2d564..cee52ff 100644
--- a/.github/workflows/merge-tests.yml
+++ b/.github/workflows/merge-tests.yml
@@ -12,7 +12,7 @@ jobs:
       run_job: ${{ steps.check_files.outputs.run_job }}
     steps:
       - name: Checkout PyBADS
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
           path: pybads
@@ -53,18 +53,18 @@ jobs:
 
     steps:
       - name: Checkout PyBADS
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           path: pybads
 
       - name: Checkout GPyReg
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: acerbilab/gpyreg
           path: gpyreg
 
       - name: Setup Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
 
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 1f8d1b5..19a4c21 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -17,18 +17,18 @@ jobs:
 
     steps:
       - name: Checkout PyBADS
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           path: pybads
 
       - name: Checkout GPyReg
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: acerbilab/gpyreg
           path: gpyreg
 
       - name: Setup Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
 
diff --git a/pybads/testing/bads/test_bads_optimization.py b/pybads/testing/bads/test_bads_optimization.py
index c21218f..edceb36 100644
--- a/pybads/testing/bads/test_bads_optimization.py
+++ b/pybads/testing/bads/test_bads_optimization.py
@@ -156,4 +156,4 @@ def test_he_noisy_sphere_opt():
     fun = he_noisy_sphere
     oracle_fun = lambda x: np.sum(np.atleast_2d(x)**2, axis=1)                          # True objective function
     run_bads(fun, x0, LB, UB, PLB, PUB, tol_errs, f_min=0.0, oracle_fun=oracle_fun, uncertainty_handling=2, assert_flag=True)
-    
\ No newline at end of file
+