diff --git a/.github/workflows/build_doc.yml b/.github/workflows/build_doc.yml
index 93bd11333..3af2d301f 100644
--- a/.github/workflows/build_doc.yml
+++ b/.github/workflows/build_doc.yml
@@ -13,13 +13,13 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
     # Standard drop-in approach that should work for most people.
 
-    - name: Set up Python 3.8
-      uses: actions/setup-python@v1
+    - name: Set up Python 3.10
+      uses: actions/setup-python@v5
       with:
-        python-version: 3.8
+        python-version: "3.10"
 
     - name: Get Python running
       run: |
@@ -41,4 +41,4 @@ jobs:
     - uses: actions/upload-artifact@v1
       with:
         name: Documentation
-        path: docs/build/html/
\ No newline at end of file
+        path: docs/build/html/
diff --git a/.github/workflows/build_tests.yml b/.github/workflows/build_tests.yml
index 392bce4ec..9bdd337c0 100644
--- a/.github/workflows/build_tests.yml
+++ b/.github/workflows/build_tests.yml
@@ -25,9 +25,9 @@ jobs:
         python-version: ["3.8", "3.9", "3.10", "3.11"]
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install POT
@@ -48,9 +48,9 @@ jobs:
     runs-on: ubuntu-latest
     if: "!contains(github.event.head_commit.message, 'no pep8')"
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
     - name: Set up Python 
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v5
       with:
         python-version: "3.10"
     - name: Install dependencies
@@ -69,9 +69,9 @@ jobs:
     runs-on: ubuntu-latest
     if: "!contains(github.event.head_commit.message, 'no ci')"
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
     - name: Set up Python 
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v5
       with:
         python-version: "3.10"
     - name: Install dependencies
@@ -93,12 +93,12 @@ jobs:
      strategy:
        max-parallel: 4
        matrix:
-         python-version: ["3.10"]
+         python-version: ["3.11"]
 
      steps:
-     - uses: actions/checkout@v1
+     - uses: actions/checkout@v4
      - name: Set up Python ${{ matrix.python-version }}
-       uses: actions/setup-python@v1
+       uses: actions/setup-python@v5
        with:
          python-version: ${{ matrix.python-version }}
      - name: Install POT
@@ -120,12 +120,12 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: ["3.10"]
+        python-version: ["3.11"]
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
     - name: RC.exe
diff --git a/.github/workflows/build_tests_cuda.yml b/.github/workflows/build_tests_cuda.yml
index e614aefa8..be8e47c8b 100644
--- a/.github/workflows/build_tests_cuda.yml
+++ b/.github/workflows/build_tests_cuda.yml
@@ -12,7 +12,7 @@ jobs:
     if: github.event.review.state == 'approved' || github.event_name ==     'workflow_dispatch' || (github.event_name == 'push' && github.ref == 'refs/heads/master')
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
     - name: Install POT
       run: |
         python3.10 -m pip install  --ignore-installed -e .
diff --git a/.github/workflows/build_wheels.yml b/.github/workflows/build_wheels.yml
index c6c70251b..c60babff6 100644
--- a/.github/workflows/build_wheels.yml
+++ b/.github/workflows/build_wheels.yml
@@ -18,9 +18,9 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
     - name: Set up Python 3.10
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v5
       with:
         python-version: "3.10"
 
@@ -53,9 +53,9 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:
-    - uses: actions/checkout@v1
-    - name: Set up Python 3.8
-      uses: actions/setup-python@v1
+    - uses: actions/checkout@v4
+    - name: Set up Python 3.10
+      uses: actions/setup-python@v5
       with:
         python-version: "3.10"
 
diff --git a/.github/workflows/build_wheels_weekly.yml b/.github/workflows/build_wheels_weekly.yml
index 5245d41cc..6b2f124fa 100644
--- a/.github/workflows/build_wheels_weekly.yml
+++ b/.github/workflows/build_wheels_weekly.yml
@@ -17,9 +17,9 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
     - name: Set up Python 3.10
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v5
       with:
         python-version: "3.10"
 
diff --git a/examples/barycenters/plot_barycenter_1D.py b/examples/barycenters/plot_barycenter_1D.py
index 40dc44476..7c17c9b22 100644
--- a/examples/barycenters/plot_barycenter_1D.py
+++ b/examples/barycenters/plot_barycenter_1D.py
@@ -100,7 +100,7 @@
 #%% plot interpolation
 plt.figure(2)
 
-cmap = plt.cm.get_cmap('viridis')
+cmap = plt.get_cmap('viridis')
 verts = []
 zs = alpha_list
 for i, z in enumerate(zs):
@@ -122,7 +122,7 @@
 plt.tight_layout()
 
 plt.figure(3)
-cmap = plt.cm.get_cmap('viridis')
+cmap = plt.get_cmap('viridis')
 verts = []
 zs = alpha_list
 for i, z in enumerate(zs):
diff --git a/examples/unbalanced-partial/plot_UOT_barycenter_1D.py b/examples/unbalanced-partial/plot_UOT_barycenter_1D.py
index f747055cb..de1a3b3d5 100644
--- a/examples/unbalanced-partial/plot_UOT_barycenter_1D.py
+++ b/examples/unbalanced-partial/plot_UOT_barycenter_1D.py
@@ -120,7 +120,7 @@
 
 pl.figure(3)
 
-cmap = pl.cm.get_cmap('viridis')
+cmap = pl.get_cmap('viridis')
 verts = []
 zs = weight_list
 for i, z in enumerate(zs):
@@ -142,7 +142,7 @@
 pl.tight_layout()
 
 pl.figure(4)
-cmap = pl.cm.get_cmap('viridis')
+cmap = pl.get_cmap('viridis')
 verts = []
 zs = weight_list
 for i, z in enumerate(zs):