diff --git a/.github/workflows/codespell.yml b/.github/workflows/codespell.yml
index 98f4054..541bd01 100644
--- a/.github/workflows/codespell.yml
+++ b/.github/workflows/codespell.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/create_release.yml b/.github/workflows/create_release.yml
index 2e7d0fb..c91fb80 100644
--- a/.github/workflows/create_release.yml
+++ b/.github/workflows/create_release.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Get the version
         id: get_version
diff --git a/.github/workflows/ecsn.yml b/.github/workflows/ecsn.yml
index e5e34f2..1f6e44f 100644
--- a/.github/workflows/ecsn.yml
+++ b/.github/workflows/ecsn.yml
@@ -5,7 +5,7 @@ jobs:
   ecsn:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index 755393b..2ccc777 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -10,7 +10,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Install pandoc and doxygen
         run: |
diff --git a/.github/workflows/lagrangian_planar.yml b/.github/workflows/lagrangian_planar.yml
index eb1742d..d55e2c1 100644
--- a/.github/workflows/lagrangian_planar.yml
+++ b/.github/workflows/lagrangian_planar.yml
@@ -5,7 +5,7 @@ jobs:
   lagrangian_planar:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/low_mass_convective_star.yml b/.github/workflows/low_mass_convective_star.yml
index accac04..26ee37e 100644
--- a/.github/workflows/low_mass_convective_star.yml
+++ b/.github/workflows/low_mass_convective_star.yml
@@ -5,7 +5,7 @@ jobs:
   low_mass_convective_star:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/massive_star.yml b/.github/workflows/massive_star.yml
index b24c751..bee8f64 100644
--- a/.github/workflows/massive_star.yml
+++ b/.github/workflows/massive_star.yml
@@ -5,7 +5,7 @@ jobs:
   massive_star:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/spherical.yml b/.github/workflows/spherical.yml
index 3d770af..c2e72b8 100644
--- a/.github/workflows/spherical.yml
+++ b/.github/workflows/spherical.yml
@@ -5,7 +5,7 @@ jobs:
   spherical:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/sub_chandra.yml b/.github/workflows/sub_chandra.yml
index 5dfbb44..4f4d3b3 100644
--- a/.github/workflows/sub_chandra.yml
+++ b/.github/workflows/sub_chandra.yml
@@ -5,7 +5,7 @@ jobs:
   sub_chandra:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/test2.yml b/.github/workflows/test2.yml
index db79f7d..3d38bba 100644
--- a/.github/workflows/test2.yml
+++ b/.github/workflows/test2.yml
@@ -5,7 +5,7 @@ jobs:
   test2:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/toy_atm.yml b/.github/workflows/toy_atm.yml
index 403770f..a1233bc 100644
--- a/.github/workflows/toy_atm.yml
+++ b/.github/workflows/toy_atm.yml
@@ -5,7 +5,7 @@ jobs:
   toy_atm:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/urca.yml b/.github/workflows/urca.yml
index 32271b4..cacccad 100644
--- a/.github/workflows/urca.yml
+++ b/.github/workflows/urca.yml
@@ -5,7 +5,7 @@ jobs:
   urca:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0