diff --git a/.github/workflows/ci_task_1.yml b/.github/workflows/ci_task_1.yml
index c1df10f9..8d88718c 100644
--- a/.github/workflows/ci_task_1.yml
+++ b/.github/workflows/ci_task_1.yml
@@ -18,7 +18,7 @@ jobs:
       image: ghcr.io/fusion-energy/neutronics-workshop:base
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: test task 1
         run: |
diff --git a/.github/workflows/ci_task_10.yml b/.github/workflows/ci_task_10.yml
index 4e5619f0..f80cdf21 100644
--- a/.github/workflows/ci_task_10.yml
+++ b/.github/workflows/ci_task_10.yml
@@ -18,7 +18,7 @@ jobs:
       image: ghcr.io/fusion-energy/neutronics-workshop:base
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: test task 10
         run: |
diff --git a/.github/workflows/ci_task_11.yml b/.github/workflows/ci_task_11.yml
index 7e83b583..a2031f34 100644
--- a/.github/workflows/ci_task_11.yml
+++ b/.github/workflows/ci_task_11.yml
@@ -18,7 +18,7 @@ jobs:
       image: ghcr.io/fusion-energy/neutronics-workshop:base
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: test task 11
         run: |
diff --git a/.github/workflows/ci_task_12.yml b/.github/workflows/ci_task_12.yml
index 55abbbd9..d44e8e32 100644
--- a/.github/workflows/ci_task_12.yml
+++ b/.github/workflows/ci_task_12.yml
@@ -18,7 +18,7 @@ jobs:
       image: ghcr.io/fusion-energy/neutronics-workshop:base
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: test task 12
         run: |
diff --git a/.github/workflows/ci_task_13.yml b/.github/workflows/ci_task_13.yml
index 31c3a1d2..0b748348 100644
--- a/.github/workflows/ci_task_13.yml
+++ b/.github/workflows/ci_task_13.yml
@@ -18,7 +18,7 @@ jobs:
       image: ghcr.io/fusion-energy/neutronics-workshop:base
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: test task 13
         run: |
diff --git a/.github/workflows/ci_task_14.yml b/.github/workflows/ci_task_14.yml
index ba48713c..9ea72dd6 100644
--- a/.github/workflows/ci_task_14.yml
+++ b/.github/workflows/ci_task_14.yml
@@ -18,7 +18,7 @@ jobs:
       image: ghcr.io/fusion-energy/neutronics-workshop:base
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: test task 14
         run: |
diff --git a/.github/workflows/ci_task_15.yml b/.github/workflows/ci_task_15.yml
index d12ced64..7a3cb4d0 100644
--- a/.github/workflows/ci_task_15.yml
+++ b/.github/workflows/ci_task_15.yml
@@ -18,7 +18,7 @@ jobs:
       image: ghcr.io/fusion-energy/neutronics-workshop:base
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: test task 15
         run: |
diff --git a/.github/workflows/ci_task_16.yml b/.github/workflows/ci_task_16.yml
index c983a1b1..1f88fa97 100644
--- a/.github/workflows/ci_task_16.yml
+++ b/.github/workflows/ci_task_16.yml
@@ -18,7 +18,7 @@ jobs:
       image: ghcr.io/fusion-energy/neutronics-workshop:base
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: test task 16
         run: |
diff --git a/.github/workflows/ci_task_2.yml b/.github/workflows/ci_task_2.yml
index cbe387b8..f2bf8ab0 100644
--- a/.github/workflows/ci_task_2.yml
+++ b/.github/workflows/ci_task_2.yml
@@ -18,7 +18,7 @@ jobs:
       image: ghcr.io/fusion-energy/neutronics-workshop:base
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: test task 2
         run: |
diff --git a/.github/workflows/ci_task_3.yml b/.github/workflows/ci_task_3.yml
index c9b1b737..915b5024 100644
--- a/.github/workflows/ci_task_3.yml
+++ b/.github/workflows/ci_task_3.yml
@@ -18,7 +18,7 @@ jobs:
       image: ghcr.io/fusion-energy/neutronics-workshop:base
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: test task 3
         run: |
diff --git a/.github/workflows/ci_task_4.yml b/.github/workflows/ci_task_4.yml
index b626bfc8..d6fe3cca 100644
--- a/.github/workflows/ci_task_4.yml
+++ b/.github/workflows/ci_task_4.yml
@@ -18,7 +18,7 @@ jobs:
       image: ghcr.io/fusion-energy/neutronics-workshop:base
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: test task 4
         run: |
diff --git a/.github/workflows/ci_task_5.yml b/.github/workflows/ci_task_5.yml
index aaf0eafc..c91e69dd 100644
--- a/.github/workflows/ci_task_5.yml
+++ b/.github/workflows/ci_task_5.yml
@@ -18,7 +18,7 @@ jobs:
       image: ghcr.io/fusion-energy/neutronics-workshop:base
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: test task 5
         run: |
diff --git a/.github/workflows/ci_task_6.yml b/.github/workflows/ci_task_6.yml
index eb136784..62bb9383 100644
--- a/.github/workflows/ci_task_6.yml
+++ b/.github/workflows/ci_task_6.yml
@@ -18,7 +18,7 @@ jobs:
       image: ghcr.io/fusion-energy/neutronics-workshop:base
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: test task 6
         run: |
diff --git a/.github/workflows/ci_task_7.yml b/.github/workflows/ci_task_7.yml
index cbf0149a..4b6c50a3 100644
--- a/.github/workflows/ci_task_7.yml
+++ b/.github/workflows/ci_task_7.yml
@@ -18,7 +18,7 @@ jobs:
       image: ghcr.io/fusion-energy/neutronics-workshop:base
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: test task 7
         run: |
diff --git a/.github/workflows/ci_task_8.yml b/.github/workflows/ci_task_8.yml
index 816cdc2e..22cdd117 100644
--- a/.github/workflows/ci_task_8.yml
+++ b/.github/workflows/ci_task_8.yml
@@ -18,7 +18,7 @@ jobs:
       image: ghcr.io/fusion-energy/neutronics-workshop:base
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: test task 8
         run: |
diff --git a/.github/workflows/ci_task_9.yml b/.github/workflows/ci_task_9.yml
index b1a27cc6..0b274fa6 100644
--- a/.github/workflows/ci_task_9.yml
+++ b/.github/workflows/ci_task_9.yml
@@ -18,7 +18,7 @@ jobs:
       image: ghcr.io/fusion-energy/neutronics-workshop:base
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: test task 9
         run: |