diff --git a/.github/workflows/Buoyant_Plumes.yml b/.github/workflows/Buoyant_Plumes.yml
index 6ec729ff..0fc8c38b 100644
--- a/.github/workflows/Buoyant_Plumes.yml
+++ b/.github/workflows/Buoyant_Plumes.yml
@@ -31,7 +31,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       # Setup python
       - uses: actions/setup-python@v4
diff --git a/.github/workflows/Experimental_Data.yml b/.github/workflows/Experimental_Data.yml
index e5f34df2..c49012f4 100644
--- a/.github/workflows/Experimental_Data.yml
+++ b/.github/workflows/Experimental_Data.yml
@@ -43,7 +43,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       # Setup python
       - uses: actions/setup-python@v4
diff --git a/.github/workflows/Extinction.yml b/.github/workflows/Extinction.yml
index e283d57c..c8d5874c 100644
--- a/.github/workflows/Extinction.yml
+++ b/.github/workflows/Extinction.yml
@@ -31,7 +31,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       # Setup python
       - uses: actions/setup-python@v4
diff --git a/.github/workflows/Fire_Growth.yml b/.github/workflows/Fire_Growth.yml
index a61463b9..949ed1fa 100644
--- a/.github/workflows/Fire_Growth.yml
+++ b/.github/workflows/Fire_Growth.yml
@@ -31,7 +31,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       # Setup python
       - uses: actions/setup-python@v4
diff --git a/.github/workflows/Gaseous_Pool_Fires.yml b/.github/workflows/Gaseous_Pool_Fires.yml
index 90b91fa3..357ab3dd 100644
--- a/.github/workflows/Gaseous_Pool_Fires.yml
+++ b/.github/workflows/Gaseous_Pool_Fires.yml
@@ -31,7 +31,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       # Setup python
       - uses: actions/setup-python@v4
diff --git a/.github/workflows/Line_Endings.yml b/.github/workflows/Line_Endings.yml
index edcc827d..dba4d85b 100644
--- a/.github/workflows/Line_Endings.yml
+++ b/.github/workflows/Line_Endings.yml
@@ -21,7 +21,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Check for CRLF line endings
         run: |
diff --git a/.github/workflows/Liquid_Pool_Fires.yml b/.github/workflows/Liquid_Pool_Fires.yml
index 0e19519d..937bb9c7 100644
--- a/.github/workflows/Liquid_Pool_Fires.yml
+++ b/.github/workflows/Liquid_Pool_Fires.yml
@@ -31,7 +31,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       # Setup python
       - uses: actions/setup-python@v4
diff --git a/.github/workflows/MaCFP-1_Build_LaTeX.yml b/.github/workflows/MaCFP-1_Build_LaTeX.yml
index 654aa1e4..b9ae2153 100644
--- a/.github/workflows/MaCFP-1_Build_LaTeX.yml
+++ b/.github/workflows/MaCFP-1_Build_LaTeX.yml
@@ -29,7 +29,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: pdflatex report
         uses: dante-ev/latex-action@latest
diff --git a/.github/workflows/Wall_Fires.yml b/.github/workflows/Wall_Fires.yml
index 32d09212..87329131 100644
--- a/.github/workflows/Wall_Fires.yml
+++ b/.github/workflows/Wall_Fires.yml
@@ -31,7 +31,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       # Setup python
       - uses: actions/setup-python@v4