diff --git a/.github/workflows/build-admb-and-ss3-from-source.yml b/.github/workflows/build-admb-and-ss3-from-source.yml
index be4a6a8c..44ad9ce6 100644
--- a/.github/workflows/build-admb-and-ss3-from-source.yml
+++ b/.github/workflows/build-admb-and-ss3-from-source.yml
@@ -26,7 +26,7 @@ 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@v4
+      - uses: actions/checkout@v5
     
     # Set up R
       - name: Set up R, specify rtools version and path for Windows
@@ -39,7 +39,7 @@ jobs:
 
     # Checkout ADMB repository
       - name: Checkout admb
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: admb-project/admb
           path: admb
diff --git a/.github/workflows/build-ss3-warnings.yml b/.github/workflows/build-ss3-warnings.yml
index c80de06d..463f66a1 100644
--- a/.github/workflows/build-ss3-warnings.yml
+++ b/.github/workflows/build-ss3-warnings.yml
@@ -33,7 +33,7 @@ jobs:
 
     steps:
       - name: Checkout ss3 repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Update Ubuntu packages
         run: sudo apt-get update
diff --git a/.github/workflows/build-ss3.yml b/.github/workflows/build-ss3.yml
index 655a9a46..b1f94fa9 100644
--- a/.github/workflows/build-ss3.yml
+++ b/.github/workflows/build-ss3.yml
@@ -34,13 +34,13 @@ jobs:
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - name: checkout ss3 repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: 'nmfs-ost/ss3-source-code'
           
       # Checkout ADMB repository
       - name: Checkout admb for macos-13 build
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: admb-project/admb
           path: admb
diff --git a/.github/workflows/run-ss3-bootstrap.yml b/.github/workflows/run-ss3-bootstrap.yml
index aa1e8910..66348f89 100644
--- a/.github/workflows/run-ss3-bootstrap.yml
+++ b/.github/workflows/run-ss3-bootstrap.yml
@@ -32,10 +32,10 @@ jobs:
 
     steps:
       - name: Checkout ss3 repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Checkout test models repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: 'nmfs-ost/ss3-test-models'
           path: test-models-repo
diff --git a/.github/workflows/run-ss3-mcmc.yml b/.github/workflows/run-ss3-mcmc.yml
index 8ec627bf..a95fc7d3 100644
--- a/.github/workflows/run-ss3-mcmc.yml
+++ b/.github/workflows/run-ss3-mcmc.yml
@@ -31,10 +31,10 @@ jobs:
 
     steps:
       - name: Checkout ss3 repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Checkout models repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: 'nmfs-ost/ss3-test-models'
           path: test-models-repo
diff --git a/.github/workflows/run-ss3-no-est.yml b/.github/workflows/run-ss3-no-est.yml
index b8d18e54..1e66ea6b 100644
--- a/.github/workflows/run-ss3-no-est.yml
+++ b/.github/workflows/run-ss3-no-est.yml
@@ -28,7 +28,7 @@ jobs:
 
     steps:
       - name: Checkout ss3 repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
  #     - name: Get last compiled version of SS; alternative to compiling in same wkflow
  #       uses: dawidd6/action-download-artifact@v2
@@ -39,7 +39,7 @@ jobs:
  #         path: ss_linux
 
       - name: Checkout models repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: 'nmfs-ost/ss3-test-models'
           path: test-models-repo
diff --git a/.github/workflows/run-ss3-with-est.yml b/.github/workflows/run-ss3-with-est.yml
index f3611431..aeae3567 100644
--- a/.github/workflows/run-ss3-with-est.yml
+++ b/.github/workflows/run-ss3-with-est.yml
@@ -32,10 +32,10 @@ jobs:
 
     steps:
       - name: Checkout ss3 repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Checkout models repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: 'nmfs-ost/ss3-test-models'
           path: test-models-repo
diff --git a/.github/workflows/test-r4ss-with-ss3.yml b/.github/workflows/test-r4ss-with-ss3.yml
index e24f4475..00a7d505 100644
--- a/.github/workflows/test-r4ss-with-ss3.yml
+++ b/.github/workflows/test-r4ss-with-ss3.yml
@@ -32,10 +32,10 @@ jobs:
 
     steps:
       - name: Checkout ss3 repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Checkout models repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: 'nmfs-ost/ss3-test-models'
           path: test-models-repo
diff --git a/.github/workflows/test-simple-with-ss3-artifacts.yml b/.github/workflows/test-simple-with-ss3-artifacts.yml
index 4399d23f..ef6b05f9 100644
--- a/.github/workflows/test-simple-with-ss3-artifacts.yml
+++ b/.github/workflows/test-simple-with-ss3-artifacts.yml
@@ -36,7 +36,7 @@ jobs:
 
     steps:
       - name: Checkout test repo (this repo)
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up jq and unzip (Linux/macOS)
         if: runner.os != 'Windows'
@@ -146,7 +146,7 @@ jobs:
           fi
 
       - name: Checkout test models repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: nmfs-ost/ss3-test-models
           path: ss3-test-models