diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index d0a04349d..f656e4f0b 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -40,7 +40,7 @@ jobs:
             test-id: include
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: "Set up Julia"
         uses: julia-actions/setup-julia@v1
         with:
@@ -91,7 +91,7 @@ jobs:
   incremental_install:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: "Build incremental install"
         run: docker build -t pysr -f pysr/test/incremental_install_simulator.dockerfile .
       - name: "Test incremental install"
@@ -108,7 +108,7 @@ jobs:
         os: ['ubuntu-latest']
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: "Cache conda"
         uses: actions/cache@v2
         env:
@@ -168,7 +168,7 @@ jobs:
         os: ['ubuntu-latest']
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: "Set up Python"
         uses: actions/setup-python@v5
         with:
diff --git a/.github/workflows/CI_Windows.yml b/.github/workflows/CI_Windows.yml
index ef1a2caae..e6850c775 100644
--- a/.github/workflows/CI_Windows.yml
+++ b/.github/workflows/CI_Windows.yml
@@ -34,7 +34,7 @@ jobs:
         os: [windows-latest]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: "Set up Julia"
         uses: julia-actions/setup-julia@v1
         with:
diff --git a/.github/workflows/CI_docker.yml b/.github/workflows/CI_docker.yml
index 91082e358..2da0dc283 100644
--- a/.github/workflows/CI_docker.yml
+++ b/.github/workflows/CI_docker.yml
@@ -33,7 +33,7 @@ jobs:
         arch: ['linux/amd64']
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Build docker
         run: docker build --platform=${{ matrix.arch }} -t pysr .
       - name: Test docker
diff --git a/.github/workflows/CI_docker_large_nightly.yml b/.github/workflows/CI_docker_large_nightly.yml
index cb307b38b..98644a965 100644
--- a/.github/workflows/CI_docker_large_nightly.yml
+++ b/.github/workflows/CI_docker_large_nightly.yml
@@ -25,7 +25,7 @@ jobs:
 
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2
         with:
diff --git a/.github/workflows/CI_large_nightly.yml b/.github/workflows/CI_large_nightly.yml
index 13619b40b..da314c29b 100644
--- a/.github/workflows/CI_large_nightly.yml
+++ b/.github/workflows/CI_large_nightly.yml
@@ -28,7 +28,7 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: "Set up Julia"
         uses: julia-actions/setup-julia@v1
         with:
diff --git a/.github/workflows/CI_mac.yml b/.github/workflows/CI_mac.yml
index f8d260b6e..cb5be3a46 100644
--- a/.github/workflows/CI_mac.yml
+++ b/.github/workflows/CI_mac.yml
@@ -34,7 +34,7 @@ jobs:
         os: [macos-latest]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: "Set up Julia"
         uses: julia-actions/setup-julia@v1
         with:
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index a1a57b7d4..9b96a00f6 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -27,7 +27,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
diff --git a/.github/workflows/docker_deploy.yml b/.github/workflows/docker_deploy.yml
index d54aec72f..bd6e45c9a 100644
--- a/.github/workflows/docker_deploy.yml
+++ b/.github/workflows/docker_deploy.yml
@@ -22,7 +22,7 @@ jobs:
         julia-version: [1.9.4]
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Login to Docker Hub
         uses: docker/login-action@v2
         if: github.event_name != 'pull_request'
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index ad0bf7e37..534d9df6e 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -20,7 +20,7 @@ jobs:
         shell: bash
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: "Set up Python"
         uses: actions/setup-python@v5
         with:
diff --git a/.github/workflows/pypi_deploy.yml b/.github/workflows/pypi_deploy.yml
index 70f238046..e2cdce6ee 100644
--- a/.github/workflows/pypi_deploy.yml
+++ b/.github/workflows/pypi_deploy.yml
@@ -15,7 +15,7 @@ jobs:
       id-token: write
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: "Set up Python"
         uses: actions/setup-python@v5
         with:
diff --git a/.github/workflows/update_backend.yml b/.github/workflows/update_backend.yml
index f31f29c31..fce95072a 100644
--- a/.github/workflows/update_backend.yml
+++ b/.github/workflows/update_backend.yml
@@ -7,7 +7,7 @@ jobs:
   update_compat:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
           python-version: 3.9