diff --git a/.github/workflows/test-per-system.yml b/.github/workflows/test-per-system.yml
index c0686cd..f3550f9 100644
--- a/.github/workflows/test-per-system.yml
+++ b/.github/workflows/test-per-system.yml
@@ -4,7 +4,7 @@ on:
   workflow_call:
     inputs:
       runs-on:
-        description: 'GitHub Actions runner to use (e.g., ubuntu-latest, macos-13)'
+        description: 'GitHub Actions runner to use (e.g., ubuntu-latest, macos-latest)'
         required: true
         type: string
       system:
@@ -24,7 +24,7 @@ jobs:
   simple-build:
     runs-on: ${{ inputs.runs-on }}
     steps:
-    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+    - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
     - name: Install Nix
       uses: ./
       with:
@@ -40,7 +40,7 @@ jobs:
   custom-nix-path:
     runs-on: ${{ inputs.runs-on }}
     steps:
-    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+    - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
     - name: Install Nix
       uses: ./
       with:
@@ -51,7 +51,7 @@ jobs:
   extra-nix-config:
     runs-on: ${{ inputs.runs-on }}
     steps:
-    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+    - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
     - name: Install Nix
       uses: ./
       with:
@@ -64,7 +64,7 @@ jobs:
   flakes:
     runs-on: ${{ inputs.runs-on }}
     steps:
-    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+    - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
     - name: Install Nix
       uses: ./
     - run: nix flake show github:NixOS/nixpkgs
@@ -72,7 +72,7 @@ jobs:
   latest-installer:
     runs-on: ${{ inputs.runs-on }}
     steps:
-    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+    - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
     - name: Run NAR server
       run: |
         curl --location https://github.com/cachix/nar-toolbox/releases/download/v0.1.0/nar-toolbox-${{ inputs.system }} -O
@@ -89,7 +89,7 @@ jobs:
   oldest-supported-installer:
     runs-on: ${{ inputs.runs-on }}
     steps:
-    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+    - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
     - name: Install Nix
       uses: ./
       with:
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index fb25d14..e974b11 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -45,10 +45,6 @@ jobs:
           - runs-on: macos-15-intel
             system: x86_64-darwin
             oldest_installer_version: nix-2.18.6
-          # macos13 will be retired on 04/12/2025
-          - runs-on: macos-13
-            system: x86_64-darwin
-            oldest_installer_version: nix-2.8.0
     uses: ./.github/workflows/test-per-system.yml
     with:
       runs-on: ${{ matrix.runs-on }}
@@ -58,7 +54,7 @@ jobs:
   act-support:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+    - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
     - run: curl https://raw.githubusercontent.com/nektos/act/master/install.sh | sudo bash
     - run: docker pull ghcr.io/catthehacker/ubuntu:js-24.04
     - run: |
diff --git a/.github/workflows/update-nix.yml b/.github/workflows/update-nix.yml
index 225a3ac..de5fb8c 100644
--- a/.github/workflows/update-nix.yml
+++ b/.github/workflows/update-nix.yml
@@ -8,7 +8,7 @@ jobs:
   update-nix-releases:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Update nix releases
         env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -30,7 +30,7 @@ jobs:
           echo "LATEST_NIX=${latest_nix}" >> $GITHUB_ENV
           sed -i -E "s/nix_version=[0-9.]+/nix_version=${latest_nix}/" ./install-nix.sh
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@v7
+        uses: peter-evans/create-pull-request@v8
         with:
           title: "nix: ${{ env.CURRENT_NIX }} -> ${{ env.LATEST_NIX }}"
           commit-message: "nix: ${{ env.CURRENT_NIX }} -> ${{ env.LATEST_NIX }}"
diff --git a/install-nix.sh b/install-nix.sh
index 007b399..01bc178 100755
--- a/install-nix.sh
+++ b/install-nix.sh
@@ -102,7 +102,7 @@ echo "installer options: ${installer_options[*]}"
 
 # There is --retry-on-errors, but only newer curl versions support that
 curl_retries=5
-nix_version=2.32.4
+nix_version=2.33.0
 while ! curl -sS -o "$workdir/install" -v --fail -L "${INPUT_INSTALL_URL:-https://releases.nixos.org/nix/nix-${nix_version}/install}"; do
   sleep 1
   ((curl_retries--))