diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1e467cd3..d9262dbe 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,14 +14,14 @@ permissions:
 
 jobs:
   shellcheck:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Run shellcheck
         run: find . -type f \( -name "*.sh" -o -path "*/bin/*" \) ! -name '*.jq' | xargs -t shellcheck
   build-stack:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     needs:
       - shellcheck
     env:
diff --git a/tools/bin/install-heroku-files b/tools/bin/install-heroku-files
index 32b266d2..0c1f120f 100755
--- a/tools/bin/install-heroku-files
+++ b/tools/bin/install-heroku-files
@@ -15,6 +15,7 @@ echo "127.0.0.1 localhost localhost.localdomain" > "$IMG_MNT/etc/hosts"
 echo "heroku-runtime" > "$IMG_MNT/etc/hostname"
 
 for f in etc/profile etc/bash.bashrc; do
+  # shellcheck disable=SC2028 # https://www.shellcheck.net/wiki/SC2028
   echo "export PS1='\\[\\033[01;34m\\]\\w\\[\\033[00m\\] \\[\\033[01;32m\\]$ \\[\\033[00m\\]'" > "$IMG_MNT/$f"
 done