diff --git a/.github/workflows/check-for-updates.yml b/.github/workflows/check-for-updates.yml
new file mode 100644
index 0000000..e784b0e
--- /dev/null
+++ b/.github/workflows/check-for-updates.yml
@@ -0,0 +1,33 @@
+
+on:
+  schedule:
+    - cron: '30 12 * * 3'   # every Wednesday at 12:30
+  workflow_dispatch: {}     # when manually started via "Actions" tab.
+
+jobs:
+  check_code_versions:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        tool: [4c, fleur, heat, nest, pffrg]
+    steps:
+
+      - name: "Checkout repository content"
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+        with:
+          fetch-depth: 0
+
+      - name: "Fetch latest repository versions"
+        run: |
+          DESCRIPTION="_codes/${{ matrix.tool }}.md"
+          echo "Scanning $DESCRIPTION..."
+          grep 'Repository: .*github.com/' $DESCRIPTION   # check if repository is on github (required for API calls)
+          REPO="$(grep 'Repository:' $DESCRIPTION | sed -e 's%Repository.*https://github.com/%%')"
+          echo "Checking repository $REPO on GitHub..."
+          RELEASE="$(curl -sL https://api.github.com/repos/$REPO/releases/latest | jq ".tag_name")"
+          echo "Found latest release: $RELEASE"
+          DOI="https://$(curl -sL https://api.github.com/repos/$REPO/releases/latest | jq ".body" | grep -o 'doi.org/[^)]*zenodo[^)]\+' | head -n1)"
+          echo "Found latest DOI: $DOI"
+          grep $RELEASE $DESCRIPTION    # check latest release is mentioned
+          grep $DOI $DESCRIPTION        # check latest DOI is mentioned
diff --git a/_codes/nest.md b/_codes/nest.md
index e293eff..7c37b60 100644
--- a/_codes/nest.md
+++ b/_codes/nest.md
@@ -9,6 +9,7 @@ Members: https://github.com/orgs/nest/people and https://nest-initiative.org
 Research Field: Helmholtz Information
 Scientific Community: Biology, Medicine, AI
 Funding: See https://github.com/nest/nest-simulator/blob/master/ACKNOWLEDGMENTS.md
+Repository: https://github.com/nest/nest-simulator
 Programming Languages: C++, Python
 License: GPL-2.0-or-later
 Cite:  <a href="https://doi.org/10.5281/zenodo.5886894" alt="NEST 3.2"><img src="https://zenodo.org/badge/DOI/10.5281/zenodo.5886894.svg" alt="DOI"></a>