diff --git a/.github/workflows/repro.yml b/.github/workflows/repro.yml
new file mode 100644
index 000000000000..f21dbcb6cf20
--- /dev/null
+++ b/.github/workflows/repro.yml
@@ -0,0 +1,78 @@
+---
+# https://docs.corelightning.org/docs/repro
+name: Repro Build Nightly
+on:
+  # 05:00 Berlin, 03:00 UTC, 23:00 New York, 20:00 Los Angeles
+  schedule:
+    - cron: "0 3 * * *"
+  workflow_dispatch:
+
+jobs:
+  ubuntu:
+    name: "Ubuntu repro build: ${{ matrix.version }}"
+    runs-on: ubuntu-22.04
+    strategy:
+      fail-fast: false    # Let each build finish.
+      matrix:
+        version: ['focal', 'jammy', 'noble']
+    steps:
+      - name: Git checkout
+        uses: actions/checkout@v4
+
+      - name: Build environment setup
+        run: |
+          echo "Building base image for ${{ matrix.version }}"
+          sudo docker run --rm -v $(pwd):/build ubuntu:${{ matrix.version }} bash -c "\
+              apt-get update && \
+              apt-get install -y debootstrap && \
+              debootstrap ${{ matrix.version }} /build/${{ matrix.version }}"
+          sudo tar -C ${{ matrix.version }} -c . | docker import - ${{ matrix.version }}
+
+      - name: Builder image setup
+        run: docker build -t cl-repro-${{ matrix.version }} - < contrib/reprobuild/Dockerfile.${{ matrix.version }}
+
+      - name: Build using the builder image and store Git state
+        run: |
+          # Create release directory.
+          mkdir $GITHUB_WORKSPACE/release
+
+          # Perform the repro build.
+          docker run --name cl-build -v $GITHUB_WORKSPACE:/repo -e FORCE_MTIME=$(date +%F) -t cl-repro-${{ matrix.version }}
+
+          # Commit the image in order to inspect the build later.
+          docker commit cl-build cl-release
+
+          # Inspect the version.
+          docker run --rm -v $GITHUB_WORKSPACE:/repo -t cl-release bash -c "make version > /repo/release/version.txt"
+
+          # Inspect the Git tree state.
+          docker run --rm -v $GITHUB_WORKSPACE:/repo -t cl-release bash -c "\
+              git --no-pager status > /repo/release/git.log && \
+              git --no-pager diff >> /repo/release/git.log"
+
+          # Change permissions on the release files for access by the runner environment.
+          sudo chown -R runner $GITHUB_WORKSPACE/release
+
+      - name: Assert clean version and release
+        run: |
+          echo 'Version:'
+          cat release/version.txt
+          echo -e
+
+          releasefile=$(ls release/clightning-*)
+          echo 'Release file:'
+          ls -al release/clightning-*
+          echo -e
+
+          if [ -n "$(cat release/version.txt | sed -n '/-modded/p')" ] || \
+             [ -n "$(echo $releasefile | sed -n '/-modded/p')" ]
+          then
+            echo "Git Status and Diff:"
+            cat release/git.log
+            echo -e
+
+            echo 'Error: release modded / dirty tree.'
+            exit 1
+          else
+            echo 'Success! Clean release.'
+          fi
diff --git a/Makefile b/Makefile
index f835842c99ee..80b61324dc24 100644
--- a/Makefile
+++ b/Makefile
@@ -899,8 +899,11 @@ installcheck: all-programs
 	fi
 	@rm -rf testinstall || true
 
+version:
+	@echo ${VERSION}
+
 .PHONY: installdirs install-program install-data install uninstall \
-	installcheck ncc bin-tarball show-flags
+	installcheck ncc bin-tarball show-flags version
 
 # Make a tarball of opt/clightning/, optionally with label for distribution.
 ifneq ($(VERSION),)
diff --git a/contrib/reprobuild/Dockerfile.focal b/contrib/reprobuild/Dockerfile.focal
index ea0d85516a90..5e951a88a726 100644
--- a/contrib/reprobuild/Dockerfile.focal
+++ b/contrib/reprobuild/Dockerfile.focal
@@ -44,12 +44,12 @@ RUN git clone https://github.com/pyenv/pyenv.git /root/.pyenv && \
     libsqlite3-dev \
     libssl-dev \
     zlib1g-dev && \
-    pyenv install 3.8.0 && \
-    pyenv global 3.8.0
+    pyenv install 3.10.0 && \
+    pyenv global 3.10.0
 
 RUN wget https://bootstrap.pypa.io/get-pip.py -O /tmp/get-pip.py && python3 /tmp/get-pip.py \
     && rm /tmp/get-pip.py \
-    && pip install poetry mako grpcio-tools
+    && pip install poetry mako grpcio-tools==1.62.2
 
 RUN wget https://sh.rustup.rs -O rustup-install.sh && \
     bash rustup-install.sh --default-toolchain none --quiet -y && \