diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b7a182423..a0fbc4a63 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,5 +1,5 @@
 # Nimbus
-# Copyright (c) 2020-2023 Status Research & Development GmbH
+# Copyright (c) 2020-2024 Status Research & Development GmbH
 # Licensed under either of
 #  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
 #    http://www.apache.org/licenses/LICENSE-2.0)
@@ -76,7 +76,7 @@ jobs:
     runs-on: ${{ matrix.builder }}
     steps:
       - name: Checkout nimbus-eth1
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Derive environment variables
         run: |
@@ -150,7 +150,7 @@ jobs:
       - name: Restore rocksdb from cache (Macos/Linux)
         if: runner.os != 'Windows'
         id: rocksdb-cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: rocks-db-cache-${{ matrix.target.cpu }}
           key: 'rocksdb-v2-${{ matrix.target.os }}-${{ matrix.target.cpu }}'
@@ -180,7 +180,7 @@ jobs:
       - name: Restore llvm-mingw (Windows) from cache
         if: runner.os == 'Windows'
         id: windows-mingw-cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: external/mingw-${{ matrix.target.cpu }}
           key: 'mingw-llvm-17-${{ matrix.target.cpu }}'
@@ -188,7 +188,7 @@ jobs:
       - name: Restore Nim DLLs dependencies (Windows) from cache
         if: runner.os == 'Windows'
         id: windows-dlls-cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: external/dlls-${{ matrix.target.cpu }}
           # according to docu, idle caches are kept for up to 7 days
@@ -250,7 +250,7 @@ jobs:
 
       - name: Restore prebuilt Nim from cache
         id: nim-cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: NimBinCache
           key: 'nim-${{ matrix.target.os }}-${{ matrix.target.cpu }}-${{ steps.versions.outputs.nimbus_build_system }}-${{ matrix.target.evmc }}'
@@ -314,7 +314,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 2  # In PR, has extra merge commit: ^1 = PR, ^2 = base
 
diff --git a/.github/workflows/fluffy.yml b/.github/workflows/fluffy.yml
index dae46822d..375bdb93a 100644
--- a/.github/workflows/fluffy.yml
+++ b/.github/workflows/fluffy.yml
@@ -1,5 +1,5 @@
 # Fluffy
-# Copyright (c) 2021-2023 Status Research & Development GmbH
+# Copyright (c) 2021-2024 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
@@ -43,7 +43,7 @@ jobs:
     if: github.event_name == 'push'
     steps:
       - name: Checkout nimbus-eth1
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install modprobe
         run: |
@@ -65,7 +65,7 @@ jobs:
 
       - name: Restore prebuilt Nim binaries from cache
         id: nim-cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: NimBinaries
           key: 'nim-linux-amd64-${{ steps.versions.outputs.nimbus_build_system }}-fluffy'
@@ -133,7 +133,7 @@ jobs:
     runs-on: ${{ matrix.builder }}
     steps:
       - name: Checkout nimbus-eth1
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Derive environment variables
         run: |
@@ -194,7 +194,7 @@ jobs:
       - name: Restore llvm-mingw (Windows) from cache
         if: runner.os == 'Windows'
         id: windows-mingw-cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: external/mingw-${{ matrix.target.cpu }}
           key: 'mingw-llvm-17-${{ matrix.target.cpu }}'
@@ -202,7 +202,7 @@ jobs:
       - name: Restore Nim DLLs dependencies (Windows) from cache
         if: runner.os == 'Windows'
         id: windows-dlls-cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: external/dlls-${{ matrix.target.cpu }}
           key: 'dlls-${{ matrix.target.cpu }}-fluffy'
@@ -253,7 +253,7 @@ jobs:
 
       - name: Restore prebuilt Nim binaries from cache
         id: nim-cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: NimBinaries
           key: 'nim-${{ matrix.target.os }}-${{ matrix.target.cpu }}-${{ steps.versions.outputs.nimbus_build_system }}-fluffy'
diff --git a/.github/workflows/fluffy_docs.yml b/.github/workflows/fluffy_docs.yml
index 0f81adaa8..3944a606f 100644
--- a/.github/workflows/fluffy_docs.yml
+++ b/.github/workflows/fluffy_docs.yml
@@ -1,5 +1,5 @@
 # Fluffy
-# Copyright (c) 2023 Status Research & Development GmbH
+# Copyright (c) 2023-2024 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
@@ -26,7 +26,7 @@ jobs:
         with:
           python-version: 3.x
       - run: echo "cache_id=$(date --utc '+%V')" >> $GITHUB_ENV
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           key: mkdocs-material-${{ env.cache_id }}
           path: .cache
diff --git a/.github/workflows/fluffy_nightly_docker.yml b/.github/workflows/fluffy_nightly_docker.yml
index 799f805da..1ecde2d85 100644
--- a/.github/workflows/fluffy_nightly_docker.yml
+++ b/.github/workflows/fluffy_nightly_docker.yml
@@ -1,5 +1,5 @@
 # Fluffy
-# Copyright (c) 2023 Status Research & Development GmbH
+# Copyright (c) 2023-2024 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Login to Docker Hub
         uses: docker/login-action@v1
         with:
diff --git a/.github/workflows/nightly_build.yml b/.github/workflows/nightly_build.yml
index d04bd2f22..b96d27b76 100644
--- a/.github/workflows/nightly_build.yml
+++ b/.github/workflows/nightly_build.yml
@@ -1,3 +1,13 @@
+# Nimbus
+# Copyright (c) 2020-2024 Status Research & Development GmbH
+# Licensed under either of
+#  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+#    http://www.apache.org/licenses/LICENSE-2.0)
+#  * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+#    http://opensource.org/licenses/MIT)
+# at your option. This file may not be copied, modified, or distributed except
+# according to those terms.
+
 name: Nightly build
 on:
   schedule:
@@ -10,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: ${{ github.ref }}
 
@@ -29,7 +39,7 @@ jobs:
           echo "archive_dir=${NEW_ARCHIVE_DIR}" >> $GITHUB_OUTPUT
 
       - name: Upload archive artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Linux_amd64_archive
           path: |
@@ -38,7 +48,7 @@ jobs:
           retention-days: 2
 
       - name: Upload checksum artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Linux_amd64_checksum
           path: ./dist/${{ steps.make_dist.outputs.archive_dir }}/build/nimbus.sha512sum
@@ -57,7 +67,7 @@ jobs:
           sudo apt-get -qq -y install binfmt-support qemu-user-static
 
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: ${{ github.ref }}
 
@@ -76,7 +86,7 @@ jobs:
           echo "archive_dir=${NEW_ARCHIVE_DIR}" >> $GITHUB_OUTPUT
 
       - name: Upload archive artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Linux_arm64_archive
           path: |
@@ -85,7 +95,7 @@ jobs:
           retention-days: 2
 
       - name: Upload checksum artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Linux_arm64_checksum
           path: ./dist/${{ steps.make_dist.outputs.archive_dir }}/build/nimbus.sha512sum
@@ -96,7 +106,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: ${{ github.ref }}
 
@@ -115,7 +125,7 @@ jobs:
           echo "archive_dir=${NEW_ARCHIVE_DIR}" >> $GITHUB_OUTPUT
 
       - name: Upload archive artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Windows_amd64_archive
           path: |
@@ -124,7 +134,7 @@ jobs:
           retention-days: 2
 
       - name: Upload checksum artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Windows_amd64_checksum
           path: ./dist/${{ steps.make_dist.outputs.archive_dir }}/build/nimbus.sha512sum
@@ -135,7 +145,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: ${{ github.ref }}
 
@@ -154,7 +164,7 @@ jobs:
           echo "archive_dir=${NEW_ARCHIVE_DIR}" >> $GITHUB_OUTPUT
 
       - name: Upload archive artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: macOS_amd64_archive
           path: |
@@ -163,7 +173,7 @@ jobs:
           retention-days: 2
 
       - name: Upload checksum artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: macOS_amd64_checksum
           path: ./dist/${{ steps.make_dist.outputs.archive_dir }}/build/nimbus.sha512sum
@@ -174,7 +184,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: ${{ github.ref }}
 
@@ -193,7 +203,7 @@ jobs:
           echo "archive_dir=${NEW_ARCHIVE_DIR}" >> $GITHUB_OUTPUT
 
       - name: Upload archive artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: macOS_arm64_archive
           path: |
@@ -202,7 +212,7 @@ jobs:
           retention-days: 2
 
       - name: Upload checksum artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: macOS_arm64_checksum
           path: ./dist/${{ steps.make_dist.outputs.archive_dir }}/build/nimbus.sha512sum
@@ -214,12 +224,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: ${{ github.ref }}
 
       - name: Download artefacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
 
       - name: Create release notes
         run: |
diff --git a/.github/workflows/nimbus_verified_proxy.yml b/.github/workflows/nimbus_verified_proxy.yml
index 4d32a22b7..5b516ab19 100644
--- a/.github/workflows/nimbus_verified_proxy.yml
+++ b/.github/workflows/nimbus_verified_proxy.yml
@@ -1,3 +1,13 @@
+# Nimbus
+# Copyright (c) 2021-2024 Status Research & Development GmbH
+# Licensed under either of
+#  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+#    http://www.apache.org/licenses/LICENSE-2.0)
+#  * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+#    http://opensource.org/licenses/MIT)
+# at your option. This file may not be copied, modified, or distributed except
+# according to those terms.
+
 name: Nimbus verified proxy CI
 on:
   push:
@@ -56,7 +66,7 @@ jobs:
     runs-on: ${{ matrix.builder }}
     steps:
       - name: Checkout nimbus-eth1
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Derive environment variables
         run: |
@@ -118,7 +128,7 @@ jobs:
       - name: Restore llvm-mingw (Windows) from cache
         if: runner.os == 'Windows'
         id: windows-mingw-cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: external/mingw-${{ matrix.target.cpu }}
           key: 'mingw-llvm-17-${{ matrix.target.cpu }}'
@@ -126,7 +136,7 @@ jobs:
       - name: Restore Nim DLLs dependencies (Windows) from cache
         if: runner.os == 'Windows'
         id: windows-dlls-cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: external/dlls-${{ matrix.target.cpu }}
           key: 'dlls-${{ matrix.target.cpu }}-verified-proxy'
@@ -177,7 +187,7 @@ jobs:
 
       - name: Restore prebuilt Nim from cache
         id: nim-cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: NimBinCache
           key: 'nim-${{ matrix.target.os }}-${{ matrix.target.cpu }}-${{ steps.versions.outputs.nimbus_build_system }}-verified-proxy'
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index b2f93a65f..bb2bdc2df 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -1,3 +1,13 @@
+# Nimbus
+# Copyright (c) 2020-2024 Status Research & Development GmbH
+# Licensed under either of
+#  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+#    http://www.apache.org/licenses/LICENSE-2.0)
+#  * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+#    http://opensource.org/licenses/MIT)
+# at your option. This file may not be copied, modified, or distributed except
+# according to those terms.
+
 on:
   push:
     tags:
@@ -11,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Build project
         id: make_dist
         run: |
@@ -22,13 +32,13 @@ jobs:
           echo "archive_dir=${ARCHIVE%.tar.gz}" >> $GITHUB_OUTPUT
           tar -xzf ${ARCHIVE} ${ARCHIVE%.tar.gz}/build/nimbus.sha512sum
       - name: Upload archive artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Linux_amd64_archive
           path: ./dist/${{ steps.make_dist.outputs.archive }}
           retention-days: 2
       - name: Upload checksum artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Linux_amd64_checksum
           path: ./dist/${{ steps.make_dist.outputs.archive_dir }}/build/nimbus.sha512sum
@@ -61,7 +71,7 @@ jobs:
           sudo apt-get -qq update
           sudo apt-get -qq -y install binfmt-support qemu-user-static
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Build project
         id: make_dist
         run: |
@@ -72,13 +82,13 @@ jobs:
           echo "archive_dir=${ARCHIVE%.tar.gz}" >> $GITHUB_OUTPUT
           tar -xzf ${ARCHIVE} ${ARCHIVE%.tar.gz}/build/nimbus.sha512sum
       - name: Upload archive artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Linux_arm64_archive
           path: ./dist/${{ steps.make_dist.outputs.archive }}
           retention-days: 2
       - name: Upload checksum artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Linux_arm64_checksum
           path: ./dist/${{ steps.make_dist.outputs.archive_dir }}/build/nimbus.sha512sum
@@ -105,7 +115,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Build project
         id: make_dist
         run: |
@@ -116,13 +126,13 @@ jobs:
           echo "archive_dir=${ARCHIVE%.tar.gz}" >> $GITHUB_OUTPUT
           tar -xzf ${ARCHIVE} ${ARCHIVE%.tar.gz}/build/nimbus.sha512sum
       - name: Upload archive artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Windows_amd64_archive
           path: ./dist/${{ steps.make_dist.outputs.archive }}
           retention-days: 2
       - name: Upload checksum artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Windows_amd64_checksum
           path: ./dist/${{ steps.make_dist.outputs.archive_dir }}/build/nimbus.sha512sum
@@ -132,7 +142,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Build project
         id: make_dist
         run: |
@@ -143,13 +153,13 @@ jobs:
           echo "archive_dir=${ARCHIVE%.tar.gz}" >> $GITHUB_OUTPUT
           tar -xzf ${ARCHIVE} ${ARCHIVE%.tar.gz}/build/nimbus.sha512sum
       - name: Upload archive artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: macOS_amd64_archive
           path: ./dist/${{ steps.make_dist.outputs.archive }}
           retention-days: 2
       - name: Upload checksum artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: macOS_amd64_checksum
           path: ./dist/${{ steps.make_dist.outputs.archive_dir }}/build/nimbus.sha512sum
@@ -159,7 +169,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Build project
         id: make_dist
         run: |
@@ -170,13 +180,13 @@ jobs:
           echo "archive_dir=${ARCHIVE%.tar.gz}" >> $GITHUB_OUTPUT
           tar -xzf ${ARCHIVE} ${ARCHIVE%.tar.gz}/build/nimbus.sha512sum
       - name: Upload archive artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: macOS_arm64_archive
           path: ./dist/${{ steps.make_dist.outputs.archive }}
           retention-days: 2
       - name: Upload checksum artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: macOS_arm64_checksum
           path: ./dist/${{ steps.make_dist.outputs.archive_dir }}/build/nimbus.sha512sum
@@ -187,7 +197,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Download artefacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
       - name: Create release notes
         run: |
           cat > release_notes.md <<EOF
diff --git a/.github/workflows/simulators.yml b/.github/workflows/simulators.yml
index a4800febd..3c40434fc 100644
--- a/.github/workflows/simulators.yml
+++ b/.github/workflows/simulators.yml
@@ -1,3 +1,13 @@
+# Nimbus
+# Copyright (c) 2021-2024 Status Research & Development GmbH
+# Licensed under either of
+#  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+#    http://www.apache.org/licenses/LICENSE-2.0)
+#  * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+#    http://opensource.org/licenses/MIT)
+# at your option. This file may not be copied, modified, or distributed except
+# according to those terms.
+
 name: Simulators
 on:
   schedule:
@@ -11,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Get latest nimbus-build-system commit hash
         id: versions
@@ -25,7 +35,7 @@ jobs:
           echo "nimbus_build_system=$nbsHash" >> $GITHUB_OUTPUT
 
       - name: Restore prebuilt Nim from cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: NimBinaries
           key: 'nim-linux-amd64-${{ steps.versions.outputs.nimbus_build_system }}-sim'
@@ -43,7 +53,7 @@ jobs:
           ${SIM_SCRIPT} "Linux-amd64"
 
       - name: Upload artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: linux_amd64_stat
           path: ./simulators.md
@@ -54,7 +64,7 @@ jobs:
     runs-on: macos-11
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Get latest nimbus-build-system commit hash
         id: versions
@@ -66,7 +76,7 @@ jobs:
           echo "nimbus_build_system=$nbsHash" >> $GITHUB_OUTPUT
 
       - name: Restore prebuilt Nim from cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: NimBinaries
           key: 'nim-macos-amd64-${{ steps.versions.outputs.nimbus_build_system }}-sim'
@@ -84,7 +94,7 @@ jobs:
           ${SIM_SCRIPT} "MacOS-amd64"
 
       - name: Upload artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: macos_amd64_stat
           path: ./simulators.md
@@ -98,12 +108,12 @@ jobs:
         shell: bash
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Restore llvm-mingw (Windows) from cache
         if: runner.os == 'Windows'
         id: windows-mingw-cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: external/mingw-amd64
           key: 'mingw-llvm-17-sim'
@@ -136,7 +146,7 @@ jobs:
           echo "nimbus_build_system=$nbsHash" >> $GITHUB_OUTPUT
 
       - name: Restore prebuilt Nim from cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: NimBinaries
           key: 'nim-windows-amd64-${{ steps.versions.outputs.nimbus_build_system }}-sim'
@@ -153,7 +163,7 @@ jobs:
           ${SIM_SCRIPT} "Windows-amd64"
 
       - name: Upload artefact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: windows_amd64_stat
           path: ./simulators.md
@@ -165,12 +175,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: master
 
       - name: Download artefacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
 
       - name: Create statistics notes
         run: |