diff --git a/.github/INTEGRATION_FAILURE.md b/.github/INTEGRATION_FAILURE.md
new file mode 100644
index 0000000000000..afa055b18364e
--- /dev/null
+++ b/.github/INTEGRATION_FAILURE.md
@@ -0,0 +1,10 @@
+---
+title: "bug: long-running integration tests failed"
+labels: P-high, T-bug
+---
+
+The heavy (long-running) integration tests have failed. This indicates a regression in foundry.
+
+Check the [heavy integration tests workflow page]({{env.WORKFLOW_URL}}) for details.
+
+This issue was raised by the workflow at `.github/workflows/heavy-integration.yml`.
\ No newline at end of file
diff --git a/.github/workflows/heavy-integration.yml b/.github/workflows/heavy-integration.yml
new file mode 100644
index 0000000000000..3a6e8df7873ed
--- /dev/null
+++ b/.github/workflows/heavy-integration.yml
@@ -0,0 +1,103 @@
+name: Heavy (long-running) integration tests
+
+on:
+    schedule:
+        # Runs at 10PM utc
+        - cron: "0 22 * * *"
+    workflow_dispatch:
+
+env:
+    CARGO_TERM_COLOR: always
+
+jobs:
+    build-tests:
+        name: build tests / ${{ matrix.archive.name }}
+        runs-on: ubuntu-latest
+        strategy:
+            matrix:
+                archive:
+                    - name: heavy-integration-tests
+                      file: heavy-integration.tar.zst
+                      flags: -p foundry-cli --features heavy-integration-tests
+        steps:
+            - uses: actions/checkout@v3
+            - uses: dtolnay/rust-toolchain@stable
+            - uses: Swatinem/rust-cache@v2
+            - uses: taiki-e/install-action@nextest
+            - name: Build archive (long-running tests)
+              run: |
+                  cargo nextest archive \
+                  --locked \
+                  --archive-file ${{ matrix.archive.file }} \
+                  ${{ matrix.archive.flags }}
+            - name: Upload archive
+              uses: actions/upload-artifact@v3
+              with:
+                  name: ${{ matrix.archive.name }}
+                  path: ${{ matrix.archive.file }}
+
+    install-svm-solc:
+        name: install svm and solidity / ${{ matrix.job.name }}
+        runs-on: ubuntu-latest
+        timeout-minutes: 30
+        steps:
+            - name: Install svm
+              run: cargo install svm-rs
+            - name: Install Solidity 0.8.19
+              run: svm install 0.8.19
+            - name: Install Solidity 0.8.20
+              run: svm install 0.8.20
+            - name: Use Solidity 0.8.19
+              run: svm use 0.8.19
+
+    heavy-integration:
+        name: heavy (long-running) integration tests / ${{ matrix.job.name }}
+        runs-on: ubuntu-latest
+        needs: build-tests
+        strategy:
+            matrix:
+                job:
+                    - name: Long-running integration tests
+                      filter: "!test(~live)"
+        env:
+            ETH_RPC_URL: https://eth-mainnet.alchemyapi.io/v2/C3JEvfW6VgtqZQa-Qp1E-2srEiIc02sD
+        steps:
+            - uses: actions/checkout@v3
+            - uses: taiki-e/install-action@nextest
+            - uses: dtolnay/rust-toolchain@stable
+            - name: Download archives
+              uses: actions/download-artifact@v3
+              with:
+                  name: heavy-integration-tests
+
+            - name: Forge RPC cache
+              uses: actions/cache@v3
+              if: matrix.job.name != 'non-forking'
+              with:
+                  path: "$HOME/.foundry/cache"
+                  key: rpc-cache-${{ hashFiles('cli/tests/rpc-cache-keyfile') }}
+
+            - name: Setup git config
+              run: |
+                  git config --global user.name "GitHub Actions Bot"
+                  git config --global user.email "<>"
+
+            - name: Force use of HTTPS for submodules
+              run: git config --global url."https://github.com/".insteadOf "git@github.com:"
+
+            - name: cargo nextest
+              run: |
+                  # see https://github.com/foundry-rs/foundry/pull/3959
+                  export LD_LIBRARY_PATH="$(rustc --print sysroot)/lib"
+                  cargo nextest run --retries 3 --archive-file heavy-integration.tar.zst -E '${{ matrix.job.filter }}'
+
+            # If any of the steps fail, this will create a high-priority issue
+            # to signal so.
+            - uses: JasonEtco/create-an-issue@v2
+              if: ${{ failure() }}
+              env:
+                  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+                  WORKFLOW_URL: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}
+              with:
+                  update_existing: true
+                  filename: .github/INTEGRATION_FAILURE.md
\ No newline at end of file
diff --git a/crates/cli/Cargo.toml b/crates/cli/Cargo.toml
index 21a72a38429ab..de75874a6692f 100644
--- a/crates/cli/Cargo.toml
+++ b/crates/cli/Cargo.toml
@@ -96,6 +96,9 @@ openssl = ["ethers/openssl"]
 # feature for integration tests that test external projects
 external-integration-tests = []
 
+# feature for heavy (long-running) integration tests
+heavy-integration-tests = []
+
 [[bin]]
 name = "cast"
 path = "src/cast/main.rs"
diff --git a/crates/cli/tests/it/heavy_integration.rs b/crates/cli/tests/it/heavy_integration.rs
new file mode 100644
index 0000000000000..16db33965c153
--- /dev/null
+++ b/crates/cli/tests/it/heavy_integration.rs
@@ -0,0 +1,4 @@
+// ! Heavy integration tests that can take an hour to run or more.
+use foundry_cli_test_utils::forgetest_external;
+
+forgetest_external!(maple, "maple-labs/maple-core-v2");
diff --git a/crates/cli/tests/it/main.rs b/crates/cli/tests/it/main.rs
index 18e79c26a5713..e031bfb2c9dc5 100644
--- a/crates/cli/tests/it/main.rs
+++ b/crates/cli/tests/it/main.rs
@@ -30,6 +30,9 @@ pub(crate) mod forge_utils;
 #[cfg(feature = "external-integration-tests")]
 mod integration;
 
+#[cfg(feature = "heavy-integration-tests")]
+mod heavy_integration;
+
 pub mod constants;
 
 fn main() {}