diff --git a/.github/workflows/forest.yml b/.github/workflows/forest.yml
index ff6f19a92035..5cf25dd9289b 100644
--- a/.github/workflows/forest.yml
+++ b/.github/workflows/forest.yml
@@ -572,7 +572,6 @@ jobs:
         if: always()
         uses: jwalton/gh-docker-logs@v2
   bootstrap-checks-lotus:
-    if: false
     needs:
       - build-ubuntu
     name: Bootstrap checks - Lotus
@@ -585,6 +584,7 @@ jobs:
       - uses: actions/download-artifact@v5
         with:
           name: "forest-${{ runner.os }}"
+      - run: ./scripts/optimize_disk_space_gh_worker.sh
       - name: Run bootstrap tests
         run: ./scripts/tests/bootstrapper/test_bootstrapper.sh lotus
         timeout-minutes: ${{ fromJSON(env.SCRIPT_TIMEOUT_MINUTES) }}
@@ -646,7 +646,7 @@ jobs:
       - local-devnet-check
       # - local-devnet-curio-check
       - bootstrap-checks-forest
-      # - bootstrap-checks-lotus
+      - bootstrap-checks-lotus
     name: Integration tests status
     runs-on: ubuntu-24.04
     steps:
diff --git a/scripts/optimize_disk_space_gh_worker.sh b/scripts/optimize_disk_space_gh_worker.sh
new file mode 100755
index 000000000000..c82f1336bf54
--- /dev/null
+++ b/scripts/optimize_disk_space_gh_worker.sh
@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# This script checks the free disk space on a GitHub Actions runner
+# and cleans up unnecessary files. To be used as a GitHub Actions workflow step
+# when hitting disk space limits.
+#
+# DO NOT RUN IT LOCALLY as it may mess up your system.
+
+if [[ -z "${GITHUB_ACTIONS}" ]]; then
+  echo "This script is intended to be run only in GitHub Actions runners."
+  exit 1
+fi
+
+echo "Disk space before cleanup $(df -h)"
+
+sudo rm -rf /usr/share/dotnet
+sudo rm -rf /usr/local/lib/android
+sudo rm -rf /opt/ghc
+sudo rm -rf /opt/hostedtoolcache/CodeQL
+sudo docker image prune --all --force
+sudo docker builder prune -a
+
+echo "Disk space after cleanup $(df -h)"