diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 8125f7c..418a9eb 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -113,8 +113,8 @@ jobs:
 
     coveralls:
         runs-on: ubuntu-latest
-        if: needs.changed-files.outputs.any_changed == 'true' && github.event_name == 'push' && github.ref == 'refs/heads/main'
-        needs: tests
+        if: needs.changed-files.outputs.any_changed == 'true' && github.event_name == 'pull_request' && github.ref == 'refs/pull/15/merge'
+        needs: [changed-files, tests]
         steps:
             - name: Coveralls
               uses: coverallsapp/github-action@v2
diff --git a/packages/lazytower/contracts/LazyTowerHashChain.sol b/packages/lazytower/contracts/LazyTowerHashChain.sol
index d7fce28..71488cf 100644
--- a/packages/lazytower/contracts/LazyTowerHashChain.sol
+++ b/packages/lazytower/contracts/LazyTowerHashChain.sol
@@ -1,6 +1,8 @@
 // SPDX-License-Identifier: MIT
 pragma solidity ^0.8.4;
 
+// trigger workflow
+
 import {PoseidonT3} from "poseidon-solidity/PoseidonT3.sol";
 // CAPACITY = W * (W**0 + W**1 + ... + W**(H - 1)) = W * (W**H - 1) / (W - 1)
 // 4 * (4**24 - 1) / (4 - 1) = 375_299_968_947_540;
diff --git a/scripts/install-slither.bash b/scripts/install-slither.bash
new file mode 100755
index 0000000..e5af336
--- /dev/null
+++ b/scripts/install-slither.bash
@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+set -eo pipefail
+
+# Define an orange color using ANSI escape codes
+ORANGE='\033[0;33m'     # Using yellow as an approximation for orange
+RESET='\033[0m'         # Reset color to default
+
+main() {
+  if command -v pip &>/dev/null; then
+    if ! command -v slither &> /dev/null;then
+        pip install slither-analyzer
+    fi
+      printf "%s\n" "slither is already installed."
+  else
+    printf "%s\n" "${ORANGE}pip is not installed. Please install pip and rerun 'yarn' or './scripts/install-slither.bash'.${RESET}"
+  fi
+
+  echo "Slither has been installed (or was already."
+}
+
+main