diff --git a/.github/workflows/shipjs-manual-prepare.yml b/.github/workflows/shipjs-manual-prepare.yml
index a709676..8caa9f7 100644
--- a/.github/workflows/shipjs-manual-prepare.yml
+++ b/.github/workflows/shipjs-manual-prepare.yml
@@ -18,4 +18,3 @@ jobs:
       - run: npm run release:prepare -- --yes --no-browse
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          SLACK_INCOMING_HOOK: ${{ secrets.SLACK_INCOMING_HOOK }}
diff --git a/.github/workflows/shipjs-trigger.yml b/.github/workflows/shipjs-trigger.yml
index 24dac86..73c960c 100644
--- a/.github/workflows/shipjs-trigger.yml
+++ b/.github/workflows/shipjs-trigger.yml
@@ -26,4 +26,3 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           NPM_AUTH_TOKEN: ${{ secrets.NPM_AUTH_TOKEN }}
-          SLACK_INCOMING_HOOK: ${{ secrets.SLACK_INCOMING_HOOK }}
diff --git a/ship.config.mjs b/ship.config.mjs
index 2b11de7..96ea6e6 100644
--- a/ship.config.mjs
+++ b/ship.config.mjs
@@ -1,10 +1,5 @@
 export default {
   publishCommand: ({ defaultCommand }) => `${defaultCommand} --access public`,
   mergeStrategy: { toSameBranch: ['master'] },
-  pullRequestReviewers: ['nd0ut'],
-  slack: {
-    // disable slack notification for `prepared` lifecycle.
-    // Ship.js will send slack message only for `releaseSuccess`.
-    prepared: null
-  }
+  pullRequestReviewers: ['nd0ut']
 }