diff --git a/.github/workflows/update_api.yml b/.github/workflows/update_api.yml
index 3eeefc0a..8a77ecca 100644
--- a/.github/workflows/update_api.yml
+++ b/.github/workflows/update_api.yml
@@ -44,8 +44,8 @@ jobs:
       - name: Prepare diff for AI summary
         if: steps.changes.outputs.changed == 'true'
         run: |
-          git diff --stat > /tmp/diff_stat.txt
-          git diff | head -c 20000 > /tmp/diff.txt
+          git diff --stat | sed 's/^/      /' > /tmp/diff_stat.txt
+          git diff | head -c 20000 | sed 's/^/      /' > /tmp/diff.txt
       - name: Generate changelog entries with AI
         if: steps.changes.outputs.changed == 'true'
         id: ai
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 83b7f8f3..8a2bb780 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 ### 3.2.1 (Next)
 
 * [#591](https://github.com/slack-ruby/slack-ruby-client/pull/591): Generate AI CHANGELOG entries and PR summaries for automated API update PRs, lock simplecov below 1.1.0 to avoid breaking Coveralls - [@dblock](https://github.com/dblock).
+* [#592](https://github.com/slack-ruby/slack-ruby-client/pull/592): Fix a YAML indentation bug in AI CHANGELOG entry generation that broke the automated API update workflow - [@dblock](https://github.com/dblock).
 * Your contribution here.
 
 ### 3.2.0 (2026/07/05)