dependabot has changed my .gitignore file automatically in main branch

[nikhil20sharma]

Select Topic Area

Question

Body

dependabot has changed my .gitignore file automatically in main branch of my project automatically without my consent

please share your feedback why this happened as this could lead to conflicts with my code
I had checked my user setting as well as each repo settings, the bot was disabled in each of them

but still on Sunday dependabot has raised a PR and merged the code in "main" branch
I wanted to know the reason why this get triggered without my consent

what steps should I have to take so that this issue doesn't rise again in the future

[Dev-axay18]

✅ How to Stop Dependabot from Auto-Merging

Follow these steps to prevent Dependabot or any bot from merging code automatically:

---

2. ⚙️ Turn Off GitHub Auto-Merge

Go to your repo settings:

Settings → General → Pull Requests

• Disable "Allow auto-merge"

---

3. 🛡️ Set Branch Protection

Enable branch protection for main:

Settings → Branches → Add Rule

• ✅ Require pull request reviews
• ✅ Require status checks
• ❌ Disable auto-merge

---

4. 🔍 Check GitHub Actions & Bots

• Look for any workflows in .github/workflows/ that include automerge
• Disable or delete those workflows
• Audit installed GitHub Apps or bots with write/merge access under:

Settings → Integrations → GitHub Apps

---

By applying these changes, you’ll fully prevent automatic merges from Dependabot or other bots.

[nikhil20sharma]

Dear [Dev-axay18]

Thank you so much for your replies but as I had checked
neither my Allow-auto-merge was checked [is disabled]
nor my I am able to find the workflow file

Could be you please what could be possible reason in that scenario

[Dev-axay18]

Hi @nikhil20sharma
Thanks for checking those settings! Since auto-merge is disabled and there's no workflow file — yet you're still seeing merges happen — here are some possible causes and steps to investigate:

---

🛠️ 1. Check Installed GitHub Apps or Bots

Some apps (like Dependabot, Mergify, or Renovate) may auto-merge if they have write/merge access.

• Go to:
  Settings → Integrations → GitHub Apps
• Look for bots/apps with write access to your repo.
• Revoke or restrict permissions if needed.

---

2. Review GitHub Actions History

You can trace who or what merged the PR via the Actions tab.

• Go to the Actions tab in your repo.
• Locate the merged commit.
• Check the actor (e.g., dependabot[bot], renovate[bot], or even a user).

This often reveals which bot or script triggered the action.

---

3. Verify Branch Protection Rules

Sometimes rules may not be applied to the intended branch.

• Go to:
  Settings → Branches → Branch Protection Rules
• Ensure rules are applied to the exact branch name (e.g., main, master, dev)
• Double-check that:
  • ✅ "Require PR reviews" is enabled
  • ✅ "Require status checks" is enabled
  • ❌ "Allow auto-merge" is disabled

---

4. Check Collaborators or Teams

A user with write/admin access might have merged it manually.

• Go to:
  Settings → Collaborators & Teams
• Review who has write or admin access.
• Check their recent activity if needed.

---

Let’s Recap

Possible Cause	What to Do
GitHub App or Bot	Check Integrations → GitHub Apps
Workflow/CI Auto-Merge	Review Actions tab & commits
Incorrect Branch Rule Target	Ensure correct branch in Branch Protection Rules
Manual Merge by Collaborator	Review collaborator access under repo settings

---

[nikhil20sharma]

@Dev-axay18

Thank you for your support

I had check each and every option and the dependabot is diabled whether its repo base settings or user settings

Moreover upon checking the Actions tab it was completely empty as there was no .github/workflow file present in the main branch

and there are only 3 collaborators in my project

am attaching the screenshot of the commit that might help

Moreover for branch restriction I have to go for team or enterprise plan

[Harrysharmax]

To resolve this, you need to find which automation made the change and disable its ability to merge pull requests automatically.

Here are the steps to fix it:

1. Find the Source

Go to your main branch's commit history and find the commit that changed .gitignore. The author's name will tell you what made the change:

• dependabot[bot]: It was Dependabot.
• github-actions[bot]: It was a GitHub Actions workflow.

---

2. Disable the Automation

• If it was Dependabot: The surest way to stop it is to delete the .github/dependabot.yml file from your repository. To disable only security updates, go to Settings > Code security and analysis.
• If it was GitHub Actions: Find the responsible workflow file in your .github/workflows directory and either delete it or remove the part of the script that makes changes.

---

3. Turn Off Auto-Merge

Check your repository settings under Settings > Branches. Edit the branch protection rule for main and uncheck any "Allow auto-merge" options. Also, check your dependabot.yml or workflow files for any auto-merge commands and remove them.

[nikhil20sharma]

Dear [Harrysharmax]

Thank you so much for your replies but as I had checked
neither my Allow-auto-merge was checked [is disabled]
nor my I am able to find the workflow file
also as per branches the auto merge was turned off already

Could be you please what could be possible reason in that scenario how dependabot is able to change my files without my consent

[Harrysharmax]

Dependabot doesn't usually change .gitignore files, so the alteration was probably due to another automation or was an ancillary effect of a dependency update. The merge occurred automatically because an auto-merge option was enabled in your repository's configurations or a config file.

---

## Why This Occurred

There are a couple of probable explanations for this unintended behavior:

• Misidentification: Some other tool, such as a GitHub Actions workflow or third-party app, likely caused the change. The commit message will reveal the actual author (i.e., github-actions[bot] rather than dependabot[bot]).
• Indirect Change: An authentic Dependabot update to a framework or build tool may have necessitated new files to be ignored, which could have caused a change in the .gitignore as an indirect effect.
• Auto-Merge Was Enabled: Either Dependabot or GitHub Actions could be set to auto-merge the pull request when all checks were successful. The agreement for this was received when the auto-merge option was turned on.

---

## How to Prevent This in the Future

To troubleshoot the issue and regain control, do the following.

1. Investigate the Commit ????️‍♀️

This is the most important step. Navigate to your main branch history and identify the commit that modified .gitignore. Look at the author of the commit. This will indicate exactly who made the modification with the bot or service.

2. Manage Dependabot Updates

You said to disable the bot, but there are several configurations to review.

• dependabot.yml File: Having a .github/dependabot.yml file in your repository turns version updates on, overruling any UI setting. To disable version updates entirely, you need to delete this file.
• Security Updates: These are independent. Turn them off by visiting your repository's Settings > Code security and analysis > Dependabot security updates and clicking Disable.

3. Turn Off Auto-Merge

To avoid PRs from getting merged without your approval, you need to locate and turn off the auto-merge feature.

• Branch Protection Rules: Navigate to Settings > Branches. Review rules for your main branch and toggle off any "Allow auto-merge" settings.
• In Configuration Files: Search for auto-merge: true in your .github/dependabot.yml or look for auto-merge commands in your .github/workflows files.

[nikhil20sharma]

Hello @Harrysharmax

Thank you for your support

I had check each and every option and the dependabot is diabled whether its repo base settings or user settings

Moreover upon checking the Actions tab it was completely empty as there was no .github/workflow file present in the main branch

am attaching the screenshot of the commit that might help

Moreover for branch restriction I have to go for team or enterprise plan

[Harrysharmax]

@nikhil20sharma
this can be your solution
How to Put a Stop to It
You must turn off the auto-merge feature for security updates.

Navigate to your repository in GitHub.

Select the Settings tab.

In the left-hand sidebar, select Code security and analysis.

Locate the Dependabot security updates row and click the Enable/Disable or Configure button adjacent to it.

In the configuration panel that appears, you will find a box for Auto-merge. Unselect this check box.

This will prevent Dependabot from merging security patches without your approval. It will continue to make pull requests available for you to review, but you'll need to merge them yourself.

[github-actions[bot]]

🕒 Discussion Activity Reminder 🕒

This Discussion has been labeled as dormant by an automated system for having no activity in the last 60 days. Please consider one the following actions:

1️⃣ Close as Out of Date: If the topic is no longer relevant, close the Discussion as out of date at the bottom of the page.

2️⃣ Provide More Information: Share additional details or context — or let the community know if you've found a solution on your own.

3️⃣ Mark a Reply as Answer: If your question has been answered by a reply, mark the most helpful reply as the solution.

Note: This dormant notification will only apply to Discussions with the Question label. To learn more, see our recent announcement.

Thank you for helping bring this Discussion to a resolution! 💬