How to Secure Your .NET Dependencies Using Dependabot (No CI Required)

Most .NET developers already use GitHub for their projects.

What’s less obvious is that GitHub can also help you manage dependency security with almost no effort. If you’re using NuGet packages—and you probably are—this matters more than you think.

A single vulnerable dependency is enough to expose your entire application. And in many cases, you won’t even realize it’s there.

The good news is that GitHub provides a built-in solution: Dependabot.

The Problem with NuGet Dependencies

Adding a package is simple:

dotnet add package System.Data.SqlClient --version 4.8.4

The application builds. Everything works as expected.

But there’s a hidden risk. That version might already have a known vulnerability (a CVE). Unless you actively check, you won’t know. And by the time it’s discovered, it could already be in production.

This is a common pattern:

• Packages become outdated quietly
  

• Vulnerabilities are disclosed later
  

• Applications continue running with known risks
  

Dependency issues are rarely obvious during development, which is what makes them dangerous.

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What Dependabot Actually Does

Dependabot is GitHub’s built-in dependency monitoring tool. Once enabled, it works in the background and takes care of several things automatically:

• Scans your project dependencies
  

• Detects known vulnerabilities
  

• Notifies you through security alerts
  

• Creates pull requests with safe updates
  

It’s not a replacement for good security practices, but it removes a lot of the manual work.

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Step 1: Enable Dependabot

In your GitHub repository, go to:

Settings → Security → Code security and analysis

Enable the following:

• Dependency graph
  

• Dependabot alerts
  

• Dependabot security updates
  

Once these are turned on, GitHub starts analyzing your dependencies automatically.

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Step 2: Let GitHub Do the Scanning

After enabling these features, GitHub will scan your .csproj files and identify vulnerable packages.

If a vulnerability is found, you’ll see an alert like this:

System.Data.SqlClient 4.8.4 → High severity vulnerability

You don’t need to run any tools manually. The scanning happens continuously in the background.

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Step 3: Configure Automatic Updates

To make Dependabot proactive, add a configuration file to your repository:

.github/dependabot.yml

Example:

version: 2
updates:
  - package-ecosystem: “nuget”
    directory: “/”
    schedule:
      interval: “daily”

This tells GitHub to check for dependency updates every day.

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Step 4: How Dependabot Fixes Issues

When a vulnerability is detected and a fix is available, Dependabot will open a pull request automatically.

A typical PR looks like this:

Title:

Bump System.Data.SqlClient from 4.8.4 to 4.8.5

Description:

Fixes CVE-2024-0056

This update resolves a high severity vulnerability.

At this point, the process is straightforward. You review the change, run your tests, and merge.

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Step 5: Optional Local Verification

If you want to double-check locally, you can still run:

dotnet list package --vulnerable

This is useful during development, but once Dependabot is enabled, it’s no longer something you need to rely on.

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Good Practices to Follow

Dependabot works best when combined with a few simple habits:

• Keep updates frequent rather than batching them
  

• Review and merge security PRs promptly
  

• Avoid packages that are no longer maintained
  

• Be aware of transitive dependencies (packages you don’t directly install)
  

These small steps significantly reduce your risk over time.

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Where Tools Like Depadbot Fit

Dependabot solves the basics well: detection and automated updates.

Tools like Depadbot build on top of that by providing deeper analysis, better visibility into dependency chains, and more context around risk.

If Dependabot helps you react to vulnerabilities, tools like Depadbot help you understand and prioritize them.

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Final Thoughts

Dependency security doesn’t need to be complicated.

You don’t need a full security pipeline to get started. Enabling Dependabot takes a few minutes, and from that point on, your repository is continuously monitored.

It’s a small change, but it closes a gap that many teams overlook.

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One thing to remember

If Dependabot isn’t enabled, your dependencies are aging silently and you probably won’t notice until it’s too late.

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👉 Full working code available at:

🔗 https://github.com/KanaiyaKatarmal/githuazureterraform

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I hope you found this guide helpful and informative.

Thanks for reading!

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