How to Keep Your Git Fork Synced with the Upstream Repository
Set the upstream remote with "git remote add upstream [URL]" to link your fork to the original repository. 2. Fetch changes from upstream using "git fetch upstream" to download the latest updates. 3. Merge them into your local main branch with "git checkout main" followed by "git merge upstream/main". 4. Push the updated branch to your fork via "git push origin main" to keep it synchronized, and optionally create a Git alias for faster syncing in the future.
Keeping your Git fork synced with the original (upstream) repository is essential when contributing to open-source projects. Over time, the main project evolves, and if you don’t stay up to date, your fork can fall behind—leading to merge conflicts or outdated code. Here’s how to keep your fork in sync, step by step.
1. Set Up the Upstream Remote
When you fork a repository on GitHub, your local clone only knows about your fork (the origin remote). To sync changes from the original project, you need to add a reference to it—called the upstream remote.
Run this command once (replace the URL with the original repo’s URL):
git remote add upstream https://github.com/ORIGINAL-OWNER/ORIGINAL-REPO.git
You can verify it was added:
git remote -v
You should see both origin (your fork) and upstream (the original).
? Pro tip: Use
git remote set-url upstream ...if you ever need to change the upstream URL.
2. Fetch Changes from Upstream
To bring in the latest changes from the original repository, fetch from the upstream:
git fetch upstream
This downloads all the latest branches and commits from the main repo, but doesn’t apply them yet.
upstream/mainnow points to the latest main branch of the original repo.- Your local
mainand your fork’smainremain unchanged at this point.
3. Sync Your Local Main Branch
Now, switch to your local main branch and merge the upstream changes:
git checkout main git merge upstream/main
This updates your local main branch to match the original project.
Alternatively, if you prefer a clean history and don’t mind rewriting your local branch (only do this if you haven’t added local commits), you can rebase:
git rebase upstream/main
4. Push Updates to Your Fork
After syncing locally, push the updated main branch to your fork on GitHub:
git push origin main
Now your online fork is also up to date with the original repository.
Bonus: Automate or Simplify the Process
You can create a Git alias to reduce typing. Add this to your .gitconfig:
[alias]
sync = "!git fetch upstream && git checkout main && git merge upstream/main && git push origin main"Then just run:
git sync
⚠️ Warning: Only use this if you’re on the
mainbranch and have no uncommitted changes.
When Should You Sync?
- Before starting a new feature or bug fix – ensures you’re building on the latest code.
- When you see merge conflicts in a PR – often means your fork is out of date.
- Periodically, if you’re actively contributing.
Keeping your fork updated isn’t hard—once you set up the upstream remote, it’s just a few commands. Do it regularly, and you’ll avoid headaches down the road.
Basically: set upstream once, then fetch → merge → push whenever needed.
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