diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f9b2b9d8..6207c8a2 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -7,6 +7,7 @@ build-doc:
   stage: build
   only:
     - master@poezio/poezio
+    - main@poezio/poezio
   tags:
     - www
   image: python:3
@@ -30,6 +31,7 @@ build-ubuntu:
       - dist/
   only:
     - master
+    - main
 
 security-check:
   stage: lint
diff --git a/doc/source/dev/contributing.rst b/doc/source/dev/contributing.rst
index 8d386c87..79737b25 100644
--- a/doc/source/dev/contributing.rst
+++ b/doc/source/dev/contributing.rst
@@ -38,8 +38,8 @@ useless merges (and polluting the commit history) when none is needed.
 .. code-block:: bash
 
     git fetch origin
-    git rebase origin/master
-    git push origin master
+    git rebase origin/main
+    git push origin main
 
 If your commit is related to an issue on our tracker_ (or fixes such an
 issue), you can use ``Fix #BUGID`` or ``References #BUGID`` to help with the
diff --git a/update.sh b/update.sh
index 81989e57..677aa03e 100755
--- a/update.sh
+++ b/update.sh
@@ -27,6 +27,26 @@ $POEZIO_PYTHON -c 'import venv' &> /dev/null || {
     exit 1
 }
 
+# XXX: Migration from master branch to main
+branch=$(git rev-parse --abbrev-ref HEAD)
+changes=$(git status --porcelain | grep -v "^??")
+if [ "$branch" == "master" ]; then
+  echo "! WARNING !"
+  echo "We are changing our default branch to 'main' and we have detected"
+  echo "you are still using 'master'."
+  echo
+
+  if [ -n "$changes" ]; then
+    echo "! Manual action required !"
+    echo "There are uncommited changes in your staging area. Please sort this"
+    echo "out and then manually checkout the 'main' branch using 'git checkout main'."
+    exit 1
+  fi
+
+  git checkout main
+  echo "Automatically switched to 'main' branch."
+fi
+
 echo 'Updating poezio'
 git pull --ff-only origin master || {
     echo "The script failed to update poezio."