diff --git a/action.yaml b/action.yaml
index 62cbd1da8..8838ca3eb 100644
--- a/action.yaml
+++ b/action.yaml
@@ -230,4 +230,6 @@ runs:
 
   - name: Install
     shell: bash
-    run: sudo python3 -m pip install git+https://github.com/systemd/mkosi.git
+    run: sudo python3 -m pip install git+https://github.com/systemd/mkosi.git@$MKOSI_TAG
+    env:
+      MKOSI_TAG: v9
diff --git a/mkosi/__init__.py b/mkosi/__init__.py
index 4d901949a..075f1b15c 100644
--- a/mkosi/__init__.py
+++ b/mkosi/__init__.py
@@ -58,7 +58,7 @@
 from .printer import MkosiPrinter
 
 
-__version__ = "8"
+__version__ = "9"
 
 
 # These types are only generic during type checking and not at runtime, leading
diff --git a/setup.py b/setup.py
index a739b0adb..d6bb83916 100755
--- a/setup.py
+++ b/setup.py
@@ -18,7 +18,7 @@ def run(self):
 
 setup(
     name="mkosi",
-    version="8",
+    version="9",
     description="Create legacy-free OS images",
     url="https://github.com/systemd/mkosi",
     maintainer="mkosi contributors",
diff --git a/tools/do-a-release.sh b/tools/do-a-release.sh
index 6b82ed04c..8848a9eb1 100755
--- a/tools/do-a-release.sh
+++ b/tools/do-a-release.sh
@@ -7,9 +7,10 @@ if [ x"$1" == x ] ; then
 fi
 
 sed -i 's/version=".*",/version="'"$1"'",/' setup.py
-sed -i "s/__version__ = '.*'/__version__ = '$1'/" mkosi/__init__.py
+sed -i "s/__version__ = \".*\"/__version__ = \"$1\"/" mkosi/__init__.py
+sed -i "s/MKOSI_TAG: '.*'/MKOSI_TAG: $1/" action.yaml
 
-git add -p setup.py mkosi
+git add -p setup.py mkosi action.yaml
 
 pandoc -t man -s -o man/mkosi.1 mkosi.md
 git add man/mkosi.1