diff --git a/RELEASE.md b/RELEASE.md
new file mode 100644
index 0000000..a46f04f
--- /dev/null
+++ b/RELEASE.md
@@ -0,0 +1,3 @@
+Release type: patch
+
+Update the dependencies so that Mau 2.x is not installed, as that will introduce API changes.
diff --git a/pyproject.toml b/pyproject.toml
index 35d5394..8c83af1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -31,7 +31,7 @@ classifiers = [
 python = ">=3.6.2,<4.0"
 pelican = ">=4.5"
 markdown = {version = ">=3.2", optional = true}
-mau = ">=1.4.0"
+mau = ">=1.4.0,<2.0"
 
 [tool.poetry.dev-dependencies]
 black = {version = "^21.4b2", allow-prereleases = true}