diff --git a/CHANGES.md b/CHANGES.md
index 729d174..5947e73 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -11,7 +11,7 @@
 
 - More fine grained control over plone site creation and purging.
 
-- Drop Python 3.8 in tests.
+- Drop Python 3.8 and set all defaults to a Python 3.9 minimum.
 
 ## 1.0a5 (2024-06-07)
 
diff --git a/Makefile b/Makefile
index 6342d58..8b73f1f 100644
--- a/Makefile
+++ b/Makefile
@@ -51,7 +51,7 @@ PRIMARY_PYTHON?=python3
 
 # Minimum required Python version.
 # Default: 3.7
-PYTHON_MIN_VERSION?=3.7
+PYTHON_MIN_VERSION?=3.9
 
 # Install packages using the given package installer method.
 # Supported are `pip` and `uv`. If uv is used, its global availability is
diff --git a/src/mxmake/topics/core/mxenv.mk b/src/mxmake/topics/core/mxenv.mk
index 3157388..c352fcf 100644
--- a/src/mxmake/topics/core/mxenv.mk
+++ b/src/mxmake/topics/core/mxenv.mk
@@ -28,7 +28,7 @@
 #:
 #:[setting.PYTHON_MIN_VERSION]
 #:description = Minimum required Python version.
-#:default = 3.7
+#:default = 3.9
 #:
 #:[setting.PYTHON_PACKAGE_INSTALLER]
 #:description = Install packages using the given package installer method.