diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9c28177..b327d7d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ for the list of changes in SaltStack.
 - Install `libgit2 1.3.0` from source
 - Install `pygit2 1.7.0` from pip repositories
 - Change Docker base image to `ubuntu:hirsute-20210917`
+- Upgrade Python to version `3.9`
 
 **3004**
 
diff --git a/Dockerfile b/Dockerfile
index 3b39c48..28c2b32 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,7 @@ ARG VCS_REF
 
 # https://github.com/saltstack/salt/releases
 ENV SALT_VERSION="3004" \
-    PYTHON_VERSION="3.8"
+    PYTHON_VERSION="3.9"
 
 ENV IMAGE_VERSION="${SALT_VERSION}_1"