diff --git a/install.sh b/install.sh
index 82d4381..54dd499 100755
--- a/install.sh
+++ b/install.sh
@@ -25,6 +25,8 @@ sudo chsh -s /usr/bin/fish $USER
 # config.
 git config --global include.path .gitconfig.shared
 
-# Install blacken and prettier
+# Install blacken and prettier and some versions of python.
 pip3 install --index-url=https://pypi.org/simple black
 sudo npm install -g prettier
+brew install python@3.9 python@3.10 python@3.11
+curl -sSL https://install.python-poetry.org | python3 -