diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 6e3a0ab..9340bff 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -13,7 +13,7 @@ jobs:
   test:
 
     name: build
-    runs-on: inseven-macos-14
+    runs-on: inseven-macos-26
 
     steps:
 
diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..f1c0c50
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1 @@
+python 3.12.1
diff --git a/scripts/environment.sh b/scripts/environment.sh
index 13d77a4..35660c3 100755
--- a/scripts/environment.sh
+++ b/scripts/environment.sh
@@ -20,12 +20,17 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
+ROOT_DIRECTORY="$( cd "$( dirname "$( dirname "${BASH_SOURCE[0]}" )" )" &> /dev/null && pwd )"
+SCRIPTS_DIRECTORY="$ROOT_DIRECTORY/scripts"
 
-SCRIPTS_DIRECTORY="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
-ROOT_DIRECTORY="${SCRIPTS_DIRECTORY}/.."
+export LOCAL_TOOLS_PATH="$ROOT_DIRECTORY/.local"
 
-export PYTHONUSERBASE="${ROOT_DIRECTORY}/.local/python"
-mkdir -p "$PYTHONUSERBASE"
-export PATH="${PYTHONUSERBASE}/bin":$PATH
+export BIN_DIRECTORY="$ROOT_DIRECTORY/.local/bin"
+export PATH=$BIN_DIRECTORY:$PATH
 
-export PATH=$PATH:"${SCRIPTS_DIRECTORY}/changes"
+source "$LOCAL_TOOLS_PATH/python/bin/activate"
+
+export PIPENV_VENV_IN_PROJECT=1
+export PIPENV_IGNORE_VIRTUALENVS=1
+
+export PATH=$PATH:"$SCRIPTS_DIRECTORY/changes"
diff --git a/scripts/install-dependencies.sh b/scripts/install-dependencies.sh
index 79de4f6..db66820 100755
--- a/scripts/install-dependencies.sh
+++ b/scripts/install-dependencies.sh
@@ -25,13 +25,29 @@ set -o pipefail
 set -x
 set -u
 
-SCRIPTS_DIRECTORY="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
-ROOT_DIRECTORY="${SCRIPTS_DIRECTORY}/.."
-CHANGES_DIRECTORY="${SCRIPTS_DIRECTORY}/changes"
+ROOT_DIRECTORY="$( cd "$( dirname "$( dirname "${BASH_SOURCE[0]}" )" )" &> /dev/null && pwd )"
+SCRIPTS_DIRECTORY="$ROOT_DIRECTORY/scripts"
 
-ENVIRONMENT_PATH="${SCRIPTS_DIRECTORY}/environment.sh"
+LOCAL_TOOLS_PATH="$ROOT_DIRECTORY/.local"
+CHANGES_DIRECTORY="$SCRIPTS_DIRECTORY/changes"
+BUILD_TOOLS_DIRECTORY="$SCRIPTS_DIRECTORY/build-tools"
 
-source "$ENVIRONMENT_PATH"
+# Install tools defined in `.tool-versions`.
+cd "$ROOT_DIRECTORY"
+mise install
 
-# Install the Python dependencies
+# Clean up and recreate the local tools directory.
+if [ -d "$LOCAL_TOOLS_PATH" ] ; then
+    rm -r "$LOCAL_TOOLS_PATH"
+fi
+mkdir -p "$LOCAL_TOOLS_PATH"
+
+# Set up a Python venv to bootstrap our python dependency on `pipenv`.
+python -m venv "$LOCAL_TOOLS_PATH/python"
+
+# Source `environment.sh` to ensure the remainder of our paths are set up correctly.
+source "$SCRIPTS_DIRECTORY/environment.sh"
+
+# Install the Python dependencies.
+pip install --upgrade pip pipenv wheel certifi
 PIPENV_PIPFILE="$CHANGES_DIRECTORY/Pipfile" pipenv install