diff --git a/Changelog.md b/Changelog.md
index d2ea60ac..7b1efc4c 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,6 +1,10 @@
 # CHANGELOG
 All notable changes to this project will be documented here.
 
+## [v2.4.1]
+- Fix bug that prevented copies of instructor directories from being deleted (#483)
+- Add STACK_ROOT to containers as well as notes in readme (#484)
+
 ## [v2.4.0]
 - Fix bug that prevented test results from being returned when a feedback file could not be found (#458)
 - Add support for Python 3.11 and 3.12 (#467)
diff --git a/README.md b/README.md
index 2486b0a7..f159fe9d 100644
--- a/README.md
+++ b/README.md
@@ -147,6 +147,7 @@ Installing each tester will also install the following additional packages (syst
 - `haskell`
     - ghc 
     - cabal-install 
+    - haskell-stack
     - tasty-stats (cabal package)
     - tasty-discover (cabal package)
     - tasty-quickcheck (cabal package)
@@ -259,6 +260,10 @@ ERROR_LOG= # file to write error log informatoin to (default is stderr)
 SETTINGS_JOB_TIMEOUT= # the maximum runtime (in seconds) of a job that updates settings before it is interrupted (default is 60) 
 ```
 
+## Stack configuration
+The Haskell autotester uses [stack](https://docs.haskellstack.org/en/stable/) to install and manage Haskell packages. By default, stack will install to `${HOME}/.stack`, where `${HOME}` is the home directory of the user running the autotester.
+The installation location can be configured by setting a `$STACK_ROOT`, such as the root of the workspace directory.
+
 ## MarkUs configuration options
 
 After installing the autotester and the API, the next step is to [register the MarkUs instance with the autotester](https://github.com/MarkUsProject/Markus/wiki/Installation#autotester-installation-steps).
diff --git a/docker-compose.yml b/docker-compose.yml
index 49ffa6b2..fbc3fc49 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -18,6 +18,7 @@ services:
       - WORKSPACE=/home/docker/.autotesting
       - SUPERVISOR_URL=127.0.0.1:9001
       - AUTOTESTER_CONFIG=/app/.dockerfiles/docker-config.yml
+      - STACK_ROOT=/home/docker/.autotesting/.stack
     depends_on:
       - postgres
       - redis
diff --git a/server/autotest_server/__init__.py b/server/autotest_server/__init__.py
index c3706fa5..6f2ee12d 100644
--- a/server/autotest_server/__init__.py
+++ b/server/autotest_server/__init__.py
@@ -254,9 +254,9 @@ def _clear_working_directory(tests_path: str, test_username: str) -> None:
     Run commands that clear the tests_path working directory
     """
     if test_username != getpass.getuser():
-        chmod_cmd = f"sudo -u {test_username} -- bash -c 'chmod -Rf ugo+rwX {tests_path}'"
+        chmod_cmd = f"sudo -u {test_username} -- bash -c 'chmod -Rf -t ugo+rwX {tests_path}'"
     else:
-        chmod_cmd = f"chmod -Rf ugo+rwX {tests_path}"
+        chmod_cmd = f"chmod -Rf -t ugo+rwX {tests_path}"
 
     subprocess.run(chmod_cmd, shell=True)