diff --git a/Changelog.md b/Changelog.md
index d746537e..2ef0a01d 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -3,6 +3,7 @@ All notable changes to this project will be documented here.
 
 ## [unreleased]
 - Add tidyverse as a default R tester package (#512)
+- haskell tester: make stack resolver a setting (#515)
 
 ## [v2.4.2]
 - Ensure _env_status is updated to "setup" earlier when a request to update test settings is made (#499)
diff --git a/docker-compose.yml b/docker-compose.yml
index 90b52b1c..351e49a6 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -19,6 +19,7 @@ services:
       - SUPERVISOR_URL=127.0.0.1:9001
       - AUTOTESTER_CONFIG=/app/.dockerfiles/docker-config.yml
       - STACK_ROOT=/home/docker/.autotesting/.stack
+      - STACK_RESOLVER=lts-16.17
     depends_on:
       - postgres
       - redis
diff --git a/server/autotest_server/__init__.py b/server/autotest_server/__init__.py
index 217421e3..4d26d1b4 100644
--- a/server/autotest_server/__init__.py
+++ b/server/autotest_server/__init__.py
@@ -396,6 +396,8 @@ def update_test_settings(user, settings_id, test_settings, file_url):
             default_env = os.path.join(TEST_SCRIPT_DIR, DEFAULT_ENV_DIR)
             if not os.path.isdir(default_env):
                 subprocess.run([sys.executable, "-m", "venv", default_env], check=True)
+                requirements_path = os.path.join(os.path.dirname(__file__), "../requirements.txt")
+                subprocess.run([f"{default_env}/bin/pip", "install", "-r", requirements_path], check=True)
             try:
                 tester_settings["_env"] = tester_install.create_environment(tester_settings, env_dir, default_env)
             except Exception as e:
diff --git a/server/autotest_server/settings.yml b/server/autotest_server/settings.yml
index 0325289b..4d32c71f 100644
--- a/server/autotest_server/settings.yml
+++ b/server/autotest_server/settings.yml
@@ -1,6 +1,7 @@
 workspace: !ENV ${WORKSPACE}
 redis_url: !ENV ${REDIS_URL}
 supervisor_url: !ENV ${SUPERVISOR_URL}
+stack_resolver: !ENV ${STACK_RESOLVER}
 workers:
   - user: !ENV ${USER}
     queues:
diff --git a/server/autotest_server/testers/haskell/haskell_tester.py b/server/autotest_server/testers/haskell/haskell_tester.py
index 754e3c25..f22c0718 100644
--- a/server/autotest_server/testers/haskell/haskell_tester.py
+++ b/server/autotest_server/testers/haskell/haskell_tester.py
@@ -6,8 +6,9 @@
 
 from ..tester import Tester, Test, TestError
 from ..specs import TestSpecs
+from config import config
 
-STACK_OPTIONS = ["--resolver=lts-16.17", "--system-ghc", "--allow-different-user"]
+STACK_OPTIONS = [f"--resolver={config['stack_resolver']}", "--system-ghc", "--allow-different-user"]
 
 
 class HaskellTest(Test):
diff --git a/server/autotest_server/testers/haskell/setup.py b/server/autotest_server/testers/haskell/setup.py
index 43f8090c..77e4ab9d 100644
--- a/server/autotest_server/testers/haskell/setup.py
+++ b/server/autotest_server/testers/haskell/setup.py
@@ -1,13 +1,13 @@
 import os
 import json
 import subprocess
-
+from ...config import config
 
 HASKELL_TEST_DEPS = ["tasty-discover", "tasty-quickcheck"]
 
 
 def create_environment(_settings, _env_dir, default_env_dir):
-    resolver = "lts-16.17"
+    resolver = config["stack_resolver"]
     cmd = ["stack", "build", "--resolver", resolver, "--system-ghc", *HASKELL_TEST_DEPS]
     subprocess.run(cmd, check=True)
 
@@ -16,7 +16,7 @@ def create_environment(_settings, _env_dir, default_env_dir):
 
 def install():
     subprocess.run(os.path.join(os.path.dirname(os.path.realpath(__file__)), "requirements.system"), check=True)
-    resolver = "lts-16.17"
+    resolver = config["stack_resolver"]
     cmd = ["stack", "build", "--resolver", resolver, "--system-ghc", *HASKELL_TEST_DEPS]
     subprocess.run(cmd, check=True)
     subprocess.run(