diff --git a/Changelog.md b/Changelog.md
index 7248b0be..366f3570 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)
+- For the Haskell tester, make stack resolver a test setting (#526)
 
 ## [v2.4.3]
 - Omit skipped test cases in Python tester (#522)
diff --git a/server/autotest_server/testers/haskell/haskell_tester.py b/server/autotest_server/testers/haskell/haskell_tester.py
index 754e3c25..c0ba5f4c 100644
--- a/server/autotest_server/testers/haskell/haskell_tester.py
+++ b/server/autotest_server/testers/haskell/haskell_tester.py
@@ -7,8 +7,6 @@
 from ..tester import Tester, Test, TestError
 from ..specs import TestSpecs
 
-STACK_OPTIONS = ["--resolver=lts-16.17", "--system-ghc", "--allow-different-user"]
-
 
 class HaskellTest(Test):
     def __init__(
@@ -101,6 +99,8 @@ def run_haskell_tests(self) -> Dict[str, List[Dict[str, Union[int, str]]]]:
         Tests are run by first discovering all tests from a specific module (using tasty-discover)
         and then running all the discovered tests and parsing the results from a csv file.
         """
+        resolver = self.specs["env_data", "resolver_version"]
+        STACK_OPTIONS = [f"--resolver={resolver}", "--system-ghc", "--allow-different-user"]
         results = {}
         this_dir = os.getcwd()
         haskell_lib = os.path.join(os.path.dirname(os.path.realpath(__file__)), "lib")
diff --git a/server/autotest_server/testers/haskell/settings_schema.json b/server/autotest_server/testers/haskell/settings_schema.json
index f034c97c..5fd49f3d 100644
--- a/server/autotest_server/testers/haskell/settings_schema.json
+++ b/server/autotest_server/testers/haskell/settings_schema.json
@@ -1,5 +1,8 @@
 {
   "type": "object",
+  "required": [
+    "env_data"
+  ],
   "properties": {
     "tester_type": {
       "type": "string",
@@ -7,6 +10,20 @@
         "haskell"
       ]
     },
+    "env_data": {
+      "title": "Haskell environment",
+      "type": "object",
+      "required": [
+        "resolver_version"
+      ],
+      "properties": {
+        "resolver_version": {
+          "title": "Resolver version",
+          "type": "string",
+          "default": null
+        }
+      }
+    },
     "test_data": {
       "title": "Test Groups",
       "type": "array",
diff --git a/server/autotest_server/testers/haskell/setup.py b/server/autotest_server/testers/haskell/setup.py
index 43f8090c..f1b3efa0 100644
--- a/server/autotest_server/testers/haskell/setup.py
+++ b/server/autotest_server/testers/haskell/setup.py
@@ -2,12 +2,13 @@
 import json
 import subprocess
 
-
 HASKELL_TEST_DEPS = ["tasty-discover", "tasty-quickcheck"]
+STACK_RESOLVER = "lts-16.17"
 
 
 def create_environment(_settings, _env_dir, default_env_dir):
-    resolver = "lts-16.17"
+    env_data = _settings.get("env_data", {})
+    resolver = env_data.get("resolver_version", STACK_RESOLVER)
     cmd = ["stack", "build", "--resolver", resolver, "--system-ghc", *HASKELL_TEST_DEPS]
     subprocess.run(cmd, check=True)
 
@@ -16,7 +17,7 @@ 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 = STACK_RESOLVER
     cmd = ["stack", "build", "--resolver", resolver, "--system-ghc", *HASKELL_TEST_DEPS]
     subprocess.run(cmd, check=True)
     subprocess.run(
@@ -26,4 +27,7 @@ def install():
 
 def settings():
     with open(os.path.join(os.path.dirname(os.path.realpath(__file__)), "settings_schema.json")) as f:
-        return json.load(f)
+        settings_ = json.load(f)
+    resolver_versions = settings_["properties"]["env_data"]["properties"]["resolver_version"]
+    resolver_versions["default"] = STACK_RESOLVER
+    return settings_