diff --git a/lua/neotest-python/pytest.lua b/lua/neotest-python/pytest.lua
index d462158..b30469e 100644
--- a/lua/neotest-python/pytest.lua
+++ b/lua/neotest-python/pytest.lua
@@ -53,7 +53,7 @@ end
 ---@param positions neotest.Tree
 ---@param root string
 local function discover_params(python, script, path, positions, root)
-  local cmd = vim.tbl_flatten({ python, script, "--pytest-collect", path })
+  local cmd = vim.iter({ python, script, "--pytest-collect", path }):flatten():totable()
   logger.debug("Running test instance discovery:", cmd)
 
   local test_params = {}
@@ -66,7 +66,7 @@ local function discover_params(python, script, path, positions, root)
     return {}
   end
 
-  for line in vim.gsplit(data.stdout, "\n", true) do
+  for line in vim.gsplit(data.stdout, "\n", { plain = true }) do
     local param_index = string.find(line, "[", nil, true)
     if param_index then
       local test_id = root .. lib.files.path.sep .. string.sub(line, 1, param_index - 1)
diff --git a/neotest_python/pytest.py b/neotest_python/pytest.py
index e12beb2..889bda7 100644
--- a/neotest_python/pytest.py
+++ b/neotest_python/pytest.py
@@ -1,6 +1,7 @@
 from io import StringIO
 import json
 from pathlib import Path
+import re
 from typing import Callable, Dict, List, Optional, Union
 
 import pytest
@@ -10,6 +11,7 @@ from _pytest.fixtures import FixtureLookupErrorRepr
 
 from .base import NeotestAdapter, NeotestError, NeotestResult, NeotestResultStatus
 
+ANSI_ESCAPE = re.compile(r'\x1B(?:[@-Z\\-_]|\[[0-?]*[ -/]*[@-~])')
 
 class PytestNeotestAdapter(NeotestAdapter):
     def __init__(self, emit_parameterized_ids: bool):
@@ -131,7 +133,7 @@ class NeotestResultCollector:
                 errors.append({"message": msg_prefix + exc_repr, "line": None})
             # Test failed internally
             elif isinstance(exc_repr, ExceptionRepr):
-                error_message = exc_repr.reprcrash.message  # type: ignore
+                error_message = ANSI_ESCAPE.sub('', exc_repr.reprcrash.message)  # type: ignore
                 error_line = None
                 for traceback_entry in reversed(call.excinfo.traceback):
                     if str(traceback_entry.path) == abs_path: