diff --git a/ci/run_evs_be_test.py b/ci/run_evs_be_test.py
index f7b705b0f47e100ead67786d6730f7024461ebc9..4c8ad1daee07897f23f64ecbe3680d6e506b6d66 100755
--- a/ci/run_evs_be_test.py
+++ b/ci/run_evs_be_test.py
@@ -54,7 +54,7 @@ def main():
 
     result_dict = dict()
     # run first part in parallel
-    with concurrent.futures.ThreadPoolExecutor(max_workers=4) as executor:
+    with concurrent.futures.ThreadPoolExecutor() as executor:
         executor.map(
             run_file, README_FILES_PARALLEL, BIN_PATHS, [result_dict] * len(README_FILES_PARALLEL)
         )