diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5ff738e5..0054cf23 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## [Unreleased](https://github.com/TypedDevs/bashunit/compare/0.17.0...main)
 
 - Added `-p|--parallel` to enable running tests in parallel
+    - Enabled only in macOS and Ubuntu
 - Added `assert_file_contains` and `assert_file_not_contains`
 - Added `assert_true` and `assert_false`
 - Added `BASHUNIT_DEV_LOG`
diff --git a/Makefile b/Makefile
index a4605d0b..d26f1879 100644
--- a/Makefile
+++ b/Makefile
@@ -72,6 +72,10 @@ docker/alpine:
 	@docker run --rm -it -v "$(shell pwd)":/project -w /project alpine:latest \
 		sh -c  "apk add bash make shellcheck git && bash"
 
+docker/ubuntu:
+	@docker run --rm -it -v "$(shell pwd)":/project -w /project ubuntu:latest \
+		sh -c "apt update && apt install -y bash make shellcheck git && bash"
+
 env/example:
 	@echo "Copying variables without the values from .env into .env.example"
 	@sed 's/=.*/=/' .env > .env.example
diff --git a/src/globals.sh b/src/globals.sh
index 4ff70e2c..748bf524 100644
--- a/src/globals.sh
+++ b/src/globals.sh
@@ -50,6 +50,10 @@ function cleanup_temp_files() {
 
 # shellcheck disable=SC2145
 function log() {
+  if ! env::is_dev_mode_enabled; then
+    return
+  fi
+
   local level="$1"
   shift
 
diff --git a/src/main.sh b/src/main.sh
index f610b726..aa867a39 100644
--- a/src/main.sh
+++ b/src/main.sh
@@ -19,23 +19,25 @@ function main::exec_tests() {
   trap 'main::cleanup' SIGINT
   trap '[[ $? -eq $EXIT_CODE_STOP_ON_FAILURE ]] && main::handle_stop_on_failure_sync' EXIT
 
-  if env::is_parallel_run_enabled && check_os::is_alpine; then
-    printf "%sWarning: Parallel test execution on Alpine Linux is currently" "${_COLOR_INCOMPLETE}"
-    printf "in a beta stage.\nThis means there may be unresolved issues, "
-    printf "particularly involving race conditions.%s\n" "${_COLOR_DEFAULT}"
+  if env::is_parallel_run_enabled && ! parallel::is_enabled; then
+    printf "%sWarning: Parallel tests are working only for macOS and Ubuntu.\n" "${_COLOR_INCOMPLETE}"
+    printf "For other OS (Linux/Alpine, Windows), --parallel is not enabled due to inconsistent results,\n"
+    printf "particularly involving race conditions.%s " "${_COLOR_DEFAULT}"
+    printf "%sFallback using --no-parallel%s\n" "${_COLOR_SKIPPED}" "${_COLOR_DEFAULT}"
   fi
 
-  if env::is_parallel_run_enabled; then
+  if parallel::is_enabled; then
     parallel::reset
   fi
 
   console_header::print_version_with_env "$filter" "${test_files[@]}"
   runner::load_test_files "$filter" "${test_files[@]}"
-  if env::is_parallel_run_enabled; then
+
+  if parallel::is_enabled; then
     wait
   fi
 
-  if env::is_parallel_run_enabled && parallel::must_stop_on_failure; then
+  if parallel::is_enabled && parallel::must_stop_on_failure; then
     printf "\r%sStop on failure enabled...%s\n"  "${_COLOR_SKIPPED}" "${_COLOR_DEFAULT}"
   fi
 
diff --git a/src/parallel.sh b/src/parallel.sh
index e4a0163c..4412e715 100755
--- a/src/parallel.sh
+++ b/src/parallel.sh
@@ -83,3 +83,10 @@ function parallel::reset() {
   rm -rf "$TEMP_DIR_PARALLEL_TEST_SUITE"
   [ -f "$TEMP_FILE_PARALLEL_STOP_ON_FAILURE" ] && rm "$TEMP_FILE_PARALLEL_STOP_ON_FAILURE"
 }
+
+function parallel::is_enabled() {
+  if env::is_parallel_run_enabled && (check_os::is_macos || check_os::is_ubuntu); then
+    return 0
+  fi
+  return 1
+}
diff --git a/src/runner.sh b/src/runner.sh
index e46c3124..aa80890c 100755
--- a/src/runner.sh
+++ b/src/runner.sh
@@ -13,7 +13,7 @@ function runner::load_test_files() {
     # shellcheck source=/dev/null
     source "$test_file"
     runner::run_set_up_before_script
-    if env::is_parallel_run_enabled; then
+    if parallel::is_enabled; then
       runner::call_test_functions "$test_file" "$filter" 2>/dev/null &
     else
       runner::call_test_functions "$test_file" "$filter"
@@ -22,7 +22,7 @@ function runner::load_test_files() {
     runner::clean_set_up_and_tear_down_after_script
   done
 
-  if env::is_parallel_run_enabled; then
+  if parallel::is_enabled; then
     wait
     runner::spinner &
     local spinner_pid=$!
@@ -74,14 +74,14 @@ function runner::call_test_functions() {
     return
   fi
 
-  if ! env::is_simple_output_enabled && ! env::is_parallel_run_enabled; then
+  if ! env::is_simple_output_enabled && ! parallel::is_enabled; then
     echo "Running $script"
   fi
 
   helper::check_duplicate_functions "$script" || true
 
   for function_name in "${functions_to_run[@]}"; do
-    if env::is_parallel_run_enabled && parallel::must_stop_on_failure; then
+    if parallel::is_enabled && parallel::must_stop_on_failure; then
       break
     fi
 
@@ -193,7 +193,7 @@ function runner::run_test() {
     runner::write_failure_result_output "$test_file" "$subshell_output"
 
     if env::is_stop_on_failure_enabled; then
-      if env::is_parallel_run_enabled; then
+      if parallel::is_enabled; then
         parallel::mark_stop_on_failure
       else
         exit "$EXIT_CODE_STOP_ON_FAILURE"
@@ -249,7 +249,7 @@ function runner::parse_result() {
   shift
   local args=("$@")
 
-  if env::is_parallel_run_enabled; then
+  if parallel::is_enabled; then
     runner::parse_result_parallel "$function_name" "$execution_result" "${args[@]}"
   else
     runner::parse_result_sync "$function_name" "$execution_result"
@@ -349,7 +349,12 @@ function runner::write_failure_result_output() {
   local test_file=$1
   local error_msg=$2
 
-  echo -e "$(state::get_tests_failed)) $test_file\n$error_msg" >> "$FAILURES_OUTPUT_PATH"
+  local test_nr="*"
+  if ! parallel::is_enabled; then
+    test_nr=$(state::get_tests_failed)
+  fi
+
+  echo -e "$test_nr) $test_file\n$error_msg" >> "$FAILURES_OUTPUT_PATH"
 }
 
 function runner::run_set_up() {
diff --git a/src/state.sh b/src/state.sh
index 03078121..6eea2dbf 100644
--- a/src/state.sh
+++ b/src/state.sh
@@ -205,7 +205,7 @@ function state::print_line() {
     *)                char="?" && log "warning" "unknown test type '$type'" ;;
   esac
 
-  if env::is_parallel_run_enabled; then
+  if parallel::is_enabled; then
       printf "%s" "$char"
   else
     if (( _TOTAL_TESTS_COUNT % 50 == 0 )); then
diff --git a/tests/unit/globals_test.sh b/tests/unit/globals_test.sh
index cf879169..e8d4aa28 100644
--- a/tests/unit/globals_test.sh
+++ b/tests/unit/globals_test.sh
@@ -10,6 +10,14 @@ function tear_down() {
   rm "$BASHUNIT_DEV_LOG"
 }
 
+function set_up_before_script() {
+  export BASHUNIT_DEV_MODE=true
+}
+
+function tear_down_after_script() {
+  export BASHUNIT_DEV_MODE=$_DEFAULT_DEV_MODE
+}
+
 function test_globals_current_dir() {
   assert_same "tests/unit" "$(current_dir)"
 }