diff --git a/gobrew_test.go b/gobrew_test.go
index 52daf35..eb6c487 100644
--- a/gobrew_test.go
+++ b/gobrew_test.go
@@ -26,7 +26,7 @@ func setupGobrew(t *testing.T, ts *httptest.Server) GoBrew {
 }
 
 func TestInstallAndExistVersion(t *testing.T) {
-	//t.Parallel()
+	t.Parallel()
 	ts := httptest.NewServer(http.FileServer(http.Dir("testdata")))
 	defer ts.Close()
 	gb := setupGobrew(t, ts)
@@ -37,7 +37,7 @@ func TestInstallAndExistVersion(t *testing.T) {
 }
 
 func TestUnInstallThenNotExistVersion(t *testing.T) {
-	//t.Parallel()
+	t.Parallel()
 	ts := httptest.NewServer(http.FileServer(http.Dir("testdata")))
 	defer ts.Close()
 	gb := setupGobrew(t, ts)
@@ -51,7 +51,7 @@ func TestUnInstallThenNotExistVersion(t *testing.T) {
 }
 
 func TestUpgrade(t *testing.T) {
-	//t.Parallel()
+	t.Parallel()
 	ts := httptest.NewServer(http.FileServer(http.Dir("testdata")))
 	defer ts.Close()
 	gb := setupGobrew(t, ts)
@@ -102,7 +102,7 @@ func TestDoNotUpgradeLatestVersion(t *testing.T) {
 }
 
 func TestInteractive(t *testing.T) {
-	//t.Parallel()
+	t.Parallel()
 	ts := httptest.NewServer(http.FileServer(http.Dir("testdata")))
 	defer ts.Close()
 	gb := setupGobrew(t, ts)
@@ -130,7 +130,7 @@ func TestInteractive(t *testing.T) {
 }
 
 func TestPrune(t *testing.T) {
-	//t.Parallel()
+	t.Parallel()
 	ts := httptest.NewServer(http.FileServer(http.Dir("testdata")))
 	defer ts.Close()
 	gb := setupGobrew(t, ts)
@@ -144,7 +144,7 @@ func TestPrune(t *testing.T) {
 }
 
 func TestGoBrew_CurrentVersion(t *testing.T) {
-	//t.Parallel()
+	t.Parallel()
 	ts := httptest.NewServer(http.FileServer(http.Dir("testdata")))
 	defer ts.Close()
 	gb := setupGobrew(t, ts)
diff --git a/helpers_test.go b/helpers_test.go
index d90507b..a26e05b 100644
--- a/helpers_test.go
+++ b/helpers_test.go
@@ -12,7 +12,7 @@ import (
 )
 
 func TestJudgeVersion(t *testing.T) {
-	//t.Parallel()
+	t.Parallel()
 	tests := []struct {
 		version     string
 		wantVersion string
@@ -56,7 +56,7 @@ func TestJudgeVersion(t *testing.T) {
 	for _, test := range tests {
 		test := test
 		t.Run(test.version, func(t *testing.T) {
-			//t.Parallel()
+			t.Parallel()
 			ts := httptest.NewServer(http.FileServer(http.Dir("testdata")))
 			defer ts.Close()
 			gb := setupGobrew(t, ts)
@@ -69,7 +69,7 @@ func TestJudgeVersion(t *testing.T) {
 }
 
 func TestListVersions(t *testing.T) {
-	//t.Parallel()
+	t.Parallel()
 	ts := httptest.NewServer(http.FileServer(http.Dir("testdata")))
 	defer ts.Close()
 	gb := setupGobrew(t, ts)
@@ -79,7 +79,7 @@ func TestListVersions(t *testing.T) {
 }
 
 func TestExistVersion(t *testing.T) {
-	//t.Parallel()
+	t.Parallel()
 	ts := httptest.NewServer(http.FileServer(http.Dir("testdata")))
 	defer ts.Close()
 	gb := setupGobrew(t, ts)
@@ -91,7 +91,7 @@ func TestExistVersion(t *testing.T) {
 }
 
 func TestExtractMajorVersion(t *testing.T) {
-	//t.Parallel()
+	t.Parallel()
 	type args struct {
 		version string
 	}
@@ -139,7 +139,7 @@ func TestExtractMajorVersion(t *testing.T) {
 	for _, tt := range tests {
 		tt := tt
 		t.Run(tt.name, func(t *testing.T) {
-			//t.Parallel()
+			t.Parallel()
 			if got := extractMajorVersion(tt.args.version); got != tt.want {
 				t.Errorf("ExtractMajorVersion() = %v, want %v", got, tt.want)
 			}
@@ -149,7 +149,7 @@ func TestExtractMajorVersion(t *testing.T) {
 }
 
 func TestGoBrew_extract(t *testing.T) {
-	//t.Parallel()
+	t.Parallel()
 	type args struct {
 		srcTar string
 		dstDir string
@@ -179,7 +179,7 @@ func TestGoBrew_extract(t *testing.T) {
 	for _, tt := range tests {
 		tt := tt
 		t.Run(tt.name, func(t *testing.T) {
-			//t.Parallel()
+			t.Parallel()
 			ts := httptest.NewServer(http.FileServer(http.Dir("testdata")))
 			defer ts.Close()
 			gb := setupGobrew(t, ts)
@@ -192,7 +192,7 @@ func TestGoBrew_extract(t *testing.T) {
 }
 
 func Test_doRequest(t *testing.T) {
-	//t.Parallel()
+	t.Parallel()
 	type args struct {
 		url string
 	}
@@ -212,7 +212,7 @@ func Test_doRequest(t *testing.T) {
 	for _, tt := range tests {
 		tt := tt
 		t.Run(tt.name, func(t *testing.T) {
-			//t.Parallel()
+			t.Parallel()
 			ts := httptest.NewServer(http.FileServer(http.Dir("testdata")))
 			defer ts.Close()
 			urlGet, _ := url.JoinPath(ts.URL, tt.args.url)
@@ -225,7 +225,7 @@ func Test_doRequest(t *testing.T) {
 }
 
 func TestGoBrew_downloadAndExtract(t *testing.T) {
-	//t.Parallel()
+	t.Parallel()
 	ts := httptest.NewServer(http.FileServer(http.Dir("testdata")))
 	defer ts.Close()
 	gb := setupGobrew(t, ts)
diff --git a/utils/utils_test.go b/utils/utils_test.go
index c2fbf36..7e28879 100644
--- a/utils/utils_test.go
+++ b/utils/utils_test.go
@@ -8,7 +8,7 @@ import (
 )
 
 func TestDownloadWithProgress(t *testing.T) {
-	//t.Parallel()
+	t.Parallel()
 	ts := httptest.NewServer(http.FileServer(http.Dir("../testdata")))
 	defer ts.Close()
 	path, _ := url.JoinPath(ts.URL, "go1.9.darwin-arm64.tar.gz")