diff --git a/tools/go.mod b/tools/go.mod
index c25470c..65e8ba7 100644
--- a/tools/go.mod
+++ b/tools/go.mod
@@ -1,6 +1,7 @@
 module tools
 
-go 1.22.1
+go 1.23.0
+
 toolchain go1.23.6
 
 require (
diff --git a/utilx/defaults_test.go b/utilx/defaults_test.go
index 4e930e2..dd4820d 100644
--- a/utilx/defaults_test.go
+++ b/utilx/defaults_test.go
@@ -1,24 +1,13 @@
 package utilx
 
 import (
-	"testing"
 	"time"
 
-	"bou.ke/monkey"
 	. "gopkg.in/check.v1"
 )
 
 // Hook up gocheck into the "go test" runner.
 
-func Test(t *testing.T) {
-	monkey.Patch(time.Now, func() time.Time {
-		t, _ := time.Parse("2006-01-02 15:04:05", "2020-06-10 12:00:00")
-		return t
-	})
-
-	TestingT(t)
-}
-
 type DefaultsSuite struct{}
 
 var _ = Suite(&DefaultsSuite{})