diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 1342b65..3ce1e8d 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -10,7 +10,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macOS-latest, windows-latest]
-        go: ['1.21.x', '1.23.x']
+        go: ['1.22.x', '1.23.x']
 
     steps:
 
diff --git a/go.mod b/go.mod
index 74abf8b..80ffabf 100644
--- a/go.mod
+++ b/go.mod
@@ -1,9 +1,9 @@
 module github.com/issue9/source
 
-go 1.21
+go 1.22.0
 
 require (
 	github.com/issue9/assert/v4 v4.3.0
 	github.com/issue9/errwrap v0.3.2
-	golang.org/x/mod v0.20.0
+	golang.org/x/mod v0.21.0
 )
diff --git a/go.sum b/go.sum
index 7371652..03f39ef 100644
--- a/go.sum
+++ b/go.sum
@@ -2,5 +2,5 @@ github.com/issue9/assert/v4 v4.3.0 h1:W3XDKmttsfzihYGxJ9rJoL2ViJgWERB9IxfHcxjv65
 github.com/issue9/assert/v4 v4.3.0/go.mod h1:v7qDRXi7AsaZZNh8eAK2rkLJg5/clztqQGA1DRv9Lv4=
 github.com/issue9/errwrap v0.3.2 h1:7KEme9Pfe75M+sIMcPCn/DV90wjnOcRbO4DXVAHj3Fw=
 github.com/issue9/errwrap v0.3.2/go.mod h1:KcCLuUGiffjooLCUjL89r1cyO8/HT/VRcQrneO53N3A=
-golang.org/x/mod v0.20.0 h1:utOm6MM3R3dnawAiJgn0y+xvuYRsm1RKM/4giyfDgV0=
-golang.org/x/mod v0.20.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
+golang.org/x/mod v0.21.0 h1:vvrHzRwRfVKSiLrG+d4FMl/Qi4ukBCE6kZlTUkDYRT0=
+golang.org/x/mod v0.21.0/go.mod h1:6SkKJ3Xj0I0BrPOZoBy3bdMptDDU9oJrpohJ3eWZ1fY=