diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 7b0af73..47092cf 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -18,7 +18,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v2
       with:
-        go-version: 1.19.3
+        go-version: 1.21.6
 
     - name: Build
       run: make
diff --git a/go.mod b/go.mod
index 4dcbbf7..01c0ff4 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/evolbioinfo/gotree
 
-go 1.19
+go 1.21.6
 
 require (
 	github.com/ajstarks/svgo v0.0.0-20211024235047-1546f124cd8b