diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index ce7a874..599e8d4 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -10,7 +10,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [ 1.18.x ]
+        go-version: [ 1.21.x ]
         os: [ ubuntu-latest, macos-latest, windows-latest ]
     runs-on: ${{ matrix.os }}
 
diff --git a/go.mod b/go.mod
index 54a0156..5cc6e94 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/zentralopensource/goztl
 
-go 1.18
+go 1.21
 
 require (
 	github.com/google/go-cmp v0.6.0