diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 774f8d2..dd2b0d4 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -25,8 +25,6 @@ jobs:
 
       matrix:
         golang:
-          - "1.19"
-          - "1.20"
           - "1.21"
           - "1.22"
           - "1.23"
diff --git a/go.mod b/go.mod
index e41f3b0..9dd53a2 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/sue445/gcp-secretmanagerenv
 
-go 1.19
+go 1.21
 
 require (
 	cloud.google.com/go/secretmanager v1.13.6