diff --git a/.circleci/config.yml b/.circleci/config.yml
index e426c83..90483a3 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -4,7 +4,7 @@ version: 2.1
 executors:
   go-build:
     docker:
-      - image: us-docker.pkg.dev/pantheon-artifacts/internal/go-build:1.20
+      - image: us-docker.pkg.dev/pantheon-artifacts/internal/go-build:1.21
         auth:
           username: _json_key
           password: $CIRCLE_CI_COMMON_KEY
diff --git a/go.mod b/go.mod
index 25a7503..890816e 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module sites-yml-validator
 
-go 1.20
+go 1.21
 
 require (
 	github.com/spf13/cobra v1.8.0