diff --git a/Dockerfile b/Dockerfile
index f116219..3f05366 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.20
+FROM golang:1.21
 
 RUN apt-get update \
  && apt-get install -y libaio1 unzip
diff --git a/go.mod b/go.mod
index 993c8de..4f929db 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/sue445/plant_erd
 
-go 1.20
+go 1.21
 
 require (
 	github.com/deckarep/golang-set v1.8.0