diff --git a/redirect.go b/redirect.go
index 1994b00..fd36bcd 100644
--- a/redirect.go
+++ b/redirect.go
@@ -10,7 +10,7 @@ import (
 )
 
 const (
-	base      = "https://docs.djangoproject.com/ja/3.0/"
+	base      = "https://docs.djangoproject.com/ja/3.1/"
 	prefix    = "/en/latest/"
 	suffix    = ".html"
 	srcPrefix = "_sources/"
diff --git a/redirect_test.go b/redirect_test.go
index c92f1e0..85c389f 100644
--- a/redirect_test.go
+++ b/redirect_test.go
@@ -6,13 +6,13 @@ import (
 
 func TestMapUrlSimple(t *testing.T) {
 	m := map[string]string{
-		"":                         "https://docs.djangoproject.com/ja/3.0/",
-		"/":                        "https://docs.djangoproject.com/ja/3.0/",
-		"/favicon.ico":             "https://docs.djangoproject.com/ja/3.0/",
-		"/en/latest/faq/":          "https://docs.djangoproject.com/ja/3.0/faq/",
-		"/ja/latest/faq/":          "https://docs.djangoproject.com/ja/3.0/",
-		"/en/latest/contents.html": "https://docs.djangoproject.com/ja/3.0/contents/",
-		"/en/latest/_sources/ref/forms/fields.txt": "https://docs.djangoproject.com/ja/3.0/ref/forms/fields/",
+		"":                         "https://docs.djangoproject.com/ja/3.1/",
+		"/":                        "https://docs.djangoproject.com/ja/3.1/",
+		"/favicon.ico":             "https://docs.djangoproject.com/ja/3.1/",
+		"/en/latest/faq/":          "https://docs.djangoproject.com/ja/3.1/faq/",
+		"/ja/latest/faq/":          "https://docs.djangoproject.com/ja/3.1/",
+		"/en/latest/contents.html": "https://docs.djangoproject.com/ja/3.1/contents/",
+		"/en/latest/_sources/ref/forms/fields.txt": "https://docs.djangoproject.com/ja/3.1/ref/forms/fields/",
 	}
 
 	for k, v := range m {
@@ -24,30 +24,30 @@ func TestMapUrlSimple(t *testing.T) {
 
 func TestMapUrlMigration(t *testing.T) {
 	m := map[string]string{
-		"/en/latest/howto/apache-auth.html":                  "https://docs.djangoproject.com/ja/3.0/howto/deployment/wsgi/apache-auth/",
-		"/en/latest/howto/deployment/fastcgi.html":           "https://docs.djangoproject.com/ja/3.0/internals/deprecation/#deprecation-removed-in-1-9",
-		"/en/latest/howto/deployment/modpython.html":         "https://docs.djangoproject.com/ja/3.0/internals/deprecation/#deprecation-removed-in-1-5",
-		"/en/latest/internals/committers.html":               "https://docs.djangoproject.com/ja/3.0/internals/organization/#prerogatives",
-		"/en/latest/internals/documentation.html":            "https://docs.djangoproject.com/ja/3.0/internals/contributing/writing-documentation/",
-		"/en/latest/obsolete/":                               "https://docs.djangoproject.com/ja/3.0/internals/deprecation/",
-		"/en/latest/obsolete/admin-css.html":                 "https://docs.djangoproject.com/ja/3.0/internals/deprecation/",
-		"/en/latest/ref/authbackends.html":                   "https://docs.djangoproject.com/ja/3.0/topics/auth/customizing/#authentication-backends",
-		"/en/latest/ref/contrib/comments/":                   "https://docs.djangoproject.com/ja/3.0/releases/1.8/#features-removed-in-1-8",
-		"/en/latest/ref/contrib/comments/custom.html":        "https://docs.djangoproject.com/ja/3.0/releases/1.8/#features-removed-in-1-8",
-		"/en/latest/ref/contrib/csrf.html":                   "https://docs.djangoproject.com/ja/3.0/ref/csrf/",
-		"/en/latest/ref/contrib/databrowse.html":             "https://docs.djangoproject.com/ja/3.0/releases/1.4/#django-contrib-databrowse",
-		"/en/latest/ref/contrib/formtools/":                  "https://docs.djangoproject.com/ja/3.0/releases/1.8/#removal-of-django-contrib-formtools",
-		"/en/latest/ref/contrib/formtools/form-preview.html": "https://docs.djangoproject.com/ja/3.0/releases/1.8/#removal-of-django-contrib-formtools",
-		"/en/latest/ref/contrib/localflavor.html":            "https://docs.djangoproject.com/ja/3.0/internals/deprecation/#deprecation-removed-in-1-6",
-		"/en/latest/ref/contrib/webdesign.html":              "https://docs.djangoproject.com/ja/3.0/releases/1.8/#django-contrib-webdesign",
-		"/en/latest/ref/generic-views.html":                  "https://docs.djangoproject.com/ja/3.0/topics/class-based-views/",
-		"/en/latest/topics/generic-views-migration.html":     "https://docs.djangoproject.com/ja/3.0/topics/class-based-views/",
-		"/en/latest/topics/http/generic-views.html":          "https://docs.djangoproject.com/ja/3.0/topics/class-based-views/",
-		"/en/latest/topics/generic-views.html":               "https://docs.djangoproject.com/ja/3.0/topics/class-based-views/",
-		"/en/latest/releases/1.0-alpha-1.html":               "https://docs.djangoproject.com/ja/3.0/releases/1.0/",
-		"/en/latest/releases/1.0-alpha-2.html":               "https://docs.djangoproject.com/ja/3.0/releases/1.0/",
-		"/en/latest/releases/1.0-beta.html":                  "https://docs.djangoproject.com/ja/3.0/releases/1.0/",
-		"/en/latest/releases/1.1-alpha-1.html":               "https://docs.djangoproject.com/ja/3.0/releases/1.1/",
+		"/en/latest/howto/apache-auth.html":                  "https://docs.djangoproject.com/ja/3.1/howto/deployment/wsgi/apache-auth/",
+		"/en/latest/howto/deployment/fastcgi.html":           "https://docs.djangoproject.com/ja/3.1/internals/deprecation/#deprecation-removed-in-1-9",
+		"/en/latest/howto/deployment/modpython.html":         "https://docs.djangoproject.com/ja/3.1/internals/deprecation/#deprecation-removed-in-1-5",
+		"/en/latest/internals/committers.html":               "https://docs.djangoproject.com/ja/3.1/internals/organization/#prerogatives",
+		"/en/latest/internals/documentation.html":            "https://docs.djangoproject.com/ja/3.1/internals/contributing/writing-documentation/",
+		"/en/latest/obsolete/":                               "https://docs.djangoproject.com/ja/3.1/internals/deprecation/",
+		"/en/latest/obsolete/admin-css.html":                 "https://docs.djangoproject.com/ja/3.1/internals/deprecation/",
+		"/en/latest/ref/authbackends.html":                   "https://docs.djangoproject.com/ja/3.1/topics/auth/customizing/#authentication-backends",
+		"/en/latest/ref/contrib/comments/":                   "https://docs.djangoproject.com/ja/3.1/releases/1.8/#features-removed-in-1-8",
+		"/en/latest/ref/contrib/comments/custom.html":        "https://docs.djangoproject.com/ja/3.1/releases/1.8/#features-removed-in-1-8",
+		"/en/latest/ref/contrib/csrf.html":                   "https://docs.djangoproject.com/ja/3.1/ref/csrf/",
+		"/en/latest/ref/contrib/databrowse.html":             "https://docs.djangoproject.com/ja/3.1/releases/1.4/#django-contrib-databrowse",
+		"/en/latest/ref/contrib/formtools/":                  "https://docs.djangoproject.com/ja/3.1/releases/1.8/#removal-of-django-contrib-formtools",
+		"/en/latest/ref/contrib/formtools/form-preview.html": "https://docs.djangoproject.com/ja/3.1/releases/1.8/#removal-of-django-contrib-formtools",
+		"/en/latest/ref/contrib/localflavor.html":            "https://docs.djangoproject.com/ja/3.1/internals/deprecation/#deprecation-removed-in-1-6",
+		"/en/latest/ref/contrib/webdesign.html":              "https://docs.djangoproject.com/ja/3.1/releases/1.8/#django-contrib-webdesign",
+		"/en/latest/ref/generic-views.html":                  "https://docs.djangoproject.com/ja/3.1/topics/class-based-views/",
+		"/en/latest/topics/generic-views-migration.html":     "https://docs.djangoproject.com/ja/3.1/topics/class-based-views/",
+		"/en/latest/topics/http/generic-views.html":          "https://docs.djangoproject.com/ja/3.1/topics/class-based-views/",
+		"/en/latest/topics/generic-views.html":               "https://docs.djangoproject.com/ja/3.1/topics/class-based-views/",
+		"/en/latest/releases/1.0-alpha-1.html":               "https://docs.djangoproject.com/ja/3.1/releases/1.0/",
+		"/en/latest/releases/1.0-alpha-2.html":               "https://docs.djangoproject.com/ja/3.1/releases/1.0/",
+		"/en/latest/releases/1.0-beta.html":                  "https://docs.djangoproject.com/ja/3.1/releases/1.0/",
+		"/en/latest/releases/1.1-alpha-1.html":               "https://docs.djangoproject.com/ja/3.1/releases/1.1/",
 	}
 
 	for k, v := range m {