diff --git a/CHANGELOG.md b/CHANGELOG.md
index cb1301fd..6144de9c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,8 @@
 # Go Buildpack Changelog
 
 ## Unreleased
+* Add go1.21.1
+* go1.21 defaults to go1.21.1
 
 ## v178 (2023-08-14)
 * Add go1.21.0
diff --git a/data.json b/data.json
index ee612469..8ce97323 100644
--- a/data.json
+++ b/data.json
@@ -2,7 +2,7 @@
   "Go": {
     "DefaultVersion": "go1.12.17",
     "VersionExpansion": {
-      "go1.21": "go1.21.0",
+      "go1.21": "go1.21.1",
       "go1.20.0": "go1.20",
       "go1.20": "go1.20.7",
       "go1.19.0": "go1.19",
@@ -132,7 +132,7 @@
       "go1.18.10.linux-amd64.tar.gz",
       "go1.19.12.linux-amd64.tar.gz",
       "go1.20.7.linux-amd64.tar.gz",
-      "go1.21.0.linux-amd64.tar.gz",
+      "go1.21.1.linux-amd64.tar.gz",
       "go1.4.3.linux-amd64.tar.gz",
       "go1.6.4.linux-amd64.tar.gz",
       "go1.7.6.linux-amd64.tar.gz",
diff --git a/files.json b/files.json
index 28f6b40f..3164f7c1 100644
--- a/files.json
+++ b/files.json
@@ -779,6 +779,10 @@
     "SHA": "d0398903a16ba2232b389fb31032ddf57cac34efda306a0eebac34f0965a0742",
     "URL": "https://dl.google.com/go/go1.21.0.linux-amd64.tar.gz"
   },
+  "go1.21.1.linux-amd64.tar.gz": {
+    "SHA": "b3075ae1ce5dab85f89bc7905d1632de23ca196bd8336afd93fa97434cfa55ae",
+    "URL": "https://dl.google.com/go/go1.21.1.linux-amd64.tar.gz"
+  },
   "go1.3.1.linux-amd64.tar.gz": {
     "SHA": "3af011cc19b21c7180f2604fd85fbc4ddde97143",
     "URL": "https://storage.googleapis.com/golang/go1.3.1.linux-amd64.tar.gz"