diff --git a/.changelog/18717.txt b/.changelog/18717.txt
new file mode 100644
index 000000000000..9a775a95f198
--- /dev/null
+++ b/.changelog/18717.txt
@@ -0,0 +1,3 @@
+```release-note:security
+build: Update to Go 1.21.3
+```
diff --git a/.go-version b/.go-version
index 3500250a4b05..bae5c7f667c9 100644
--- a/.go-version
+++ b/.go-version
@@ -1 +1 @@
-1.21.0
+1.21.3
diff --git a/contributing/README.md b/contributing/README.md
index dd43d907cc53..981516378a61 100644
--- a/contributing/README.md
+++ b/contributing/README.md
@@ -30,7 +30,7 @@ A development environment is supplied via Vagrant to make getting started easier
 
 Developing without Vagrant
 ---
-1. Install [Go 1.21.0+](https://golang.org/) *(Note: `gcc-go` is not supported)*
+1. Install [Go 1.21.3+](https://golang.org/) *(Note: `gcc-go` is not supported)*
 1. Clone this repo
    ```sh
    $ git clone https://github.com/hashicorp/nomad.git
diff --git a/scripts/linux-priv-go.sh b/scripts/linux-priv-go.sh
index ae18fd852b70..9a5f76f86d3b 100755
--- a/scripts/linux-priv-go.sh
+++ b/scripts/linux-priv-go.sh
@@ -21,7 +21,7 @@ case $(arch) in
 esac
 
 function install_go() {
-	local go_version="1.21.0"
+	local go_version="1.21.3"
 	local download="https://storage.googleapis.com/golang/go${go_version}.linux-${ARCH}.tar.gz"
 
 	if go version 2>&1 | grep -q "${go_version}"; then
diff --git a/scripts/release/mac-remote-build b/scripts/release/mac-remote-build
index f738a5dc8a4a..39177e87516e 100755
--- a/scripts/release/mac-remote-build
+++ b/scripts/release/mac-remote-build
@@ -56,7 +56,7 @@ REPO_PATH="${TMP_WORKSPACE}/gopath/src/github.com/hashicorp/nomad"
 mkdir -p "${TMP_WORKSPACE}/tmp"
 
 install_go() {
-  local go_version="1.21.0"
+  local go_version="1.21.3"
   local download=
 
   download="https://storage.googleapis.com/golang/go${go_version}.darwin-amd64.tar.gz"