diff --git a/CHANGELOG.md b/CHANGELOG.md
index f18378d4..4d5ba650 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,8 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com
 
 ## [Unreleased]
 
+- Update `shfmt@latest` to 3.9.0.
+
 - Update `zola@latest` to 0.19.2.
 
 - Update `cargo-semver-checks@latest` to 0.34.0.
diff --git a/manifests/shfmt.json b/manifests/shfmt.json
index 7edd7ddc..1752c9a5 100644
--- a/manifests/shfmt.json
+++ b/manifests/shfmt.json
@@ -19,10 +19,35 @@
   },
   "license_markdown": "[BSD-3-Clause](https://github.com/mvdan/sh/blob/master/LICENSE)",
   "latest": {
-    "version": "3.8.0"
+    "version": "3.9.0"
   },
   "3": {
-    "version": "3.8.0"
+    "version": "3.9.0"
+  },
+  "3.9": {
+    "version": "3.9.0"
+  },
+  "3.9.0": {
+    "x86_64_linux_musl": {
+      "etag": "0x8DCBE426554DD75",
+      "checksum": "d99b06506aee2ac9113daec3049922e70dc8cffb84658e3ae512c6a6cbe101b6"
+    },
+    "x86_64_macos": {
+      "etag": "0x8DCBE4264D5DC15",
+      "checksum": "3e1ac72e91ba88ce483766e57a1aa41fa502a0f9d5a47f5f5cd3663badcecee4"
+    },
+    "x86_64_windows": {
+      "etag": "0x8DCBE4263C7BEAF",
+      "checksum": "4ea136134248ac8ebbf9103370ddcd951b515a9e9bfba903252f12fd067bb5e9"
+    },
+    "aarch64_linux_musl": {
+      "etag": "0x8DCBE42651535DC",
+      "checksum": "5e511463068f3d27ae1b087fb597fb9e8ad865be2ac501964a222a834fc1c463"
+    },
+    "aarch64_macos": {
+      "etag": "0x8DCBE4265985163",
+      "checksum": "7d89694369a516b2d5a68b31f8be2da04c91f50fb7cdd8e41003081b814ba3e8"
+    }
   },
   "3.8": {
     "version": "3.8.0"