diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8dc73f49..2beaa9f7 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 `just@latest` to 1.40.0.
+
 - Update `mdbook@latest` to 0.4.47.
 
 ## [2.49.17] - 2025-03-09
diff --git a/manifests/just.json b/manifests/just.json
index 7baed0a5..76787ab7 100644
--- a/manifests/just.json
+++ b/manifests/just.json
@@ -22,10 +22,39 @@
   },
   "license_markdown": "[CC0-1.0](https://github.com/casey/just/blob/master/LICENSE)",
   "latest": {
-    "version": "1.39.0"
+    "version": "1.40.0"
   },
   "1": {
-    "version": "1.39.0"
+    "version": "1.40.0"
+  },
+  "1.40": {
+    "version": "1.40.0"
+  },
+  "1.40.0": {
+    "x86_64_linux_musl": {
+      "etag": "0x8DD5F4C0A47C652",
+      "checksum": "181b91d0ceebe8a57723fb648ed2ce1a44d849438ce2e658339df4f8db5f1263"
+    },
+    "x86_64_macos": {
+      "etag": "0x8DD5F4BFBEA441F",
+      "checksum": "83e6b5380dc08f2d839f358327c9bb93184edf451955111ba6222be59ed1f172"
+    },
+    "x86_64_windows": {
+      "etag": "0x8DD5F4C34EB78DC",
+      "checksum": "50d7c9b3ef3e38169bb62020cf8b091ac55e989c862fb0dde8af5a9b2505526a"
+    },
+    "aarch64_linux_musl": {
+      "etag": "0x8DD5F4C0BBB8561",
+      "checksum": "d065d0df1a1f99529869fba8a5b3e0a25c1795b9007099b00dfabe29c7c1f7b6"
+    },
+    "aarch64_macos": {
+      "etag": "0x8DD5F4C00F48420",
+      "checksum": "0fb2401a46409bdf574f42f92df0418934166032ec2bcb0fc7919b7664fdcc01"
+    },
+    "aarch64_windows": {
+      "etag": "0x8DD5F4C5BDABC42",
+      "checksum": "e15ed58a72bab17761302d523f2798adaa1e88c0402037aa9eec56794646d4aa"
+    }
   },
   "1.39": {
     "version": "1.39.0"