diff --git a/bucket/rtools.json b/bucket/rtools.json
index 128987a9a9..a06849263f 100644
--- a/bucket/rtools.json
+++ b/bucket/rtools.json
@@ -1,5 +1,5 @@
 {
-    "version": "4.5.6608.6492",
+    "version": "4.5.6691.6492",
     "description": "Tools for building packages for R under Microsoft Windows, or for building R itself.",
     "homepage": "https://cloud.r-project.org/bin/windows/Rtools",
     "license": "BSD-3-Clause",
@@ -12,12 +12,12 @@
     ],
     "architecture": {
         "64bit": {
-            "url": "https://cloud.r-project.org/bin/windows/Rtools/rtools45/files/rtools45-6608-6492.exe",
-            "hash": "5407bcc3406a1d602423b68d5e7b7110a2a5f363627b6159d5e17a3392904d6c"
+            "url": "https://cloud.r-project.org/bin/windows/Rtools/rtools45/files/rtools45-6691-6492.exe",
+            "hash": "9e027aa86171e48fdf6963c3975890820ac1b7421ed11478260608fd1f6cbee8"
         },
         "arm64": {
-            "url": "https://cloud.r-project.org/bin/windows/Rtools/rtools45/files/rtools45-aarch64-6608-6492.exe",
-            "hash": "9612f8e80192e9ac4cb0177e2e481917ffd46da9fea218ebbc3422fcc7afd015"
+            "url": "https://cloud.r-project.org/bin/windows/Rtools/rtools45/files/rtools45-aarch64-6691-6492.exe",
+            "hash": "815dd903ef3b81cbb0772684e08c74cc332c89cbe67518cf22f593c4a195b27e"
         }
     },
     "innosetup": true,