diff --git a/bucket/mono.json b/bucket/mono.json
index ae91c66d9e..0fd9ce839b 100644
--- a/bucket/mono.json
+++ b/bucket/mono.json
@@ -1,16 +1,16 @@
 {
-    "version": "6.4.0.198",
+    "version": "6.6.0.161",
     "description": "Cross platform, open source .NET framework.",
     "homepage": "https://www.mono-project.com/",
     "license": "MIT",
     "architecture": {
         "64bit": {
-            "url": "https://download.mono-project.com/archive/6.4.0/windows-installer/mono-6.4.0.198-x64-0.msi",
-            "hash": "4f135b672017ea861539320cdba124768364fd653d7736d3498dc77cc249abe1"
+            "url": "https://download.mono-project.com/archive/6.6.0/windows-installer/mono-6.6.0.161-x64-0.msi",
+            "hash": "8d3392ed19977c0b869aaf594fd9c12114d8bcb6185bca27d8329ff5f974d23e"
         },
         "32bit": {
-            "url": "https://download.mono-project.com/archive/6.4.0/windows-installer/mono-6.4.0.198-gtksharp-2.12.45-win32-0.msi",
-            "hash": "8957ca62bed562dc12d1e03baf2691901a73907459f54871789de2943225aaa1"
+            "url": "https://download.mono-project.com/archive/6.6.0/windows-installer/mono-6.6.0.161-gtksharp-2.12.45-win32-0.msi",
+            "hash": "e33e52c0946e6f848976886d95be55b1f811aa2b491ff19a6f18dae94c133fa1"
         }
     },
     "extract_dir": "Mono",