diff --git a/images/macos/toolsets/toolset-10.15.json b/images/macos/toolsets/toolset-10.15.json
index eb742fb88..c321a4aa5 100644
--- a/images/macos/toolsets/toolset-10.15.json
+++ b/images/macos/toolsets/toolset-10.15.json
@@ -20,7 +20,7 @@
     "xamarin": {
         "vsmac": "latest",
         "mono-versions": [
-            "6.12.0.140", "6.10.0.106", "6.8.0.123", "6.6.0.166", "6.4.0.208"
+            "6.12.0.125", "6.10.0.106", "6.8.0.123", "6.6.0.166", "6.4.0.208"
         ],
         "ios-versions": [
             "14.14.2.5", "14.10.0.4", "14.8.0.3", "14.6.0.15", "14.4.1.3", "14.2.0.12", "14.0.0.0", "13.20.2.2", "13.18.2.1", "13.16.0.13", "13.14.1.39", "13.10.0.21", "13.8.3.0", "13.6.0.12", "13.4.0.2", "13.2.0.47"
diff --git a/images/macos/toolsets/toolset-11.json b/images/macos/toolsets/toolset-11.json
index b0b4c04e3..3cd7ba5a5 100644
--- a/images/macos/toolsets/toolset-11.json
+++ b/images/macos/toolsets/toolset-11.json
@@ -13,7 +13,7 @@
     "xamarin": {
         "vsmac": "latest",
         "mono-versions": [
-            "6.12.0.140"
+            "6.12.0.125"
         ],
         "ios-versions": [
             "14.20.0.1", "14.16.0.5", "14.14.2.5", "14.10.0.4", "14.8.0.3", "14.6.0.15", "14.4.1.3", "14.2.0.12", "14.0.0.0", "13.20.2.2"