diff --git a/dotnet-v5.0.209.1-SDK/src/runtime.7211aa01b34bb55ca67bdddd6e80ce23ee201bd2/src/libraries/pkg/Microsoft.NETCore.Platforms/runtime.compatibility.json b/dotnet-v5.0.209.1-SDK-diff/src/runtime.7211aa01b34bb55ca67bdddd6e80ce23ee201bd2/src/libraries/pkg/Microsoft.NETCore.Platforms/runtime.compatibility.json
index 844590f..35d11f8 100644
--- a/src/libraries/pkg/Microsoft.NETCore.Platforms/runtime.compatibility.json
+++ b/src/libraries/pkg/Microsoft.NETCore.Platforms/runtime.compatibility.json
@@ -4808,6 +4808,97 @@
     "any",
     "base"
   ],
+  "rosa": [
+    "rosa",
+    "linux",
+    "unix",
+    "any",
+    "base"
+  ],
+  "rosa-arm64": [
+    "rosa-arm64",
+    "rosa",
+    "linux-arm64",
+    "linux",
+    "unix-arm64",
+    "unix",
+    "any",
+    "base"
+  ],
+  "rosa-x64": [
+    "rosa-x64",
+    "rosa",
+    "linux-x64",
+    "linux",
+    "unix-x64",
+    "unix",
+    "any",
+    "base"
+  ],
+  "rosa.2019.05": [
+    "rosa.2019.05",
+    "rosa",
+    "linux",
+    "unix",
+    "any",
+    "base"
+  ],
+  "rosa.2019.05-arm64": [
+    "rosa.2019.05-arm64",
+    "rosa.2019.05",
+    "rosa-arm64",
+    "rosa",
+    "linux-arm64",
+    "linux",
+    "unix-arm64",
+    "unix",
+    "any",
+    "base"
+  ],
+  "rosa.2019.05-x64": [
+    "rosa.2019.05-x64",
+    "rosa.2019.05",
+    "rosa-x64",
+    "rosa",
+    "linux-x64",
+    "linux",
+    "unix-x64",
+    "unix",
+    "any",
+    "base"
+  ],
+  "rosa.2021.1": [
+    "rosa.2021.1",
+    "rosa",
+    "linux",
+    "unix",
+    "any",
+    "base"
+  ],
+  "rosa.2021.1-arm64": [
+    "rosa.2021.1-arm64",
+    "rosa.2021.1",
+    "rosa-arm64",
+    "rosa",
+    "linux-arm64",
+    "linux",
+    "unix-arm64",
+    "unix",
+    "any",
+    "base"
+  ],
+  "rosa.2021.1-x64": [
+    "rosa.2021.1-x64",
+    "rosa.2021.1",
+    "rosa-x64",
+    "rosa",
+    "linux-x64",
+    "linux",
+    "unix-x64",
+    "unix",
+    "any",
+    "base"
+  ],
   "sles": [
     "sles",
     "linux",
@@ -7239,4 +7330,4 @@
     "any",
     "base"
   ]
-}
\ No newline at end of file
+}
diff --git a/dotnet-v5.0.209.1-SDK/src/runtime.7211aa01b34bb55ca67bdddd6e80ce23ee201bd2/src/libraries/pkg/Microsoft.NETCore.Platforms/runtime.json b/dotnet-v5.0.209.1-SDK-diff/src/runtime.7211aa01b34bb55ca67bdddd6e80ce23ee201bd2/src/libraries/pkg/Microsoft.NETCore.Platforms/runtime.json
index 7d6aa10..9c56b1b 100644
--- a/src/libraries/pkg/Microsoft.NETCore.Platforms/runtime.json
+++ b/src/libraries/pkg/Microsoft.NETCore.Platforms/runtime.json
@@ -2030,6 +2030,57 @@
         "rhel-x64"
       ]
     },
+    "rosa": {
+      "#import": [
+        "linux"
+      ]
+    },
+    "rosa-arm64": {
+      "#import": [
+        "rosa",
+        "linux-arm64"
+      ]
+    },
+    "rosa-x64": {
+      "#import": [
+        "rosa",
+        "linux-x64"
+      ]
+    },
+    "rosa.2019.05": {
+      "#import": [
+        "rosa"
+      ]
+    },
+    "rosa.2019.05-arm64": {
+      "#import": [
+        "rosa.2019.05",
+        "rosa-arm64"
+      ]
+    },
+    "rosa.2019.05-x64": {
+      "#import": [
+        "rosa.2019.05",
+        "rosa-x64"
+      ]
+    },
+    "rosa.2021.1": {
+      "#import": [
+        "rosa"
+      ]
+    },
+    "rosa.2021.1-arm64": {
+      "#import": [
+        "rosa.2021.1",
+        "rosa-arm64"
+      ]
+    },
+    "rosa.2021.1-x64": {
+      "#import": [
+        "rosa.2021.1",
+        "rosa-x64"
+      ]
+    },
     "sles": {
       "#import": [
         "linux"
@@ -3196,4 +3247,4 @@
       ]
     }
   }
-}
\ No newline at end of file
+}
diff --git a/dotnet-v5.0.209.1-SDK/src/runtime.7211aa01b34bb55ca67bdddd6e80ce23ee201bd2/src/libraries/pkg/Microsoft.NETCore.Platforms/runtimeGroups.props b/dotnet-v5.0.209.1-SDK-diff/src/runtime.7211aa01b34bb55ca67bdddd6e80ce23ee201bd2/src/libraries/pkg/Microsoft.NETCore.Platforms/runtimeGroups.props
index 3cb3d2d..9bc7f0d 100644
--- a/src/libraries/pkg/Microsoft.NETCore.Platforms/runtimeGroups.props
+++ b/src/libraries/pkg/Microsoft.NETCore.Platforms/runtimeGroups.props
@@ -187,6 +187,13 @@
       <Versions>9</Versions>
     </RuntimeGroup>
 
+    <RuntimeGroup Include="rosa">
+      <Parent>linux</Parent>
+      <Architectures>x64;arm64</Architectures>
+      <Versions>2021.1;2019.05</Versions>
+      <TreatVersionsAsCompatible>false</TreatVersionsAsCompatible>
+    </RuntimeGroup>
+
     <RuntimeGroup Include="sles">
       <Parent>linux</Parent>
       <Architectures>x64</Architectures>