diff --git a/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/ManagedEnvironments.json b/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/ManagedEnvironments.json
index 9ae49cd42d0f..232f057b1778 100644
--- a/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/ManagedEnvironments.json
+++ b/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/ManagedEnvironments.json
@@ -523,6 +523,68 @@
             "$ref": "./examples/Certificate_Delete.json"
           }
         }
+      },
+      "patch": {
+        "tags": [
+          "ManagedEnvironments",
+          "Certificates"
+        ],
+        "summary": "Update properties of a certificate",
+        "description": "Patches a certificate. Currently only patching of tags is supported",
+        "operationId": "Certificates_Update",
+        "parameters": [
+          {
+            "$ref": "../../../../../common-types/resource-management/v3/types.json#/parameters/SubscriptionIdParameter"
+          },
+          {
+            "$ref": "../../../../../common-types/resource-management/v3/types.json#/parameters/ResourceGroupNameParameter"
+          },
+          {
+            "name": "managedEnvironmentName",
+            "in": "path",
+            "description": "Name of the Managed Environment.",
+            "required": true,
+            "type": "string"
+          },
+          {
+            "name": "name",
+            "in": "path",
+            "description": "Name of the Certificate.",
+            "required": true,
+            "type": "string"
+          },
+          {
+            "name": "certificateEnvelope",
+            "in": "body",
+            "required": true,
+            "description": "Properties of a certificate that need to be updated",
+            "schema": {
+              "$ref": "#/definitions/CertificatePatch"
+            }
+          },
+          {
+            "$ref": "../../../../../common-types/resource-management/v3/types.json#/parameters/ApiVersionParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Container App updated successfully.",
+            "schema": {
+              "$ref": "#/definitions/Certificate"
+            }
+          },
+          "default": {
+            "description": "Common error response.",
+            "schema": {
+              "$ref": "./CommonDefinitions.json#/definitions/DefaultErrorResponse"
+            }
+          }
+        },
+        "x-ms-examples": {
+          "Patch Certificate": {
+            "$ref": "./examples/Certificates_Patch.json"
+          }
+        }
       }
     }
   },
@@ -723,7 +785,7 @@
       "type": "object",
       "allOf": [
         {
-          "$ref": "../../../../../common-types/resource-management/v3/types.json#/definitions/ProxyResource"
+          "$ref": "../../../../../common-types/resource-management/v3/types.json#/definitions/TrackedResource"
         }
       ],
       "properties": {
@@ -810,6 +872,19 @@
           "readOnly": true
         }
       }
+    },
+    "CertificatePatch": {
+      "description": "A certificate to update",
+      "type": "object",
+      "properties": {
+        "tags": {
+          "type": "object",
+          "additionalProperties": {
+            "type": "string"
+          },
+          "description": "Application-specific metadata in the form of key-value pairs."
+        }
+      }
     }
   },
   "securityDefinitions": {
diff --git a/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/examples/Certificate_CreateOrUpdate.json b/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/examples/Certificate_CreateOrUpdate.json
index f669ee87525e..7f2020bbde18 100644
--- a/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/examples/Certificate_CreateOrUpdate.json
+++ b/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/examples/Certificate_CreateOrUpdate.json
@@ -6,6 +6,7 @@
     "name": "certificate-firendly-name",
     "api-version": "2022-01-01-preview",
     "certificateEnvelope": {
+      "location": "East US",
       "properties": {
         "password": "private key password",
         "value": "PFX-or-PEM-blob"
@@ -18,6 +19,7 @@
       "body": {
         "id": "/subscriptions/34adfa4f-cedf-4dc0-ba29-b6d1a69ab345/resourceGroups/examplerg/providers/Microsoft.App/managedEnvironments/testcontainerenv/certificate-firendly-name",
         "type": "Microsoft.App/ManagedEnvironments/Certificates",
+        "location": "East US",
         "properties": {
           "subjectName": "my-subject-name.company.country.net",
           "issuer": "Issuer Name",
diff --git a/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/examples/Certificate_Get.json b/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/examples/Certificate_Get.json
index e6381853fc15..bdb732bd2d6c 100644
--- a/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/examples/Certificate_Get.json
+++ b/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/examples/Certificate_Get.json
@@ -13,6 +13,7 @@
         "id": "/subscriptions/34adfa4f-cedf-4dc0-ba29-b6d1a69ab345/resourceGroups/examplerg/providers/Microsoft.App/managedEnvironments/testcontainerenv/certificate-firendly-name",
         "name": "certificate-firendly-name",
         "type": "Microsoft.App/ManagedEnvironments/Certificates",
+        "location": "East US",
         "properties": {
           "subjectName": "my-subject-name.company.country.net",
           "issuer": "Issuer Name",
diff --git a/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/examples/Certificates_ListByManagedEnvironment.json b/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/examples/Certificates_ListByManagedEnvironment.json
index 8a1322098018..b2c49403e21c 100644
--- a/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/examples/Certificates_ListByManagedEnvironment.json
+++ b/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/examples/Certificates_ListByManagedEnvironment.json
@@ -14,6 +14,7 @@
             "id": "/subscriptions/34adfa4f-cedf-4dc0-ba29-b6d1a69ab345/resourceGroups/examplerg/providers/Microsoft.App/managedEnvironments/testcontainerenv/certificate-firendly-name",
             "name": "certificate-firendly-name",
             "type": "Microsoft.App/ManagedEnvironments/Certificates",
+            "location": "East US",
             "properties": {
               "subjectName": "my-subject-name.company.country.net",
               "issuer": "Issuer Name",
@@ -27,6 +28,7 @@
             "id": "/subscriptions/34adfa4f-cedf-4dc0-ba29-b6d1a69ab345/resourceGroups/examplerg/providers/Microsoft.App/managedEnvironments/testcontainerenv/certificate-firendly-name",
             "name": "certificate-firendly-name",
             "type": "Microsoft.App/ManagedEnvironments/Certificates",
+            "location": "East US",
             "properties": {
               "subjectName": "my-subject-name.company.country.net",
               "issuer": "Issuer Name",
diff --git a/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/examples/Certificates_Patch.json b/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/examples/Certificates_Patch.json
new file mode 100644
index 000000000000..756e5d4fdc86
--- /dev/null
+++ b/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/examples/Certificates_Patch.json
@@ -0,0 +1,39 @@
+{
+  "parameters": {
+    "subscriptionId": "34adfa4f-cedf-4dc0-ba29-b6d1a69ab345",
+    "resourceGroupName": "examplerg",
+    "managedEnvironmentName": "testcontainerenv",
+    "name": "certificate-firendly-name",
+    "api-version": "2022-01-01-preview",
+    "certificateEnvelope": {
+      "containerAppEnvelope": {
+        "tags": {
+          "tag1": "value1",
+          "tag2": "value2"
+        }
+      }
+    }
+  },
+  "responses": {
+    "200": {
+      "headers": {},
+      "body": {
+        "id": "/subscriptions/34adfa4f-cedf-4dc0-ba29-b6d1a69ab345/resourceGroups/examplerg/providers/Microsoft.App/managedEnvironments/testcontainerenv/certificate-firendly-name",
+        "type": "Microsoft.App/ManagedEnvironments/Certificates",
+        "location": "East US",
+        "tags": {
+          "tag1": "value1",
+          "tag2": "value2"
+        },
+        "properties": {
+          "subjectName": "my-subject-name.company.country.net",
+          "issuer": "Issuer Name",
+          "issueDate": "2021-11-06T04:00:00Z",
+          "expirationDate": "2022-11-06T04:00:00Z",
+          "thumbprint": "CERTIFICATE_THUMBPRINT",
+          "valid": true
+        }
+      }
+    }
+  }
+}