diff --git a/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/LinkedService.json b/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/LinkedService.json
index 1d953301708b..3d5f1ee81e26 100644
--- a/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/LinkedService.json
+++ b/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/LinkedService.json
@@ -1939,6 +1939,11 @@
           "x-ms-format": "dfe-string",
           "description": "Database name for connection. Type: string."
         },
+        "authenticationType": {
+          "type": "object",
+          "x-ms-format": "dfe-string",
+          "description": "The authentication type to use. Type: string."
+        },
         "sslMode": {
           "type": "object",
           "x-ms-format": "dfe-int",
@@ -2017,7 +2022,8 @@
         "server",
         "username",
         "database",
-        "sslMode"
+        "sslMode",
+        "authenticationType"
       ]
     },
     "SybaseLinkedService": {
diff --git a/specification/datafactory/resource-manager/sdk-suppressions.yaml b/specification/datafactory/resource-manager/sdk-suppressions.yaml
index b22077464b74..cbeef851b326 100644
--- a/specification/datafactory/resource-manager/sdk-suppressions.yaml
+++ b/specification/datafactory/resource-manager/sdk-suppressions.yaml
@@ -13,3 +13,4 @@ suppressions:
     - package: "@azure/arm-datafactory"
       breaking-changes:
         - Interface HDInsightOnDemandLinkedService has a new required parameter versionTypePropertiesVersion
+        - Interface PostgreSqlV2LinkedService has a new required parameter authenticationType
diff --git a/specification/synapse/data-plane/Microsoft.Synapse/stable/2020-12-01/entityTypes/LinkedService.json b/specification/synapse/data-plane/Microsoft.Synapse/stable/2020-12-01/entityTypes/LinkedService.json
index 4eba34e78a99..b057e1e32b20 100644
--- a/specification/synapse/data-plane/Microsoft.Synapse/stable/2020-12-01/entityTypes/LinkedService.json
+++ b/specification/synapse/data-plane/Microsoft.Synapse/stable/2020-12-01/entityTypes/LinkedService.json
@@ -1680,6 +1680,10 @@
           "type": "object",
           "description": "Database name for connection. Type: string."
         },
+        "authenticationType": {
+          "type": "object",
+          "description": "The authentication type to use. Type: string."
+        },
         "sslMode": {
           "type": "object",
           "description": "SSL mode for connection. Type: integer. 0: disable, 1:allow, 2: prefer, 3: require, 4: verify-ca, 5: verify-full. Type: integer."
@@ -1745,7 +1749,8 @@
         "server",
         "username",
         "database",
-        "sslMode"
+        "sslMode",
+        "authenticationType"
       ]
     },
     "SybaseLinkedService": {