diff --git a/Microsoft.Azure.Cosmos/src/CosmosClient.cs b/Microsoft.Azure.Cosmos/src/CosmosClient.cs
index a19583a181..473a2ab4d8 100644
--- a/Microsoft.Azure.Cosmos/src/CosmosClient.cs
+++ b/Microsoft.Azure.Cosmos/src/CosmosClient.cs
@@ -109,7 +109,7 @@ static CosmosClient()
 #if PREVIEW
             HttpConstants.Versions.CurrentVersion = HttpConstants.Versions.v2020_07_15;
 #else
-            HttpConstants.Versions.CurrentVersion = HttpConstants.Versions.v2018_12_31;
+            HttpConstants.Versions.CurrentVersion = HttpConstants.Versions.v2019_10_14;
 #endif
             HttpConstants.Versions.CurrentVersionUTF8 = Encoding.UTF8.GetBytes(HttpConstants.Versions.CurrentVersion);
 
diff --git a/Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.Tests/Contracts/ContractTests.cs b/Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.Tests/Contracts/ContractTests.cs
index b26e2fde9c..5221b181af 100644
--- a/Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.Tests/Contracts/ContractTests.cs
+++ b/Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.Tests/Contracts/ContractTests.cs
@@ -27,8 +27,8 @@ public void ApiVersionTest()
             Assert.AreEqual(HttpConstants.Versions.v2020_07_15, HttpConstants.Versions.CurrentVersion);
             CollectionAssert.AreEqual(Encoding.UTF8.GetBytes(HttpConstants.Versions.v2020_07_15), HttpConstants.Versions.CurrentVersionUTF8);
 #else
-            Assert.AreEqual(HttpConstants.Versions.v2018_12_31, HttpConstants.Versions.CurrentVersion);
-            CollectionAssert.AreEqual(Encoding.UTF8.GetBytes(HttpConstants.Versions.v2018_12_31), HttpConstants.Versions.CurrentVersionUTF8);
+            Assert.AreEqual(HttpConstants.Versions.v2019_10_14, HttpConstants.Versions.CurrentVersion);
+            CollectionAssert.AreEqual(Encoding.UTF8.GetBytes(HttpConstants.Versions.v2019_10_14), HttpConstants.Versions.CurrentVersionUTF8);
 #endif
         }