diff --git a/Tests/SparkConnectTests/CaseInsensitiveDictionaryTests.swift b/Tests/SparkConnectTests/CaseInsensitiveDictionaryTests.swift
index 481dcc3..a2e51f3 100644
--- a/Tests/SparkConnectTests/CaseInsensitiveDictionaryTests.swift
+++ b/Tests/SparkConnectTests/CaseInsensitiveDictionaryTests.swift
@@ -23,6 +23,7 @@ import Testing
 @testable import SparkConnect
 
 /// A test suite for `CaseInsensitiveDictionary`
+@Suite(.serialized)
 struct CaseInsensitiveDictionaryTests {
   @Test
   func empty() async throws {
diff --git a/Tests/SparkConnectTests/CatalogTests.swift b/Tests/SparkConnectTests/CatalogTests.swift
index 5739399..053daf9 100644
--- a/Tests/SparkConnectTests/CatalogTests.swift
+++ b/Tests/SparkConnectTests/CatalogTests.swift
@@ -23,6 +23,7 @@ import Testing
 @testable import SparkConnect
 
 /// A test suite for `Catalog`
+@Suite(.serialized)
 struct CatalogTests {
 #if !os(Linux)
   @Test
diff --git a/Tests/SparkConnectTests/DataFrameInternalTests.swift b/Tests/SparkConnectTests/DataFrameInternalTests.swift
index d557400..96e8fc2 100644
--- a/Tests/SparkConnectTests/DataFrameInternalTests.swift
+++ b/Tests/SparkConnectTests/DataFrameInternalTests.swift
@@ -22,6 +22,7 @@ import Testing
 @testable import SparkConnect
 
 /// A test suite for `DataFrame` internal APIs
+@Suite(.serialized)
 struct DataFrameInternalTests {
 
 #if !os(Linux)
diff --git a/Tests/SparkConnectTests/DataFrameReaderTests.swift b/Tests/SparkConnectTests/DataFrameReaderTests.swift
index b4c7599..3c63116 100644
--- a/Tests/SparkConnectTests/DataFrameReaderTests.swift
+++ b/Tests/SparkConnectTests/DataFrameReaderTests.swift
@@ -23,6 +23,7 @@ import Testing
 import SparkConnect
 
 /// A test suite for `DataFrameReader`
+@Suite(.serialized)
 struct DataFrameReaderTests {
 
   @Test
diff --git a/Tests/SparkConnectTests/DataFrameTests.swift b/Tests/SparkConnectTests/DataFrameTests.swift
index 1d5a785..693f371 100644
--- a/Tests/SparkConnectTests/DataFrameTests.swift
+++ b/Tests/SparkConnectTests/DataFrameTests.swift
@@ -23,6 +23,7 @@ import Testing
 import SparkConnect
 
 /// A test suite for `DataFrame`
+@Suite(.serialized)
 struct DataFrameTests {
   let DEALER_TABLE =
     """
diff --git a/Tests/SparkConnectTests/DataFrameWriterTests.swift b/Tests/SparkConnectTests/DataFrameWriterTests.swift
index 464e288..3ad1234 100644
--- a/Tests/SparkConnectTests/DataFrameWriterTests.swift
+++ b/Tests/SparkConnectTests/DataFrameWriterTests.swift
@@ -23,6 +23,7 @@ import Testing
 import SparkConnect
 
 /// A test suite for `DataFrameWriter`
+@Suite(.serialized)
 struct DataFrameWriterTests {
 
   @Test
diff --git a/Tests/SparkConnectTests/DataFrameWriterV2Tests.swift b/Tests/SparkConnectTests/DataFrameWriterV2Tests.swift
index e6e7aa1..ab3252f 100644
--- a/Tests/SparkConnectTests/DataFrameWriterV2Tests.swift
+++ b/Tests/SparkConnectTests/DataFrameWriterV2Tests.swift
@@ -22,6 +22,7 @@ import SparkConnect
 import Testing
 
 /// A test suite for `DataFrameWriterV2`
+@Suite(.serialized)
 struct DataFrameWriterV2Tests {
 
   @Test
diff --git a/Tests/SparkConnectTests/RowTests.swift b/Tests/SparkConnectTests/RowTests.swift
index 3262686..8472b94 100644
--- a/Tests/SparkConnectTests/RowTests.swift
+++ b/Tests/SparkConnectTests/RowTests.swift
@@ -22,6 +22,7 @@ import SparkConnect
 import Testing
 
 /// A test suite for `Row`
+@Suite(.serialized)
 struct RowTests {
   @Test
   func empty() {
diff --git a/Tests/SparkConnectTests/SQLTests.swift b/Tests/SparkConnectTests/SQLTests.swift
index b81e94a..a9c6b71 100644
--- a/Tests/SparkConnectTests/SQLTests.swift
+++ b/Tests/SparkConnectTests/SQLTests.swift
@@ -23,6 +23,7 @@ import Testing
 @testable import SparkConnect
 
 /// A test suite for various SQL statements.
+@Suite(.serialized)
 struct SQLTests {
   let fm = FileManager.default
   let path = Bundle.module.path(forResource: "queries", ofType: "")!
diff --git a/Tests/SparkConnectTests/SparkFileUtilsTests.swift b/Tests/SparkConnectTests/SparkFileUtilsTests.swift
index 642b6ee..a003c64 100644
--- a/Tests/SparkConnectTests/SparkFileUtilsTests.swift
+++ b/Tests/SparkConnectTests/SparkFileUtilsTests.swift
@@ -23,6 +23,7 @@ import Testing
 @testable import SparkConnect
 
 /// A test suite for `SparkFileUtils`
+@Suite(.serialized)
 struct SparkFileUtilsTests {
   let fm = FileManager.default
 
diff --git a/Tests/SparkConnectTests/SparkSessionTests.swift b/Tests/SparkConnectTests/SparkSessionTests.swift
index e57e3df..9097e99 100644
--- a/Tests/SparkConnectTests/SparkSessionTests.swift
+++ b/Tests/SparkConnectTests/SparkSessionTests.swift
@@ -23,6 +23,7 @@ import Testing
 @testable import SparkConnect
 
 /// A test suite for `SparkSession`
+@Suite(.serialized)
 struct SparkSessionTests {
   @Test
   func sparkContext() async throws {