diff --git a/dat/generated_tables.py b/dat/generated_tables.py
index 4cd6e63b..43f9014b 100644
--- a/dat/generated_tables.py
+++ b/dat/generated_tables.py
@@ -570,4 +570,5 @@ def create_iceberg_compat_v1(case: TestCaseInfo, spark: SparkSession):
         .execute()
     )
     delta_table.upgradeTableProtocol(3, 7)
+    delta_table.addFeatureSupport("columnMapping")
     df.repartition(1).write.format("delta").mode("append").save(case.delta_root)
diff --git a/pyproject.toml b/pyproject.toml
index 02b27425..0366b111 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,7 +9,7 @@ python = "^3.10"
 pydantic = "^2.6.4"
 pyspark = "^3.5.1"
 click = "^8.1.7"
-delta-spark = "^3.1.0"
+delta-spark = "^4.0.0rc1"
 rootpath = "^0.1.1"
 pyarrow = "^15.0.2"