diff --git a/tests/utils.py b/tests/utils.py
index 30ca76c..9322ce7 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -12,7 +12,7 @@
     "patient_id": pl.UInt32,
     "timestamp": pl.Datetime("us"),
     "code": pl.Categorical,
-    "numerical_value": pl.Float32,
+    "numerical_value": pl.Float64,
 }