diff --git a/src/prisma/generator/templates/builder.py.jinja b/src/prisma/generator/templates/builder.py.jinja
index 6b005917c..4c0e8b66c 100644
--- a/src/prisma/generator/templates/builder.py.jinja
+++ b/src/prisma/generator/templates/builder.py.jinja
@@ -810,9 +810,6 @@ def serialize_datetime(dt: datetime.datetime) -> str:
     elif dt.tzinfo != timezone.utc:
         dt = dt.astimezone(timezone.utc)
 
-    # truncate microseconds to 3 decimal places
-    # https://github.com/RobertCraigie/prisma-client-py/issues/129
-    dt = dt.replace(microsecond=int(dt.microsecond / 1000) * 1000)
     return dt.isoformat()