diff --git a/python/pyproject.toml b/python/pyproject.toml
index 35c2e2c13a..9b8ef8a585 100644
--- a/python/pyproject.toml
+++ b/python/pyproject.toml
@@ -37,13 +37,13 @@ dependencies = [
 ]
 
 [project.optional-dependencies]
-spark = ["pyspark>=3.4.0"]
+spark = ["pyspark>=3.4.0,<4.1.0"]
 pydeck-map = ["geopandas", "pydeck==0.8.0"]
 kepler-map = ["geopandas", "keplergl==0.3.2"]
 flink = ["apache-flink>=1.19.0"]
 db = ["sedonadb[geopandas]; python_version >= '3.9'"]
 all = [
-  "pyspark>=3.4.0",
+  "pyspark>=3.4.0,<4.1.0",
   "geopandas",
   "pydeck==0.8.0",
   "keplergl==0.3.2",
@@ -70,7 +70,7 @@ dev = [
   # cannot set geopandas>=0.14.4 since it doesn't support python 3.8, so we pin fiona to <1.10.0
   "fiona<1.10.0",
   "pyarrow",
-  "pyspark>=3.4.0",
+  "pyspark>=3.4.0,<4.1.0",
   "keplergl==0.3.2",
   "pydeck==0.8.0",
   "pystac==1.5.0",