diff --git a/bw2io/importers/simapro_block_csv.py b/bw2io/importers/simapro_block_csv.py
index 94d4179..1a9fb0e 100644
--- a/bw2io/importers/simapro_block_csv.py
+++ b/bw2io/importers/simapro_block_csv.py
@@ -2,7 +2,7 @@
 import warnings
 from io import StringIO
 from pathlib import Path
-from typing import Optional
+from typing import Optional, Union
 
 from bw2data import Database, config, databases, labels
 from bw_simapro_csv import SimaProCSV
@@ -39,7 +39,7 @@ class SimaProBlockCSVImporter(LCIImporter):
 
     def __init__(
         self,
-        path_or_stream: Path | StringIO,
+        path_or_stream: Union[Path, StringIO],
         database_name: Optional[str] = None,
         biosphere_database_name: Optional[str] = None,
     ):
diff --git a/pyproject.toml b/pyproject.toml
index 77081c7..4bb3986 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,7 +39,7 @@ dependencies = [
     "bw2parameters>=1.1.0",
     "bw_migrations>=0.2",
     "bw_processing>=0.8.5",
-    "bw_simapro_csv>=0.2",
+    "bw_simapro_csv>=0.2.3",
     "lxml",
     "mrio_common_metadata",
     "multifunctional>=0.5",