diff --git a/.github/workflows/python-test.yml b/.github/workflows/python-test.yml
index d41468a..7702a51 100644
--- a/.github/workflows/python-test.yml
+++ b/.github/workflows/python-test.yml
@@ -55,7 +55,7 @@ jobs:
       # install testing
       - name: Install package and test deps
         run: |
-          pip install .[testing] # install the package and the testing deps
+          pip install .[multifunctional,testing] # install the package and the testing deps
 
       - name: Test with pytest
         run: |
diff --git a/bw2io/__init__.py b/bw2io/__init__.py
index c0a13ae..c59e629 100644
--- a/bw2io/__init__.py
+++ b/bw2io/__init__.py
@@ -40,7 +40,6 @@
     "restore_project_directory",
     "SimaProCSVImporter",
     "SimaProLCIACSVImporter",
-    "SimaProBlockCSVImporter",
     "SingleOutputEcospold1Importer",
     "SingleOutputEcospold2Importer",
     "unlinked_data",
@@ -84,7 +83,6 @@
     Exiobase3HybridImporter,
     Exiobase3MonetaryImporter,
     MultiOutputEcospold1Importer,
-    SimaProBlockCSVImporter,
     SimaProCSVImporter,
     SimaProLCIACSVImporter,
     SingleOutputEcospold1Importer,
@@ -97,6 +95,12 @@
 from .unlinked_data import UnlinkedData, unlinked_data
 from .utils import activity_hash, es2_activity_hash, load_json_data_file
 
+try:
+    from .importers import SimaProBlockCSVImporter
+    __all__.append("SimaProBlockCSVImporter")
+except ImportError:
+    pass
+
 try:
     from .ecoinvent import import_ecoinvent_release
 except ImportError:
diff --git a/bw2io/importers/__init__.py b/bw2io/importers/__init__.py
index bfe73c1..e150c8e 100644
--- a/bw2io/importers/__init__.py
+++ b/bw2io/importers/__init__.py
@@ -11,14 +11,11 @@
 from .excel_lcia import CSVLCIAImporter, ExcelLCIAImporter
 from .exiobase3_hybrid import Exiobase3HybridImporter
 from .exiobase3_monetary import Exiobase3MonetaryImporter
-from .simapro_block_csv import SimaProBlockCSVImporter
 from .simapro_csv import SimaProCSVImporter
 from .simapro_lcia_csv import SimaProLCIACSVImporter
 
-"""
-This module provides classes for importing Life Cycle Impact Assessment (LCIA) data
-from different file formats.
-
-"""
-
-# Import classes for LCIA data import
+try:
+    from .simapro_block_csv import SimaProBlockCSVImporter
+except ImportError:
+    from bw2data.logs import stdout_feedback_logger
+    stdout_feedback_logger.warning("Can't import `SimaProBlockCSVImporter` - please install `bw2io` with `pip install bw2io[multifunctional]` or install `multifunctional` and `bw_simapro_csv` manually.")
diff --git a/bw2io/importers/base_lci.py b/bw2io/importers/base_lci.py
index 3fe1c5d..0ef1472 100644
--- a/bw2io/importers/base_lci.py
+++ b/bw2io/importers/base_lci.py
@@ -275,11 +275,15 @@ def _write_activity_parameters(self, activity_parameters: List[dict]) -> None:
     def database_class(
         self, db_name: str, requested_backend: str = "sqlite"
     ) -> ProcessedDataStore:
-        from multifunctional import MultifunctionalDatabase
+        try:
+            from multifunctional import MultifunctionalDatabase
 
-        if self.needs_multifunctional_database:
-            return MultifunctionalDatabase(db_name)
-        else:
+            if self.needs_multifunctional_database:
+                return MultifunctionalDatabase(db_name)
+            else:
+                return Database(db_name, backend=requested_backend)
+
+        except ImportError:
             return Database(db_name, backend=requested_backend)
 
     def write_database(
diff --git a/bw2io/importers/simapro_block_csv.py b/bw2io/importers/simapro_block_csv.py
index dd68c95..69172a7 100644
--- a/bw2io/importers/simapro_block_csv.py
+++ b/bw2io/importers/simapro_block_csv.py
@@ -65,15 +65,21 @@ def __init__(
             override_process_name_using_single_functional_exchange,
             drop_unspecified_subcategories,
             split_simapro_name_geo,
-            create_products_as_new_nodes,
-            link_technosphere_based_on_name_unit_location,
+        ]
+        if not separate_products:
+            self.strategies.extend([
+                create_products_as_new_nodes,
+                link_technosphere_based_on_name_unit_location,
+            ])
+        self.strategies.extend([
             functools.partial(
                 link_iterable_by_fields,
                 other=Database(biosphere_database_name or config.biosphere),
                 edge_kinds=labels.biosphere_edge_types,
+                fields=("name", "categories", "unit", "location")
             ),
             match_internal_simapro_simapro_with_unit_conversion,
-        ]
+        ])
 
     def create_regionalized_biosphere_proxies(self, database_name: str) -> None:
         """
diff --git a/pyproject.toml b/pyproject.toml
index 36814c8..20e7328 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,23 +34,21 @@ classifiers = [
 ]
 requires-python = ">=3.9"
 dependencies = [
-    "bw2calc>=2.0.dev14",
-    "bw2data>=4.0.dev47",
+    "bw2calc>=2.0",
+    "bw2data>=4.3",
     "bw2parameters>=1.1.0",
     "bw_migrations>=0.2",
-    "bw_processing>=0.8.5",
-    "bw_simapro_csv>=0.2.3",
+    "bw_processing>=1.0",
     "lxml",
     "mrio_common_metadata",
-    "multifunctional>=0.5",
-    "numpy",
+    "numpy<2",
     "openpyxl",
     "platformdirs",
     "pydantic",
     "SPARQLWrapper",
     "pyecospold",
-    "randonneur>=0.4",
-    "randonneur_data",
+    "randonneur>=0.6",
+    "randonneur_data>=0.5.4",
     "requests",
     "scipy",
     "stats_arrays>=0.6.5",
@@ -69,6 +67,11 @@ tracker = "https://github.com/brightway-lca/brightway2-io/issues"
 [project.optional-dependencies]
 # Getting recursive dependencies to work is a pain, this
 # seems to work, at least for now
+multifunctional = [
+    "bw2io",
+    "multifunctional>=1.0",
+    "bw_simapro_csv>=0.3.2",
+]
 testing = [
     "bw2io",
     "pytest",
diff --git a/tests/simapro_block.py b/tests/simapro_block.py
index dfc7d37..3c9a4b3 100644
--- a/tests/simapro_block.py
+++ b/tests/simapro_block.py
@@ -1,17 +1,22 @@
+import pytest
+
 from bw2data import Database, get_node
 from bw2data.tests import bw2test
 
-from bw2io.importers import SimaProBlockCSVImporter
-
-
-class Mock(SimaProBlockCSVImporter):
-    # Mock to skip CSV extraction
-    def __init__(self):
-        return
+try:
+    from bw2io.importers import SimaProBlockCSVImporter
+except ImportError:
+    SimaProBlockCSVImporter = None
 
 
+@pytest.mark.skipif(not SimaProBlockCSVImporter, reason="Dependencies for this test not installed")
 @bw2test
 def test_create_regionalized_biosphere_proxies():
+    class Mock(SimaProBlockCSVImporter):
+        # Mock to skip CSV extraction
+        def __init__(self):
+            return
+
     importer = Mock()
     importer.db_name = "database-name"
     importer.data = [