diff --git a/enstools/feature/identification/identification.py b/enstools/feature/identification/identification.py
index 47387697393e21a43fccb52ff9f96180090a2465..60ebefd2303ad1bdf08708ce4e26a09e2e84b4a6 100644
--- a/enstools/feature/identification/identification.py
+++ b/enstools/feature/identification/identification.py
@@ -234,7 +234,7 @@ class IdentificationStrategy(ABC):
         mb = xr.map_blocks(self.identify_block, ds_rechunked, args=[index_field], kwargs=dict_split_arrays,
                            template=ds_rechunked)
         print("Start")
-        ds_mapped = mb.compute(num_workers=1)  # num_workers=4
+        ds_mapped = mb.compute()  # num_workers=4
 
         # postprocess
         ds_mapped, self.pb_dataset = self.postprocess(ds_mapped, self.pb_dataset)
diff --git a/install_instructions.txt b/install_instructions.txt
index 696c9ddda3d4a9f6e3f20ed938d0ba7ae808b813..11c37fd329f0ab547e10703363092a91ddd4cf1c 100644
--- a/install_instructions.txt
+++ b/install_instructions.txt
@@ -23,7 +23,7 @@ conda config --set channel_priority strict
 # Also need to downgrade numpy
 
 conda install -c conda-forge cartopy
-pip install wheel numpy==1.20.0
+pip install wheel numpy==1.21.6
 
 # Integrate git and the public enstools repo
 pip install -e git+https://github.com/wavestoweather/enstools.git@main#egg=enstools