diff --git a/environment.yml b/environment.yml
index 5025c314..e1e71cb3 100644
--- a/environment.yml
+++ b/environment.yml
@@ -19,7 +19,7 @@ dependencies:
  - statsmodels
  - xarray>=2023.04 # because pandas 2 is required
 # for testing
- - black<23.1
+ - black!=23
  - flake8
  - isort
  - pytest
diff --git a/examples/config_tas_cmip6ng_example.py b/examples/config_tas_cmip6ng_example.py
index a7a5ec25..6e7b77b7 100644
--- a/examples/config_tas_cmip6ng_example.py
+++ b/examples/config_tas_cmip6ng_example.py
@@ -1,6 +1,7 @@
 """
 Example configuration file
 """
+
 import os.path
 
 from mesmer.create_emulations import create_seed_dict
diff --git a/mesmer/calibrate_mesmer/calibrate_mesmer.py b/mesmer/calibrate_mesmer/calibrate_mesmer.py
index 34f05e5f..93d7b8bf 100644
--- a/mesmer/calibrate_mesmer/calibrate_mesmer.py
+++ b/mesmer/calibrate_mesmer/calibrate_mesmer.py
@@ -1,6 +1,7 @@
 """
 Functions to calibrate all modules of MESMER
 """
+
 import logging
 import warnings
 
@@ -212,9 +213,7 @@ def _calibrate_tas(
         )
 
         if use_tas2:
-            gt_tas2_s = {
-                scen: gt_tas_scen**2 for scen, gt_tas_scen in gt_tas_s.items()
-            }
+            gt_tas2_s = {scen: gt_tas_scen**2 for scen, gt_tas_scen in gt_tas_s.items()}
 
         if use_hfds:
             gt_hfds_s = gather_gt_data(
diff --git a/mesmer/stats/_gaspari_cohn.py b/mesmer/stats/_gaspari_cohn.py
index e75fc3bb..78b8f69a 100644
--- a/mesmer/stats/_gaspari_cohn.py
+++ b/mesmer/stats/_gaspari_cohn.py
@@ -94,6 +94,7 @@ def _gaspari_cohn_np(r):
     sel = (r >= 0) & (r < 1)
     r_sel = r[sel]
 
+    # fmt: off
     out[sel] = (
         1
         - 5 / 3 * r_sel**2
@@ -101,6 +102,7 @@ def _gaspari_cohn_np(r):
         + 1 / 2 * r_sel**4
         - 1 / 4 * r_sel**5
     )
+    # fmt: on
 
     # compute for 1 <= r < 2
     sel = (r >= 1) & (r < 2)
diff --git a/scripts/test_install.py b/scripts/test_install.py
index 0ff52950..cca0867c 100644
--- a/scripts/test_install.py
+++ b/scripts/test_install.py
@@ -1,6 +1,7 @@
 """Test that all of our modules can be imported
 Thanks https://stackoverflow.com/a/25562415/10473080
 """
+
 import importlib
 import pkgutil
 
diff --git a/setup.cfg b/setup.cfg
index e7dfb348..bb38dd87 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -56,7 +56,7 @@ tests =
 dev =
     %(docs)s
     %(tests)s
-    black < 23
+    black !=23
     flake8
     isort
     twine