diff --git a/ibllib/__init__.py b/ibllib/__init__.py
index ced9677a9..dd65637e3 100644
--- a/ibllib/__init__.py
+++ b/ibllib/__init__.py
@@ -2,7 +2,7 @@
 import logging
 import warnings
 
-__version__ = '2.40.1'
+__version__ = '2.40.2'
 warnings.filterwarnings('always', category=DeprecationWarning, module='ibllib')
 
 # if this becomes a full-blown library we should let the logging configuration to the discretion of the dev
diff --git a/ibllib/pipes/mesoscope_tasks.py b/ibllib/pipes/mesoscope_tasks.py
index 2547bdc96..d46aa8cec 100644
--- a/ibllib/pipes/mesoscope_tasks.py
+++ b/ibllib/pipes/mesoscope_tasks.py
@@ -790,7 +790,7 @@ def _run(self, rename_files=True, use_badframes=True, **kwargs):
 
         # If applicable, save as bad_frames.npy in first raw_imaging_folder for suite2p
         # badframes.mat contains QC values that do affect ROI detection (e.g. no PMT, lens artefacts)
-        badframes = np.array([], dtype='i8')
+        badframes = np.array([], dtype='uint32')
         total_frames = 0
         # Ensure all indices are relative to total cumulative frames
         for m, collection in zip(all_meta, raw_image_collections):
diff --git a/release_notes.md b/release_notes.md
index de1077ce0..d25c71d7e 100644
--- a/release_notes.md
+++ b/release_notes.md
@@ -7,6 +7,9 @@
 #### 2.40.1
 - Bugfix: ibllib.io.sess_params.merge_params supports tasks extractors key
 
+#### 2.40.2
+- Bugfix: badframes array dtype change int8 -> uint32
+
 ## Release Note 2.39.0
 
 ### features
@@ -21,7 +24,7 @@
 
 #### 2.39.1
 - Bugfix: brainbox.metrics.single_unit.quick_unit_metrics fix for indexing of n_spike_below2
--
+
 #### 2.39.2
 - Bugfix: routing of protocol to extractor through the project repository checks that the
 target is indeed an extractor class.