diff --git a/caiman/source_extraction/cnmf/params.py b/caiman/source_extraction/cnmf/params.py
index da5133429..867116022 100644
--- a/caiman/source_extraction/cnmf/params.py
+++ b/caiman/source_extraction/cnmf/params.py
@@ -579,7 +579,7 @@ def __init__(self, fnames=None, dims=None, dxy=(1, 1),
             'decay_time': decay_time,
             'dxy': dxy,
             'var_name_hdf5': var_name_hdf5,
-            'caiman_version': '1.6.3',
+            'caiman_version': '1.6.4',
             'last_commit': None,
             'mmap_F': None,
             'mmap_C': None
diff --git a/environment.yml b/environment.yml
index 4af2951d8..44783f309 100644
--- a/environment.yml
+++ b/environment.yml
@@ -25,7 +25,7 @@ dependencies:
 - scikit-image
 - scikit-learn
 - scipy
-- tifffile
+- tifffile=0.15.1
 - tk=8.6.8
 - tqdm
 - yapf