diff --git a/cell2cell/__init__.py b/cell2cell/__init__.py
index 660d239..9f6d39d 100644
--- a/cell2cell/__init__.py
+++ b/cell2cell/__init__.py
@@ -12,4 +12,4 @@
 from cell2cell import tensor
 from cell2cell import utils
 
-__version__ = "0.6.5"
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+__version__ = "0.6.6"
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diff --git a/release/0.6.6-notes.md b/release/0.6.6-notes.md
new file mode 100644
index 0000000..c895ca0
--- /dev/null
+++ b/release/0.6.6-notes.md
@@ -0,0 +1,17 @@
+# Release Notes - cell2cell v0.6.6
+
+## New features
+- Added new attributes and methods to `cell2cell.tensor.tensor.BaseTensor` and any other
+derived class, including `BaseTensor.shape`, `BaseTensor.write_file()`, `BaseTensor.to_device()`.
+These new features are respectively for:
+    - Passing the shape of the tensor directly (instead of `BaseTensor.tensor.shape`)
+    - Export or save a tensor object to a file.
+    - Change the device for running Tensor-cell2cell (e.g. 'cpu', 'cuda', etc.)
+- 
+## Feature updates
+- Added **kwargs as parameter of `cell2cell.analysis.tensor_pipelines.run_tensor_cell2cell_pipeline()`
+to directly pass parameters to the functions running the elbow analysis and the tensor decomposition.
+- Sort factors numerically in `cell2cell.external.gseapy.run_gsea()`.
+ 
+## Fixed Bugs
+- 
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