diff --git a/omicverse/pl/_cpdb.py b/omicverse/pl/_cpdb.py
index 42f3d9fb..65cb507a 100644
--- a/omicverse/pl/_cpdb.py
+++ b/omicverse/pl/_cpdb.py
@@ -540,12 +540,12 @@ def cpdb_group_heatmap(adata,
 
     source_gene_pd=pd.DataFrame(index=cor.index)
     for source_cell in source_cells:
-        source_gene_pd[source_cell]=adata[adata.obs['cell_labels']==source_cell,
+        source_gene_pd[source_cell]=adata[adata.obs[celltype_key]==source_cell,
         [i.split('_')[0] for i in cor.index]].to_df().mean().values
     
     target_gene_pd=pd.DataFrame(index=cor.index)
     for target_cell in target_cells:
-        target_gene_pd[target_cell]=adata[adata.obs['cell_labels']==target_cell,
+        target_gene_pd[target_cell]=adata[adata.obs[celltype_key]==target_cell,
         [i.split('_')[1] for i in cor.index]].to_df().mean().values
 
     cor=pd.concat([source_gene_pd,target_gene_pd],axis=1)
diff --git a/omicverse_guide/docs/Release_notes.md b/omicverse_guide/docs/Release_notes.md
index 7615416b..6db2ce3e 100644
--- a/omicverse_guide/docs/Release_notes.md
+++ b/omicverse_guide/docs/Release_notes.md
@@ -414,3 +414,13 @@ Support Raw Windows platform
 - Fixed an error of `ov.pp.pca` when pcs smaller than 13. #102
 - Added `COMPOSITE` in `ov.pp.qc`'s method to predicted doublet cells. #103
 - Added `species` argument in `score_genes_cell_cycle` to calculate the cell phase without gene manual input
+
+## v 1.6.6
+
+### Pl Module
+
+- Fixed the 'celltyep_key' error of `ov.pl.cpdb_group_heatmap` #109
+
+### Bulk Module
+
+- Fiexed an key error in `ov.bulk.Matrix_ID_mapping`
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index e9d43122..f1bac8e1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ build-backend = "flit_core.buildapi"
 
 [project]
 name = "omicverse"
-version = "1.6.5"
+version = "1.6.6"
 description = "OmicVerse: A single pipeline for exploring the entire transcriptome universe"
 readme = "README.md"
 requires-python = ">=3.8"