diff --git a/DeepCpG_DNA/Hou2016_HCC_dna/model.yaml b/DeepCpG_DNA/Hou2016_HCC_dna/model.yaml
index 86873512d..8e85b3096 100644
--- a/DeepCpG_DNA/Hou2016_HCC_dna/model.yaml
+++ b/DeepCpG_DNA/Hou2016_HCC_dna/model.yaml
@@ -11,7 +11,7 @@ args:
 default_dataloader: .
 dependencies:
   conda:
-    - python=3.6.12
+    - python=3.5
     - h5py=2.10.0
     - pip=20.2.4
   pip:
diff --git a/DeepCpG_DNA/Hou2016_HepG2_dna/model.yaml b/DeepCpG_DNA/Hou2016_HepG2_dna/model.yaml
index 82a11e96b..965e8f654 100644
--- a/DeepCpG_DNA/Hou2016_HepG2_dna/model.yaml
+++ b/DeepCpG_DNA/Hou2016_HepG2_dna/model.yaml
@@ -10,7 +10,7 @@ args:
 default_dataloader: .
 dependencies:
   conda:
-    - python=3.6.12
+    - python=3.5
     - h5py=2.10.0
     - pip=20.2.4
   pip:
diff --git a/DeepCpG_DNA/Hou2016_mESC_dna/model.yaml b/DeepCpG_DNA/Hou2016_mESC_dna/model.yaml
index 492d72644..a103d5c89 100644
--- a/DeepCpG_DNA/Hou2016_mESC_dna/model.yaml
+++ b/DeepCpG_DNA/Hou2016_mESC_dna/model.yaml
@@ -10,7 +10,7 @@ args:
 default_dataloader: .
 dependencies:
   conda:
-    - python=3.6.12
+    - python=3.5
     - h5py=2.10.0
     - pip=20.2.4
   pip:
diff --git a/DeepCpG_DNA/Smallwood2014_2i_dna/model.yaml b/DeepCpG_DNA/Smallwood2014_2i_dna/model.yaml
index b1c34161b..d7024abd8 100644
--- a/DeepCpG_DNA/Smallwood2014_2i_dna/model.yaml
+++ b/DeepCpG_DNA/Smallwood2014_2i_dna/model.yaml
@@ -10,7 +10,7 @@ args:
 default_dataloader: .
 dependencies:
   conda:
-    - python=3.6.12
+    - python=3.5
     - h5py=2.10.0
     - pip=20.2.4
   pip:
diff --git a/DeepCpG_DNA/Smallwood2014_serum_dna/model.yaml b/DeepCpG_DNA/Smallwood2014_serum_dna/model.yaml
index 47e8b4009..9ff5419cc 100644
--- a/DeepCpG_DNA/Smallwood2014_serum_dna/model.yaml
+++ b/DeepCpG_DNA/Smallwood2014_serum_dna/model.yaml
@@ -10,7 +10,7 @@ args:
 default_dataloader: .
 dependencies:
   conda:
-    - python=3.6.12
+    - python=3.5
     - h5py=2.10.0
     - pip=20.2.4
   pip: