diff --git a/installer/construct.yaml b/installer/construct.yaml
index 21a2013..da860ff 100644
--- a/installer/construct.yaml
+++ b/installer/construct.yaml
@@ -7,8 +7,8 @@ channels:
   - https://conda.anaconda.org/dedop
 
 specs:
-  - python 3.5*
-  - cate-util 0.7.0*
+  - python >=3.5,<3.6
+  - cate-util 0.7.0* # need to be modified to using '>' or '<' after there is an official release of this lib
   - dedop
   - conda
   - jupyter
diff --git a/recipe/meta.yaml b/recipe/meta.yaml
index 693dd3a..b6c817b 100644
--- a/recipe/meta.yaml
+++ b/recipe/meta.yaml
@@ -21,14 +21,14 @@ source:
 
 requirements:
   build:
-    - python 3.5*
+    - python >=3.5,<3.6
     - setuptools
     - pytest
     - pytest-cov
 
   run:
-    - python 3.5*
-    - cate-util 0.7.0*
+    - python >=3.5
+    - cate-util 0.7.0*  # need to be modified to using '>' or '<' after there is an official release of this lib
     - numpy
     - scipy
     - netcdf4