diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 74b6822..d4c35ce 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -14,7 +14,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v1
       with:
-        python-version: '3.6'
+        python-version: '3.8'
 
     - name: Install dependencies
       run: |
diff --git a/README.rst b/README.rst
index 1049bf5..8dc8a7d 100644
--- a/README.rst
+++ b/README.rst
@@ -7,6 +7,10 @@ jupyter-ui-poll
 
 Block Jupyter cell execution while interacting with widgets.
 
+.. note::
+
+   This version only works with ipykernel 5.* series. 
+
 This library is for people familiar with ``ipywidgets`` who want to solve the
 following problem:
 
diff --git a/setup.cfg b/setup.cfg
index 43d50f4..a3c1039 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = jupyter-ui-poll
-version = 0.1.2
+version = 0.1.3
 
 description = Block jupyter cell execution while interacting with widgets
 long_description = file: README.rst
@@ -31,7 +31,7 @@ test_suite = tests
 setup_requires =
     setuptools
 install_requires =
-    ipython
+    ipykernel<6
 test_requires =
     pytest