diff --git a/src/Python3/challenger.ipynb b/src/Python3/challenger.ipynb
index 6bd46b06c2003d949868bacf1a85f42d3ff4c590..760d11e66a451fbf36f935db0d8dc2faa377d3e5 100644
--- a/src/Python3/challenger.ipynb
+++ b/src/Python3/challenger.ipynb
@@ -728,7 +728,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.0"
+   "version": "3.6.5rc1"
   }
  },
  "nbformat": 4,