diff --git a/ci/deps/travis-36.yaml b/ci/deps/travis-36.yaml
index 37cea281d48a6..1085ecd008fa6 100644
--- a/ci/deps/travis-36.yaml
+++ b/ci/deps/travis-36.yaml
@@ -21,7 +21,7 @@ dependencies:
   - pymysql
   - pytables
   - python-snappy
-  - python=3.6*
+  - python=3.6.6
   - pytz
   - s3fs
   - scikit-learn