diff --git a/.travis.yml b/.travis.yml
index 12aa5e8f..04e05740 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -22,6 +22,7 @@ jobs:
     python: "3.6"
     script: ./travis-build.sh
   - name: "Smoke Tests"
+    python: "3.6"
     if: branch = master AND type = cron
     script:
       - npm run --prefix client/ smoke-test
diff --git a/server/requirements.txt b/server/requirements.txt
index 3640bff6..e0c0c0c3 100644
--- a/server/requirements.txt
+++ b/server/requirements.txt
@@ -7,7 +7,7 @@ Flask-Cors>=3.0.6
 Flask-RESTful>=0.3.6
 flatbuffers>=1.10.0
 matplotlib>=2.2
-numpy>=1.14.5
+numpy>=1.15.2
 pandas>=0.23.1
 scanpy>=1.3.2
 scipy>=1.1.0