diff --git a/.travis.yml b/.travis.yml
index 0edce645..6cbe37a2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -26,7 +26,7 @@ before_install:
 
 
 install:
-  - conda install numpy
+  - conda install numpy==1.15
   - conda install scipy
   - conda install matplotlib
   - conda install pandas
diff --git a/environment.yml b/environment.yml
index 3d7ff289..34d7edee 100644
--- a/environment.yml
+++ b/environment.yml
@@ -3,7 +3,7 @@ dependencies:
 - python==3.6
 - matplotlib
 - scipy
-- numpy
+- numpy==1.15
 - pandas
 - pip:
     - cvxpy