diff --git a/.travis.yml b/.travis.yml
index 463704790..827a3162d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -40,7 +40,7 @@ install:
   - pip install -U pip setuptools wheel
   - pip install -U tox==3.12.0
   - pip install -U codecov
-  - tox --notest
+  - travis_wait 15 tox --notest
 
 script:
   - tox
diff --git a/requirements.txt b/requirements.txt
index 456e21d42..8be8d7e7a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@
 #### ESSENTIAL LIBRARIES
 
 # General scientific computing
-numpy>=1.16.0,<2.0.0
+numpy>=1.16.0,<1.20.0
 scipy>=1.2.0,<2.0.0
 
 # Data storage and function application