travis: use 'pip install --ignore-installed --upgrade' to fix build

HEPData · Jun 12, 2020 · 70b62fb · 70b62fb
1 parent 1f98598
commit 70b62fb
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/.travis.yml b/.travis.yml
@@ -44,7 +44,7 @@ before_install:
   - "travis_retry pip install --upgrade pip setuptools wheel coveralls"
 
 install:
-  - "travis_retry pip install -e .[tests]"
+  - "travis_retry pip install --ignore-installed --upgrade -e .[tests]"
 
 script:
   - "pytest testsuite"