diff --git a/.appveyor.yml b/.appveyor.yml
index a27a5dd..e0b598c 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -145,7 +145,7 @@ build_script:
       }
 
 test_script:
-  - pip install pytest
+  - pip install pytest hypothesis
   - cd ..
   - python check_license.py
   - mkdir tmp_for_test
diff --git a/.travis.yml b/.travis.yml
index 25702c6..acccff6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,7 +4,7 @@ env:
         # Also see DAILY_COMMIT below
         - BUILD_COMMIT=e94cec800304a6a467cf90ce4e7d3e207770b4b4
         - BUILD_DEPENDS=cython
-        - TEST_DEPENDS=pytest
+        - TEST_DEPENDS="pytest hypothesis"
         - PLAT=x86_64
         - UNICODE_WIDTH=32
         - WHEELHOUSE_UPLOADER_USERNAME=travis-worker