diff --git a/.travis.yml b/.travis.yml
index cadf81e..4028d66 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,28 +4,18 @@ os:
 - linux
 python:
 - '3.6'
-sudo: enabled
-addons:
-  apt:
-    packages:
-    - libopenmpi-dev
-    - libglib2.0-0
-    - libgl1-mesa-glx
-    - qt5-default
-    - packagekit-gtk3-module
-    - libcanberra-gtk-module
 install:
-- pip install requests
 - pip install https://github.com/SpikeInterface/spikeextractors/archive/master.zip
 - pip install https://github.com/SpikeInterface/spikesorters/archive/master.zip
 - pip install https://github.com/SpikeInterface/spiketoolkit/archive/master.zip
 - pip install https://github.com/SpikeInterface/spikewidgets/archive/master.zip
 - pip install .
+- pip install pytest==4.3
+- pip install matplotlib==3.2.2
+- pip install herdingspikes==0.3.7
 - pip install pyqt5==5.13
 - pip install hdbscan
 - pip install tridesclous==1.6.0
-- pip install herdingspikes==0.3.6
-- pip install pytest==4.3
 script: python -m pytest
 deploy:
   provider: pypi
diff --git a/spikecomparison/tests/test_groundtruthstudy.py b/spikecomparison/tests/test_groundtruthstudy.py
index 25e05f4..f6d4d0e 100644
--- a/spikecomparison/tests/test_groundtruthstudy.py
+++ b/spikecomparison/tests/test_groundtruthstudy.py
@@ -7,6 +7,7 @@
 
 import spikeextractors as se
 
+import spikesorters as ss
 from spikecomparison.groundtruthstudy import GroundTruthStudy
 
 study_folder = 'test_groundtruthstudy/'
@@ -34,6 +35,8 @@ def _setup_comparison_study():
 def _run_study_sorters():
     study = GroundTruthStudy(study_folder)
     sorter_list = ['tridesclous', 'herdingspikes']
+    print(f"\n#################################\nINSTALLED SORTERS\n#################################\n"
+          f"{ss.installed_sorters()}")
     study.run_sorters(sorter_list)