diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 271b63b1ab357e1fd8c4b182e9b3d069877cb5b0..7903c82e9a8d8448f8084bb01e5662548b07adeb 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -92,7 +92,7 @@ before_script:
 
   # Script from Ingo Heimbach:
   - apt-get update
-  - apt-get install -y curl bzip2 git
+  - apt-get install -y curl bzip2 git mesa-utils
   - curl -O -L https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh
   - chmod +x Miniconda3-latest-Linux-x86_64.sh
   - ./Miniconda3-latest-Linux-x86_64.sh -b -p /opt/miniconda3
diff --git a/environment.yml b/environment.yml
index 47f705085c943ff3b72fa6795c2da458ef4a3392..e700f4dacee70eee2b94959ed3eec176d16517f7 100644
--- a/environment.yml
+++ b/environment.yml
@@ -22,14 +22,15 @@ dependencies:
   - pyFFTW=0.10
   # File IO:
   - hyperspy=1.3
-  - hyperspy-gui-ipywidgets=1.0
-  - hyperspy-gui-traitsui=1.0  # TODO: Optional! Delete when mayavi is gone!
+  # - hyperspy-gui-ipywidgets=1.0
+  # - hyperspy-gui-traitsui=1.0  # TODO: Optional! Delete when mayavi is gone!
   - h5py=2.7
   # Plotting and colors:  # TODO: Shift to plotting package?
   - matplotlib=2.0  # Only works with qt4 from conda-forge channel!
   - Pillow=4.1
   - cmocean=1.1
-  - qt=4.8  # Necessary because of traits in mayavi...
+  # - qt=4.8  # Necessary because of traits in mayavi...
+  - pyqt=5.6.0
   - mayavi=4.5  # TODO: Get rid of!
   #- colorspacious  # TODO: NOT USED?
   #- visvis  # TODO: NOT USED?