diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 25d3013..155eea8 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -251,7 +251,6 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         python -m pip install pytest pytest-benchmark pytest-env build cython
-        python -m pip install python-tk
         python -m pip install numpy scipy matplotlib>=3.0.0
     - name: Compile and install
       run: |
@@ -265,7 +264,7 @@ jobs:
     - name: Test with pytest
       run: |
         mv dtaidistance dtaidistance_pkg
-        pytest --ignore=venv --benchmark-skip
+        pytest --ignore=venv --benchmark-skip -c pytest-noviz.ini
         mv dtaidistance_pkg dtaidistance
     - name: Build
       run: |
diff --git a/pytest-noviz.ini b/pytest-noviz.ini
new file mode 100644
index 0000000..14924df
--- /dev/null
+++ b/pytest-noviz.ini
@@ -0,0 +1,4 @@
+[pytest]
+env =
+	DTAIDISTANCE_TESTWITHOUTVIZ=1
+