diff --git a/tox.ini b/tox.ini
index d0f9361..1501eb8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -19,7 +19,6 @@ deps = nose
        pytest-mock
        hypothesis>4
        python-barcode
-       viivakoodi
 commands = pytest --cov escpos
 passenv = ESCPOS_CAPABILITIES_PICKLE_DIR ESCPOS_CAPABILITIES_FILE CI TRAVIS TRAVIS_* APPVEYOR APPVEYOR_* CODECOV_*
 
@@ -29,6 +28,7 @@ changedir = doc
 deps = sphinx>=1.5.1
        setuptools_scm
        python-barcode
+       sphinxcontrib-spelling>=5
 commands = sphinx-build -W -b html -d {envtmpdir}/doctrees .  {envtmpdir}/html
 
 [testenv:flake8]