diff --git a/.travis.yml b/.travis.yml
index b406190..26ca3d5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,7 +14,7 @@ install:
   - conda config --add channels defaults
   - conda config --add channels bioconda
   - conda config --add channels conda-forge
-  - conda install blast pytest
+  - conda install --yes blast pytest
   - pip install .
 script:
   - pytest
diff --git a/requirements.txt b/requirements.txt
index b5ba381..18baf41 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,8 +1,4 @@
-six
-pandas>=0.20.3
-scikit-learn
-scikit-bio
+pandas
 dna_features_viewer
 tqdm
-suffix-trees
 statsmodels
diff --git a/setup.cfg b/setup.cfg
index 0ddb90b..3f8ea3f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -19,7 +19,6 @@ classifiers =
 packages = find:
 python_requires = >=3.3
 install_requires =
-    six,
     pandas
     dna_features_viewer
     tqdm