diff --git a/boututils/__init__.py b/boututils/__init__.py
index 7d851de..a3f8128 100644
--- a/boututils/__init__.py
+++ b/boututils/__init__.py
@@ -38,5 +38,5 @@
     do_import.append('View3D')
     __all__ = do_import
 
-__version__ = '0.1.2'
+__version__ = '0.1.3'
 __name__ = 'boututils'
diff --git a/requirements.txt b/requirements.txt
index 292be85..ec9bd5d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,6 +4,6 @@ h5py==2.9.0
 scipy==1.2.1
 future==0.17.1
 bunch==1.0.1
-PyQt5==5.12.2
-mayavi==4.6.2
+PyQt5==5.12.2 [mayavi]
+mayavi==4.6.2 [mayavi]
 netCDF4==1.5.1.2
diff --git a/setup.py b/setup.py
index bd9939f..db9e003 100644
--- a/setup.py
+++ b/setup.py
@@ -51,9 +51,9 @@
                       'boututils',
                       'future',
                       'bunch',
-                      'PyQt5',
-                      'mayavi',
                       'netCDF4'],
+    extras_require={
+                    'mayavi': ['mayavi', 'PyQt5']},
     classifiers=[
         'Programming Language :: Python :: 3',
         ('License :: OSI Approved :: '