diff --git a/requirements.txt b/requirements.txt
index 7b599f0..b23efa4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,7 @@
 
 numpy
 matplotlib
+scipy
 seaborn
 pandas
 requests
diff --git a/setup.py b/setup.py
index 8519bff..e2a96db 100644
--- a/setup.py
+++ b/setup.py
@@ -9,7 +9,7 @@
     packages=find_packages(),
     package_data={'rabdam': ['Subroutines/HTML_stylesheet.css',
                              'Subroutines/HTML_stylesheet.js']},
-    version='1.6.1',
+    version='1.6.3',
     description=('RABDAM: A program to identify and quantify specific '
                  'radiation damage within individual protein crystal '
                  'structures'),
@@ -22,8 +22,8 @@
     license='LGPL v3',
     keywords=['radiation damage', 'specific damage', 'atomic Bfactors',
               'atomic displacement parameters', 'BDamage', 'Bnet'],
-    install_requires=['numpy', 'matplotlib', 'seaborn', 'pandas', 'requests',
-                      'setuptools'],
+    install_requires=['numpy', 'matplotlib', 'scipy', 'seaborn', 'pandas',
+                      'requests', 'setuptools'],
     classifiers=['Programming Language :: Python'],
     python_requires=('>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, '
                      '!=3.5.*, <4'),