diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..a282544
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,16 @@
+backports.functools-lru-cache==1.6.1
+biopython==1.76
+cycler==0.10.0
+kiwisolver==1.1.0
+matplotlib==2.2.4
+nose==1.3.7
+numpy==1.14.5
+pandas==0.19.2
+pyparsing==2.4.6
+python-dateutil==2.8.1
+pytz==2019.3
+scikit-learn==0.17.1
+scipy==1.2.1
+six==1.14.0
+subprocess32==3.5.4
+xlrd==1.2.0
diff --git a/setup.py b/setup.py
index 7fcea42..dca64a7 100755
--- a/setup.py
+++ b/setup.py
@@ -9,7 +9,14 @@
       description=("Machine Learning-Based Predictive Modelling of CRISPR/Cas9 guide efficiency"),
       packages=["azimuth", "azimuth.features", "azimuth.models", "azimuth.tests"],
       package_data={'azimuth': ['saved_models/*.*']},
-      install_requires=['scipy', 'numpy', 'matplotlib', 'nose', 'scikit-learn>=0.17.1,<0.18', 'pandas', 'biopython'],
+      install_requires=['scipy==1.2.1',
+                        'numpy==1.14.5',
+                        'matplotlib==2.2.4',
+                        'nose',
+                        'scikit-learn>=0.17.1,<0.18',
+                        'pandas==0.19.2',
+                        'biopython',
+                        'xlrd>=1.0.0'],
       license="BSD",
       # ext_modules=cythonize("ssk_cython.pyx"),
       )