diff --git a/requirements.txt b/requirements.txt
index a926def..ec44fec 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
-pyarrow
-pandas
+pyarrow==0.9.0.post1
+pandas==0.22.0
diff --git a/setup.py b/setup.py
index 7eca356..7e1a7c1 100644
--- a/setup.py
+++ b/setup.py
@@ -24,8 +24,8 @@
     packages=find_packages(),
     platforms='any',
     install_requires=[
-        'pandas',
-        'pyarrow'
+        'pandas==0.22.0',
+        'pyarrow==0.9.0.post1'
     ],
     entry_points={
         'console_scripts': [