diff --git a/requirements.txt b/requirements.txt
index edf9394..bf1f946 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1,2 @@
 Adafruit-Blinka
+pyserial
\ No newline at end of file
diff --git a/setup.py b/setup.py
index ff899e3..cd650f6 100644
--- a/setup.py
+++ b/setup.py
@@ -34,7 +34,7 @@
     author='Adafruit Industries',
     author_email='circuitpython@adafruit.com',
 
-    install_requires=['Adafruit-Blinka'],
+    install_requires=['Adafruit-Blinka', 'pyserial'],
 
     # Choose your license
     license='MIT',