diff --git a/etc/requirements_dev.txt b/etc/requirements_dev.txt
index 0654e92e..7c9b402b 100644
--- a/etc/requirements_dev.txt
+++ b/etc/requirements_dev.txt
@@ -12,3 +12,7 @@ pyflakes==0.6.1
 # Documentation Conversion
 
 pyandoc==0.0.1
+
+# Example scripts that are run during unit tests use the following:
+
+matplotlib==1.2.1