diff --git a/requirements.txt b/requirements.txt
index 6e13078..9478f73 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,9 +1,9 @@
 # requirements file
 
 ### BEGIN ###
-pydub==0.9.4
+pydub>=0.9.4
 PyAudio>=0.2.7
-numpy==1.8.2
-scipy==0.12.1
-matplotlib==1.3.1
+numpy>=1.8.2
+scipy>=0.12.1
+matplotlib>=1.3.1
 ### END ###