diff --git a/requirements.txt b/requirements.txt
index c571b86..83b5ee5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,6 +16,7 @@ flask-appconfig==0.9.1
 itsdangerous==0.24
 nose==1.3.3
 pydns==2.3.6
+recaptcha-client==1.0.6
 six==1.7.3
 validate-email==1.1
 wsgiref==0.1.2