diff --git a/prodekanus/requirements.txt b/prodekanus/requirements.txt
index 36e8f80..229270f 100644
--- a/prodekanus/requirements.txt
+++ b/prodekanus/requirements.txt
@@ -1,4 +1,4 @@
-aiosmtpd==1.1
+aiosmtpd==1.4.5
 atpublic==0.5
 certifi==2017.7.27.1
 chardet==3.0.4