diff --git a/prodekanus/requirements.txt b/prodekanus/requirements.txt
index 36e8f80..187ae52 100644
--- a/prodekanus/requirements.txt
+++ b/prodekanus/requirements.txt
@@ -4,7 +4,7 @@ certifi==2017.7.27.1
 chardet==3.0.4
 dmarc-policy-parser==0.1
 emailtunnel==0.2
-idna==2.5
+idna==3.7
 mysqlclient==1.3.10
 pkg-resources==0.0.0
 requests==2.18.3