diff --git a/requirements.txt b/requirements.txt
index d657051a..e19f4f99 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -127,7 +127,7 @@ gunicorn==23.0.0
     # via -r requirements.in
 html5lib==1.1
     # via wagtail
-idna==3.10
+idna==3.15
     # via requests
 isodate==0.7.2
     # via azure-storage-blob
diff --git a/requirements_dev.txt b/requirements_dev.txt
index fb714765..9b8d6b1b 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -200,7 +200,7 @@ html5lib==1.1
     # via
     #   -r requirements.txt
     #   wagtail
-idna==3.10
+idna==3.15
     # via
     #   -r requirements.txt
     #   requests