diff --git a/requirements-dev.txt b/requirements-dev.txt
index 6cee303..8cd439b 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -81,7 +81,7 @@ flask-marshmallow==1.5.0
     # via apiflask
 html5rdf==1.2.1
     # via rdflib
-idna==3.18
+idna==3.15
     # via
     #   email-validator
     #   requests
diff --git a/requirements.txt b/requirements.txt
index 4239713..6a24750 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -71,7 +71,7 @@ flask-marshmallow==1.3.0
     # via apiflask
 html5rdf==1.2.1
     # via rdflib
-idna==3.10
+idna==3.15
     # via
     #   email-validator
     #   requests