diff --git a/requirements_cove.txt b/requirements_cove.txt
index 597bb2e..05565c6 100644
--- a/requirements_cove.txt
+++ b/requirements_cove.txt
@@ -53,7 +53,7 @@ flattentool==0.27.0
     #   -r requirements_cove.in
     #   libcove
     #   libcoveweb
-idna==3.10
+idna==3.15
     # via requests
 ijson==3.3.0
     # via
diff --git a/requirements_cove_dev.txt b/requirements_cove_dev.txt
index 00e6281..0e4ca09 100644
--- a/requirements_cove_dev.txt
+++ b/requirements_cove_dev.txt
@@ -100,7 +100,7 @@ h11==0.14.0
     # via wsproto
 hypothesis==6.13.0
     # via -r requirements_cove_dev.in
-idna==3.10
+idna==3.15
     # via
     #   requests
     #   trio
diff --git a/requirements_cove_dokku.txt b/requirements_cove_dokku.txt
index c6b5889..91afca0 100644
--- a/requirements_cove_dokku.txt
+++ b/requirements_cove_dokku.txt
@@ -72,7 +72,7 @@ flattentool==0.27.0
     #   libcoveweb
 gunicorn==23.0.0
     # via -r requirements_cove_dokku.in
-idna==3.10
+idna==3.15
     # via
     #   -r requirements_cove.txt
     #   requests