diff --git a/pyproject.toml b/pyproject.toml
index 8a163ff..516545c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,7 +9,7 @@ requires-python = ">=3.12"
 dependencies = [
     "aieng-topic-impl",
     "filelock==3.29.0",
-    "idna>=3.17",
+    "idna>=3.18",
     "jupyter-server>=2.19.0",
     "jupyterlab>=4.5.7",
     "mistune>=3.2.0",
diff --git a/uv.lock b/uv.lock
index b694fef..66fd2e4 100644
--- a/uv.lock
+++ b/uv.lock
@@ -50,7 +50,7 @@ dev = [
 requires-dist = [
     { name = "aieng-topic-impl", editable = "aieng-topic-impl" },
     { name = "filelock", specifier = "==3.29.0" },
-    { name = "idna", specifier = ">=3.17" },
+    { name = "idna", specifier = ">=3.18" },
     { name = "jupyter-server", specifier = ">=2.19.0" },
     { name = "jupyterlab", specifier = ">=4.5.7" },
     { name = "mistune", specifier = ">=3.2.0" },
@@ -745,11 +745,11 @@ wheels = [
 
 [[package]]
 name = "idna"
-version = "3.17"
+version = "3.18"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/b9/28/99c51f664567218d824af024c0251650fb27e4ca066df188dab0769c5b91/idna-3.17.tar.gz", hash = "sha256:5eb0cb53bc467c12eadcf6de83163ad8527cec9416f44b9b61b19caedad2b87f", size = 196048, upload-time = "2026-05-28T14:32:38.55Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/cd/63/9496c57188a2ee585e0f1db071d75089a11e98aa86eb99d9d7618fc1edce/idna-3.18.tar.gz", hash = "sha256:ffb385a7e039654cef1ab9ef32c6fafe283c0c0467bba1d9029738ce4a14a848", size = 196711, upload-time = "2026-06-02T14:34:07.794Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/de/a7/f76514cc40ad6234098ecdebda08732d75964776c51a42845b7da10649e2/idna-3.17-py3-none-any.whl", hash = "sha256:466e48829084efe2548012b855df21540b96f2e20e51bd124c851536556a592c", size = 65316, upload-time = "2026-05-28T14:32:37.035Z" },
+    { url = "https://files.pythonhosted.org/packages/1e/5e/d4e9f1a599fb8e573b7b87160658329fbf28d19eac2718f51fc3def3aa5a/idna-3.18-py3-none-any.whl", hash = "sha256:7f952cbe720b688055e3f87de14f5c3e5fdaa8bc3928985c4077ca689de849a2", size = 65455, upload-time = "2026-06-02T14:34:06.319Z" },
 ]
 
 [[package]]