diff --git a/requirements-dev.txt b/requirements-dev.txt
index 85f74de..ab5dc20 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -23,7 +23,7 @@ docutils==0.22.4
     #   myst-parser
     #   sphinx
     #   sphinx-rtd-theme
-idna==3.17
+idna==3.18
     # via requests
 imagesize==2.0.0
     # via sphinx
diff --git a/requirements.txt b/requirements.txt
index 6ea1ce2..3a16335 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ certifi==2026.5.20
     # via requests
 charset-normalizer==3.4.7
     # via requests
-idna==3.17
+idna==3.18
     # via requests
 requests==2.34.2
     # via pyUSPTO (pyproject.toml)