diff --git a/dev-requirements.txt b/dev-requirements.txt
index 068f090..dc78e64 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -19,7 +19,7 @@ executing==2.0.1          # via stack-data
 filelock==3.13.1          # via virtualenv
 flit==3.9.0               # via -r dev-requirements.in
 flit-core==3.9.0          # via flit
-idna==3.5                 # via requests
+idna==3.6                 # via requests
 inform==1.28              # via -c nt2/requirements.txt, -c test/../nt2/requirements.txt, -c test/test-requirements.txt, nestedtext
 ipython==8.18.0           # via -r dev-requirements.in
 isort==5.12.0             # via -c fmt-requirements.txt, -r fmt-requirements.in
diff --git a/doc/doc-requirements.txt b/doc/doc-requirements.txt
index 0e67b83..ff01ae9 100644
--- a/doc/doc-requirements.txt
+++ b/doc/doc-requirements.txt
@@ -11,7 +11,7 @@ docutils==0.20.1          # via pydoctor
 filelock==3.13.1          # via cachecontrol
 fpyutils==4.0.1           # via md-toc
 hyperlink==21.0.0         # via twisted
-idna==3.5                 # via hyperlink, requests
+idna==3.6                 # via hyperlink, requests
 incremental==22.10.0      # via twisted
 lunr==0.6.2               # via pydoctor
 md-toc==8.2.2             # via -r doc-requirements.in