diff --git a/doc/_templates/indexsidebar.html b/doc/_templates/indexsidebar.html
index 94174ce90..55e3f9f40 100644
--- a/doc/_templates/indexsidebar.html
+++ b/doc/_templates/indexsidebar.html
@@ -18,6 +18,6 @@
   <input type="submit" name="sub" value="Subscribe" />
 </form>
 </div>
-<p>{%trans%}or come to the <tt>#sphinx-doc</tt> channel on FreeNode.{%endtrans%}</p>
+<p>{%trans%}or come to the <tt>#sphinx-doc</tt> channel on <a href="https://web.libera.chat/?channel=#sphinx-doc">libera.chat</a>.{%endtrans%}</p>
 <p>{%trans%}You can also open an issue at the
   <a href="https://github.com/sphinx-doc/sphinx/issues">tracker</a>.{%endtrans%}</p>
diff --git a/doc/internals/contributing.rst b/doc/internals/contributing.rst
index 6977614cd..8c74d1b10 100644
--- a/doc/internals/contributing.rst
+++ b/doc/internals/contributing.rst
@@ -21,7 +21,7 @@ sphinx-users <sphinx-users@googlegroups.com>
 sphinx-dev <sphinx-dev@googlegroups.com>
     Mailing list for development related discussions.
 
-#sphinx-doc on irc.freenode.net
+#sphinx-doc on irc.libera.chat
     IRC channel for development questions and user support.
 
 .. _python-sphinx: https://stackoverflow.com/questions/tagged/python-sphinx