diff --git a/qutebrowser/misc/earlyinit.py b/qutebrowser/misc/earlyinit.py
index 60d2c7c09..d1f1669a8 100644
--- a/qutebrowser/misc/earlyinit.py
+++ b/qutebrowser/misc/earlyinit.py
@@ -23,6 +23,7 @@ import datetime
 from typing import NoReturn
 try:
     import tkinter
+    import tkinter.messagebox
 except ImportError:
     tkinter = None  # type: ignore[assignment]
 
diff --git a/scripts/dev/changelog_urls.json b/scripts/dev/changelog_urls.json
index 7c1ba32d9..9a9fe7269 100644
--- a/scripts/dev/changelog_urls.json
+++ b/scripts/dev/changelog_urls.json
@@ -23,6 +23,7 @@
   "Mako": "https://docs.makotemplates.org/en/latest/changelog.html",
   "hypothesis": "https://hypothesis.readthedocs.io/en/latest/changes.html",
   "mypy": "https://github.com/python/mypy/blob/master/CHANGELOG.md",
+  "librt": "https://github.com/mypyc/librt/commits/master/",
   "types-PyYAML": "https://github.com/python/typeshed/commits/main/stubs/PyYAML",
   "types-colorama": "https://github.com/python/typeshed/commits/main/stubs/colorama",
   "types-docutils": "https://github.com/python/typeshed/commits/main/stubs/docutils",