diff --git a/changelog.d/396.misc b/changelog.d/396.misc
new file mode 100644
index 00000000..0c1aa80d
--- /dev/null
+++ b/changelog.d/396.misc
@@ -0,0 +1 @@
+Pin `aiohttp` dependency to <= 4.0.0.
\ No newline at end of file