diff --git a/changelog.d/3940.misc b/changelog.d/3940.misc
new file mode 100644
index 0000000000..a39d2bde3e
--- /dev/null
+++ b/changelog.d/3940.misc
@@ -0,0 +1,2 @@
+Fix incompatibility with older Twisted version in tests. Thanks 
+@OlegGirko!