diff --git a/CHANGES.md b/CHANGES.md
index 58fb9acdd..45d3cdb13 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,13 @@
+Synapse 0.33.5.1 (2018-09-25)
+=============================
+
+Internal Changes
+----------------
+
+- Fix incompatibility with older Twisted version in tests. Thanks 
+  @OlegGirko! ([\#3940](https://github.com/matrix-org/synapse/issues/3940))
+
+
 Synapse 0.33.5 (2018-09-24)
 ===========================
 
diff --git a/changelog.d/3940.misc b/changelog.d/3940.misc
deleted file mode 100644
index a39d2bde3..000000000
--- a/changelog.d/3940.misc
+++ /dev/null
@@ -1,2 +0,0 @@
-Fix incompatibility with older Twisted version in tests. Thanks 
-@OlegGirko!