diff --git a/yesod-core/ChangeLog.md b/yesod-core/ChangeLog.md
index 14efa3e5..fbb4c521 100644
--- a/yesod-core/ChangeLog.md
+++ b/yesod-core/ChangeLog.md
@@ -1,5 +1,9 @@
 # ChangeLog for yesod-core
 
+## 1.6.18.4
+
+* Fixed a bug where `mkYesod` and other TH functions didn't work for datatypes with explicitly stated type variables, including the case with typeclass constraints. [https://github.com/yesodweb/yesod/pull/1697](#1697)
+
 ## 1.6.18.3
 
 * Remove mention of an oudated Yesod type (`GHandler`) from the docs for `handlerToIO`. [https://github.com/yesodweb/yesod/pull/1695](#1695)
diff --git a/yesod-core/yesod-core.cabal b/yesod-core/yesod-core.cabal
index 016be94b..dc5cf227 100644
--- a/yesod-core/yesod-core.cabal
+++ b/yesod-core/yesod-core.cabal
@@ -1,5 +1,5 @@
 name:            yesod-core
-version:         1.6.18.3
+version:         1.6.18.4
 license:         MIT
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>