diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+# 0.4.1.0
+
+* Depend on `bluefin-internal >= 0.4.1.0` to pick up `MonadFix`
+  instance for `Eff`
+
 # 0.4.0.1
 
 * Documentation only
diff --git a/bluefin.cabal b/bluefin.cabal
--- a/bluefin.cabal
+++ b/bluefin.cabal
@@ -1,6 +1,6 @@
 cabal-version:      3.0
 name:               bluefin
-version:            0.4.0.1
+version:            0.4.1.0
 license:            MIT
 license-file:       LICENSE
 author:             Tom Ellis
@@ -42,6 +42,6 @@
       Bluefin.System.IO,
       Bluefin.Writer,
     build-depends:
-      bluefin-internal >= 0.4.0.0 && < 0.5
+      bluefin-internal >= 0.4.1.0 && < 0.5
     hs-source-dirs:   src
     default-language: Haskell2010