diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,14 @@
 # Revision history for effect-stack
 
+## 0.2.1 -- 2019-07-07
+
+* Demand a very new transformers because we import a very new module.
+
+## 0.2 -- 2019-07-07
+
+* Added some type-level hackery to make it more comfortable to use with deep stacks.
+* Added a needed dependency on mtl.
+
 ## 0.1.0.1 -- 2019-07-04
 
 * Removed an unneeded dependency on mtl.
diff --git a/effect-stack.cabal b/effect-stack.cabal
--- a/effect-stack.cabal
+++ b/effect-stack.cabal
@@ -1,5 +1,5 @@
 name:                effect-stack
-version:             0.2
+version:             0.2.1
 synopsis:            Reducing the pain of transformer stacks with duplicated effects
 description:         When using monad transformer stacks, it is common to want
                      to mix effects from various layers of the stack within a
@@ -60,7 +60,7 @@
 category:            Control
 build-type:          Simple
 extra-source-files:  ChangeLog.md
-cabal-version:       >=2.0
+cabal-version:       2.0
 
 source-repository head
   type:     git
@@ -94,6 +94,6 @@
                        base ^>=4.12,
                        constraints ^>=0.11,
                        mtl ^>= 2.2,
-                       transformers ^>=0.5
+                       transformers ^>=0.5.6
   default-language:    Haskell2010
   ghc-options:         -fno-warn-tabs