diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## version 0
 
+### 0.2.1 -- 2023-10-09
+
+* Expose the functions `unbind2` and `unbind2List`.
+
 ### 0.2 -- 2023-10-06
 
 * Add operations for list.
diff --git a/binder.cabal b/binder.cabal
--- a/binder.cabal
+++ b/binder.cabal
@@ -1,6 +1,6 @@
 cabal-version:      3.0
 name:               binder
-version:            0.2
+version:            0.2.1
 synopsis:           Variable binding for abstract syntax tree
 description:
     binder is purely functional implementation of Ocaml's
@@ -29,7 +29,7 @@
 source-repository this
     type:     git
     location: https://github.com/ijaketak/binder
-    tag:      0.2
+    tag:      v0.2.1
 
 common depends
     build-depends:
diff --git a/src/Data/Binder.hs b/src/Data/Binder.hs
--- a/src/Data/Binder.hs
+++ b/src/Data/Binder.hs
@@ -56,6 +56,7 @@
   , buildBinder
   , bind
   , unbind
+  , unbind2
   , eqBinder
   , boxBinder
   , bindApply
@@ -78,6 +79,7 @@
   , eqBinderList
   , bindList
   , unbindList
+  , unbind2List
   , boxBinderList
   , bindListApply
   ) where