diff --git a/rekahsoft-gnu/packages/haskell-apps.scm b/rekahsoft-gnu/packages/haskell-apps.scm
index c3b0b21..11a90f0 100644
--- a/rekahsoft-gnu/packages/haskell-apps.scm
+++ b/rekahsoft-gnu/packages/haskell-apps.scm
@@ -31,6 +31,27 @@
   #:use-module (gnu packages finance)
   #:use-module (rekahsoft-gnu packages haskell-web))
 
+(define-public ghc-bimap
+  (package
+    (name "ghc-bimap")
+    (version "0.5.0")
+    (source (origin
+              (method url-fetch)
+              (uri (hackage-uri "bimap" version))
+              (sha256
+               (base32
+                "158cdwk9jwklcfgbn62dqq255i40w13ifggsdps87sxc5q7lpd5h"))))
+    (build-system haskell-build-system)
+    (native-inputs (list ghc-quickcheck))
+    (inputs (list ghc-exceptions))
+    (home-page "https://github.com/joelwilliamson/bimap")
+    (synopsis "Bidirectional mapping between two key types")
+    (description
+     "This package provides a data structure representing a bidirectional mapping
+between two key types.  Each value in the bimap is associated with exactly one
+value of the opposite type.")
+    (license license:bsd-3)))
+
 (define-public ghc-vty
   (package
     (name "ghc-vty")