diff --git a/nested-routes.cabal b/nested-routes.cabal
--- a/nested-routes.cabal
+++ b/nested-routes.cabal
@@ -2,12 +2,12 @@
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: 63050286fd1f0f13f88a2da4e77f8b0f36e66c14d15a14350450ccc8955349e2
+-- hash: 7c520a45928168a93159724ea46821f4fe47ae0e5f9b02998cfa86d1380a1b99
 
 name:           nested-routes
-version:        9.0.1.1
+version:        9.0.2
 synopsis:       Declarative, compositional Wai responses
-description:    Please see the README on Github at <https://git.localcooking.com/tooling/pred-trie#readme>
+description:    Please see the README on Github at <https://github.com/athanclark/nested-routes#readme>
 category:       Web
 homepage:       https://github.com/athanclark/nested-routes#readme
 bug-reports:    https://github.com/athanclark/nested-routes/issues
@@ -33,7 +33,7 @@
   ghc-options: -Wall
   build-depends:
       attoparsec
-    , base >=4.9 && <5
+    , base >=4.11 && <5
     , errors
     , exceptions
     , extractable-singleton
@@ -41,13 +41,13 @@
     , monad-control-aligned
     , mtl
     , poly-arity >=0.0.7
-    , pred-trie >=0.6.0
+    , pred-trie >=0.6.1
     , regex-compat
     , text
-    , tries >=0.0.5
+    , tries >=0.0.6
     , unordered-containers
     , wai >=3.2.1
-    , wai-middleware-content-type >=0.6.1.1
+    , wai-middleware-content-type >=0.6.2
     , wai-middleware-verbs >=0.4.0.1
     , wai-transformers >=0.1.0
   default-language: Haskell2010
@@ -77,15 +77,15 @@
     , mtl
     , nested-routes
     , poly-arity >=0.0.7
-    , pred-trie >=0.6.0
+    , pred-trie >=0.6.1
     , regex-compat
     , tasty
     , tasty-hspec
     , text
-    , tries >=0.0.5
+    , tries >=0.0.6
     , unordered-containers
     , wai >=3.2.1
-    , wai-middleware-content-type >=0.6.1.1
+    , wai-middleware-content-type >=0.6.2
     , wai-middleware-verbs >=0.4.0.1
     , wai-transformers >=0.1.0
   default-language: Haskell2010
diff --git a/src/Web/Routes/Nested/Types.hs b/src/Web/Routes/Nested/Types.hs
--- a/src/Web/Routes/Nested/Types.hs
+++ b/src/Web/Routes/Nested/Types.hs
@@ -56,10 +56,12 @@
   }
 
 
+instance Semigroup (Tries x s) where
+  (Tries x1 x2 x3) <> (Tries y1 y2 y3) =
+    Tries (x1 <> y1) (x2 <> y2) (x3 <> y3)
+
 instance Monoid (Tries x s) where
   mempty = Tries mempty mempty mempty
-  mappend (Tries x1 x2 x3) (Tries y1 y2 y3) =
-    Tries (x1 <> y1) (x2 <> y2) (x3 <> y3)
 
 -- | The (syntactic) monad for building a router with functions like
 --   "Web.Routes.Nested.match".