diff --git a/nri-test-encoding/nri-test-encoding.cabal b/nri-test-encoding/nri-test-encoding.cabal
index 57ca15b9..62cd74c3 100644
--- a/nri-test-encoding/nri-test-encoding.cabal
+++ b/nri-test-encoding/nri-test-encoding.cabal
@@ -60,9 +60,9 @@ library
     , filepath >=1.4.2.1 && <1.5
     , nri-prelude >=0.1.0.0 && <0.7
     , nri-redis >=0.1.0.0 && <0.4
-    , servant >=0.16.2 && <0.21
-    , servant-auth-server >=0.4.5.1 && <0.5
-    , servant-server >=0.16.2 && <0.21
+    , servant >=0.20.2 && <0.21
+    , servant-auth-server >=0.4.9.0 && <0.5
+    , servant-server >=0.20.2 && <0.21
     , text >=1.2.3.1 && <2.2
   default-language: Haskell2010
 
@@ -101,8 +101,8 @@ test-suite tests
     , filepath >=1.4.2.1 && <1.5
     , nri-prelude >=0.1.0.0 && <0.7
     , nri-redis >=0.1.0.0 && <0.4
-    , servant >=0.16.2 && <0.21
-    , servant-auth-server >=0.4.5.1 && <0.5
-    , servant-server >=0.16.2 && <0.21
+    , servant >=0.20.2 && <0.21
+    , servant-auth-server >=0.4.9.0 && <0.5
+    , servant-server >=0.20.2 && <0.21
     , text >=1.2.3.1 && <2.2
   default-language: Haskell2010
diff --git a/nri-test-encoding/package.yaml b/nri-test-encoding/package.yaml
index c49e5157..23f73507 100644
--- a/nri-test-encoding/package.yaml
+++ b/nri-test-encoding/package.yaml
@@ -19,9 +19,9 @@ dependencies:
   - base >= 4.17 && < 4.20
   - bytestring >= 0.10.8.2 && < 0.13
   - filepath >= 1.4.2.1 && < 1.5
-  - servant >= 0.16.2 && < 0.21
-  - servant-auth-server >= 0.4.5.1 && < 0.5
-  - servant-server >= 0.16.2 && < 0.21
+  - servant >= 0.20.2 && < 0.21
+  - servant-auth-server >= 0.4.9.0 && < 0.5
+  - servant-server >= 0.20.2 && < 0.21
   - text >= 1.2.3.1 && < 2.2
   - nri-prelude >= 0.1.0.0 && < 0.7
   - nri-redis >= 0.1.0.0 && < 0.4
diff --git a/nri-test-encoding/src/Test/Encoding/Routes.hs b/nri-test-encoding/src/Test/Encoding/Routes.hs
index aa502859..ce33fe9b 100644
--- a/nri-test-encoding/src/Test/Encoding/Routes.hs
+++ b/nri-test-encoding/src/Test/Encoding/Routes.hs
@@ -1,6 +1,7 @@
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE PolyKinds #-}
 {-# LANGUAGE RankNTypes #-}
+{-# LANGUAGE UndecidableInstances #-}
 {-# OPTIONS_GHC -fno-warn-orphans #-}
 
 -- | Test helpers to ensure we don't change types or encodings of types
@@ -27,6 +28,7 @@ import qualified Servant
 import Servant.API
   ( Capture',
     Header',
+    NamedRoutes,
     QueryFlag,
     QueryParam',
     QueryParams,
@@ -207,6 +209,9 @@ class IsApi a where
 instance (IsApi a, IsApi b) => IsApi (a :<|> b) where
   crawl _ = crawl (Proxy :: Proxy a) ++ crawl (Proxy :: Proxy b)
 
+instance (IsApi (ToServantApi a)) => IsApi (NamedRoutes a) where
+  crawl _ = crawl (Proxy :: Proxy (ToServantApi a))
+
 instance (KnownSymbol s, IsApi a) => IsApi (s :> a) where
   crawl _ =
     crawl (Proxy :: Proxy a)
diff --git a/nri-test-encoding/test/Main.hs b/nri-test-encoding/test/Main.hs
index e2bf0ea6..6fab2da7 100644
--- a/nri-test-encoding/test/Main.hs
+++ b/nri-test-encoding/test/Main.hs
@@ -1,3 +1,5 @@
+{-# LANGUAGE DuplicateRecordFields #-}
+
 module Main (main) where
 
 import Data.Aeson
@@ -54,16 +56,68 @@ instance HasExamples Bar where
           description = "description"
         }
 
+data Baz = Baz
+  { title :: Text,
+    description :: Text
+  }
+  deriving (Generic)
+
+instance ToJSON Baz
+
+instance HasExamples Baz where
+  examples _ =
+    example
+      "Baz"
+      Baz
+        { title = "title",
+          description = "description"
+        }
+
+data Qux = Qux
+  { title :: Text,
+    description :: Text
+  }
+  deriving (Generic)
+
+instance ToJSON Qux
+
+instance HasExamples Qux where
+  examples _ =
+    example
+      "Qux"
+      Qux
+        { title = "title",
+          description = "description"
+        }
+
 data Routes route = Routes
   { foo ::
       route
         :- "foos"
-          :> Capture ":id" Int
+          :> Capture "id" Int
           :> Get '[JSON] Foo,
     bars ::
       route
         :- "bars"
-          :> Get '[JSON] [Bar]
+          :> Get '[JSON] [Bar],
+    baz :: route :- NamedRoutes BazRoutes
+  }
+  deriving (Generic)
+
+data BazRoutes route = BazRoutes
+  { baz ::
+      route
+        :- "baz"
+          :> Get '[JSON] Baz,
+    qux :: route :- "quxs" :> Capture "id" Int :> NamedRoutes QuxRoutes
+  }
+  deriving (Generic)
+
+newtype QuxRoutes route = QuxRoutes
+  { qux ::
+      route
+        :- "details"
+          :> Get '[JSON] Qux
   }
   deriving (Generic)
 
diff --git a/nri-test-encoding/test/golden-results/'GET-baz.json b/nri-test-encoding/test/golden-results/'GET-baz.json
new file mode 100644
index 00000000..9c0ab323
--- /dev/null
+++ b/nri-test-encoding/test/golden-results/'GET-baz.json
@@ -0,0 +1,5 @@
+Baz
+{
+    "description": "description",
+    "title": "title"
+}
\ No newline at end of file
diff --git a/nri-test-encoding/test/golden-results/'GET-foos-::id.json b/nri-test-encoding/test/golden-results/'GET-foos-:id.json
similarity index 100%
rename from nri-test-encoding/test/golden-results/'GET-foos-::id.json
rename to nri-test-encoding/test/golden-results/'GET-foos-:id.json
diff --git a/nri-test-encoding/test/golden-results/'GET-quxs-:id-details.json b/nri-test-encoding/test/golden-results/'GET-quxs-:id-details.json
new file mode 100644
index 00000000..6acd7f1e
--- /dev/null
+++ b/nri-test-encoding/test/golden-results/'GET-quxs-:id-details.json
@@ -0,0 +1,5 @@
+Qux
+{
+    "description": "description",
+    "title": "title"
+}
\ No newline at end of file
diff --git a/nri-test-encoding/test/golden-results/route-types.json b/nri-test-encoding/test/golden-results/route-types.json
index 705ab51c..80b3890f 100644
--- a/nri-test-encoding/test/golden-results/route-types.json
+++ b/nri-test-encoding/test/golden-results/route-types.json
@@ -1,2 +1,4 @@
 'GET bars response [ Bar ]
-'GET foos/::id response Foo
\ No newline at end of file
+'GET baz response Baz
+'GET foos/:id response Foo
+'GET quxs/:id/details response Qux
\ No newline at end of file