diff --git a/README.md b/README.md
index e7e20da4..0617028c 100644
--- a/README.md
+++ b/README.md
@@ -168,8 +168,6 @@ We can now expose this service out to the world with the Ingress:
 
 -- Prelude imports
    let map    = https://raw.githubusercontent.com/dhall-lang/Prelude/v2.0.0/List/map
-in let Some   = https://raw.githubusercontent.com/dhall-lang/Prelude/v2.0.0/Optional/Some
-in let None   = https://raw.githubusercontent.com/dhall-lang/Prelude/v2.0.0/Optional/None
 
 -- dhall-kubernetes types and defaults
 in let TLS     = ../types/io.k8s.api.extensions.v1beta1.IngressTLS.dhall
@@ -192,30 +190,30 @@ in let mkIngress : Config -> Ingress =
   \(config : Config) ->
 
   -- Given a service, make a TLS definition with their host and certificate
-     let makeTLS = \(service : Service) ->
-    { hosts = Some (List Text) [ service.host ]
-    , secretName = Some Text "${service.name}-certificate"
-    }
+	 let makeTLS = \(service : Service) ->
+	{ hosts = Some [ service.host ]
+	, secretName = Some "${service.name}-certificate"
+	}
 
   -- Given a service, make an Ingress Rule
   in let makeRule = \(service : Service) ->
-    { host = Some Text service.host
-    , http = Some RuleVal
-      { paths = [ { backend = { serviceName = service.name
-                              , servicePort = IntOrString.Int 80
-                              }
-                  , path = None Text
-                  }
-                ]
-      }
-    }
+	{ host = Some service.host
+	, http = Some
+	  { paths = [ { backend = { serviceName = service.name
+							  , servicePort = IntOrString.Int 80
+							  }
+				  , path = None Text
+				  }
+				]
+	  }
+	}
 
   -- Nginx ingress requires a default service as a catchall
   in let defaultService =
-    { name = "default"
-    , host = "default.example.com"
-    , version = " 1.0"
-    }
+	{ name = "default"
+	, host = "default.example.com"
+	, version = " 1.0"
+	}
 
   -- List of services
   in let services = config.services # [ defaultService ]
@@ -226,23 +224,23 @@ in let mkIngress : Config -> Ingress =
   in let genericRecord = List { mapKey : Text, mapValue : Text }
   in let kv = \(k : Text) -> \(v : Text) -> { mapKey = k, mapValue = v }
 
-  in let annotations = Some genericRecord
-    [ kv "kubernetes.io/ingress.class"      "nginx"
-    , kv "kubernetes.io/ingress.allow-http" "false"
-    ]
+  in let annotations = Some
+	[ kv "kubernetes.io/ingress.class"      "nginx"
+	, kv "kubernetes.io/ingress.allow-http" "false"
+	]
 
   -- Generate spec from services
   in let spec = defaultSpec //
-    { tls   = Some (List TLS)  (map Service TLS  makeTLS  services)
-    , rules = Some (List Rule) (map Service Rule makeRule services)
-    }
+	{ tls   = Some (map Service TLS  makeTLS  services)
+	, rules = Some (map Service Rule makeRule services)
+	}
 
   in defaultIngress
-    { metadata = defaultMeta
-      { name = "nginx" } //
-      { annotations = annotations }
-    } //
-    { spec = Some Spec spec }
+	{ metadata = defaultMeta
+	  { name = "nginx" } //
+	  { annotations = annotations }
+	} //
+	{ spec = Some spec }
 
 
 -- Here we import our example service, and generate the ingress with it
diff --git a/api/Deployment/mkDeployment b/api/Deployment/mkDeployment
index f0e6a6ed..2623a4d8 100644
--- a/api/Deployment/mkDeployment
+++ b/api/Deployment/mkDeployment
@@ -1,8 +1,6 @@
 -- Prelude
-   let Prelude = https://raw.githubusercontent.com/dhall-lang/Prelude/v2.0.0/package.dhall
+   let Prelude = https://raw.githubusercontent.com/dhall-lang/Prelude/v3.0.0/package.dhall
 in let map  = Prelude.`List`.map
-in let Some = Prelude.`Optional`.Some
-in let None = Prelude.`Optional`.None
 in let kv   = Prelude.JSON.keyText
 
 -- Kubernetes types and defaults
@@ -18,14 +16,14 @@ in let mkProbe : ./Probe → Optional Types.Probe =
 
   λ(probe : ./Probe) →
 
-  Some Types.Probe
+  Some
     (default.probe //
-      { initialDelaySeconds = Some Natural probe.initial
-      , periodSeconds = Some Natural probe.period
-      , httpGet = Some Types.HttpGet
+      { initialDelaySeconds = Some probe.initial
+      , periodSeconds = Some probe.period
+      , httpGet = Some
         (default.httpGet
             { port = default.Int probe.port } //
-            { path = Some Text probe.path
+            { path = Some probe.path
             })
       })
 
@@ -36,7 +34,7 @@ in let mkEnvVar : KV → Types.EnvVar =
 
   default.envVar
     { name  = var.mapKey } //
-    { value = Some Text var.mapValue }
+    { value = Some var.mapValue }
 
 
 in let mkEmptyVolume : { name : Text } → Types.Volume =
@@ -45,7 +43,7 @@ in let mkEmptyVolume : { name : Text } → Types.Volume =
 
   default.volume
     { name = vol.name } //
-    { emptyDir = Some Types.EmptyVolume default.emptyVolume }
+    { emptyDir = Some default.emptyVolume }
 
 
 in let mkSecretVolume : { name : Text } → Types.Volume =
@@ -54,8 +52,8 @@ in let mkSecretVolume : { name : Text } → Types.Volume =
 
   default.volume
     { name = vol.name } //
-    { secret = Some Types.SecretVolume
-        (default.secretVolume // { secretName = Some Text vol.name } )
+    { secret = Some
+        (default.secretVolume // { secretName = Some vol.name } )
     }
 
 
@@ -65,7 +63,7 @@ in let mkPathVolume : { name : Text, path : Text } → Types.Volume =
 
   default.volume
     { name = vol.name } //
-    { hostPath = Some Types.PathVolume
+    { hostPath = Some
         (default.pathVolume { path = vol.path })
     }
 
@@ -87,21 +85,21 @@ in let mkContainer : ./Container → Types.Container =
 
   default.container
     { name = container.name } //
-    { image = Some Text "${container.imageName}:${container.imageTag}"
-    , imagePullPolicy = Some Text container.imagePullPolicy
+    { image = Some "${container.imageName}:${container.imageTag}"
+    , imagePullPolicy = Some container.imagePullPolicy
     , ports = Optional/fold
         Natural
         container.port
         (Optional (List Types.ContainerPort))
-        (λ(port : Natural) → Some (List Types.ContainerPort)
+        (λ(port : Natural) → Some
           [(default.containerPort { containerPort = port })])
         (None (List Types.ContainerPort))
-    , resources = Some Types.Resources
-      { limits   = Some ListKV [kv "cpu" "${Natural/show container.maxCPU}m"]
-      , requests = Some ListKV [kv "cpu" "${Natural/show container.minCPU}m"]
+    , resources = Some
+      { limits   = Some [kv "cpu" "${Natural/show container.maxCPU}m"]
+      , requests = Some [kv "cpu" "${Natural/show container.minCPU}m"]
       }
     , command = container.command
-    , volumeMounts = Some (List Types.Mount)
+    , volumeMounts = Some
         (map ./Mount Types.Mount mkMount container.mounts)
     -- Poll the container to see if the it's alive or we should restart it
     , livenessProbe = Optional/fold
@@ -117,7 +115,7 @@ in let mkContainer : ./Container → Types.Container =
         (Optional Types.Probe)
         mkProbe
         (None Types.Probe)
-    , env = Some (List Types.EnvVar)
+    , env = Some
         (map { mapKey : Text , mapValue : Text } Types.EnvVar mkEnvVar container.envVars)
     }
 
@@ -126,12 +124,12 @@ in let mkDeployment : ./Deployment → Types.Deployment =
 
   λ(deployment : ./Deployment) →
 
-     let selector = Some ListKV [kv "app" deployment.name]
+     let selector = Some [kv "app" deployment.name]
 
   in let emptyVolumes = map { name : Text } Types.Volume mkEmptyVolume deployment.emptyVolumes
   in let secretVolumes = map { name : Text } Types.Volume mkSecretVolume deployment.secretVolumes
   in let pathVolumes = map { name : Text, path : Text } Types.Volume mkPathVolume deployment.pathVolumes
-  in let volumes = Some (List Types.Volume) (emptyVolumes # secretVolumes # pathVolumes)
+  in let volumes = Some (emptyVolumes # secretVolumes # pathVolumes)
 
   in let spec = default.spec
   { selector = default.selector // { matchLabels = selector }
@@ -139,23 +137,23 @@ in let mkDeployment : ./Deployment → Types.Deployment =
     { metadata = default.meta
       { name = deployment.name } // { labels = selector }
     } //
-    { spec = Some Types.PodSpec (default.podSpec
+    { spec = Some (default.podSpec
       { containers = map ./Container Types.Container mkContainer deployment.containers
       } //
       { volumes = volumes
       })
     }
   } //
-  { replicas = Some Natural deployment.replicas
+  { replicas = Some deployment.replicas
   -- Don't keep all the ReplicaSets
-  , revisionHistoryLimit = Some Natural deployment.revisionHistoryLimit
-  , strategy = Some Types.Strategy
+  , revisionHistoryLimit = Some deployment.revisionHistoryLimit
+  , strategy = Some
     -- Control the RollingUpdate so the app is always available. For more info see:
     -- https://kubernetes.io/docs/concepts/workloads/controllers/deployment/
-    { type = Some Text "RollingUpdate"
-    , rollingUpdate = Some Types.RollingUpdate
-      { maxSurge       = Some Types.IntOrString (default.Int deployment.maxSurge)
-      , maxUnavailable = Some Types.IntOrString (default.Int deployment.maxUnavailable)
+    { type = Some "RollingUpdate"
+    , rollingUpdate = Some
+      { maxSurge       = Some (default.Int deployment.maxSurge)
+      , maxUnavailable = Some (default.Int deployment.maxUnavailable)
       }
     }
   }
@@ -163,7 +161,7 @@ in let mkDeployment : ./Deployment → Types.Deployment =
   in default.deployment
   { metadata = default.meta { name = deployment.name }
   } //
-  { spec = Some Types.Spec spec
+  { spec = Some spec
   }
 
 
diff --git a/api/Service/mkService b/api/Service/mkService
index 329a8817..e98bf57d 100644
--- a/api/Service/mkService
+++ b/api/Service/mkService
@@ -1,6 +1,5 @@
 -- Prelude
-   let Prelude = https://raw.githubusercontent.com/dhall-lang/Prelude/v2.0.0/package.dhall
-in let Some = Prelude.`Optional`.Some
+   let Prelude = https://raw.githubusercontent.com/dhall-lang/Prelude/v3.0.0/package.dhall
 in let kv   = Prelude.JSON.keyText
 
 -- Kubernetes types and defaults
@@ -16,12 +15,12 @@ in let mkService : ./Service → Types.Service =
 
   λ(service : ./Service) →
 
-     let selector = Some ListKV [kv "app" service.name]
+     let selector = Some [kv "app" service.name]
 
   in let meta = default.meta
   { name = service.name } //
   { labels = selector
-  , annotations = Some ListKV service.annotations
+  , annotations = Some service.annotations
   }
 
   -- Handlers for the ServiceType union
@@ -33,11 +32,11 @@ in let mkService : ./Service → Types.Service =
     }
 
   in let spec = default.spec //
-  { type = Some Text (merge handlers service.type : Text)
-  , ports = Some (List Types.Port)
+  { type = Some (merge handlers service.type : Text)
+  , ports = Some
     [ default.port
       { port = service.outPort } //
-      { targetPort = Some Types.IntOrString (default.Int service.containerPort) }
+      { targetPort = Some (default.Int service.containerPort) }
     ]
   , selector = selector
   }
@@ -45,7 +44,7 @@ in let mkService : ./Service → Types.Service =
   in default.service
   { metadata = meta
   } //
-  { spec = Some Types.Spec spec
+  { spec = Some spec
   } : Types.Service
 
 in mkService
diff --git a/examples/deploymentRaw.dhall b/examples/deploymentRaw.dhall
index 30b14520..b73f0248 100644
--- a/examples/deploymentRaw.dhall
+++ b/examples/deploymentRaw.dhall
@@ -1,7 +1,5 @@
 -- Prelude imports
    let map    = https://raw.githubusercontent.com/dhall-lang/Prelude/e44284bc37a5808861dacd4c8bd13d18411cb961/List/map
-in let Some   = https://raw.githubusercontent.com/dhall-lang/Prelude/c79c2bc3c46f129cc5b6d594ce298a381bcae92c/Optional/Some
-in let None   = https://raw.githubusercontent.com/dhall-lang/Prelude/c79c2bc3c46f129cc5b6d594ce298a381bcae92c/Optional/None
 
 -- import dhall-kubernetes types and defaults
 in let Deployment    = ../types/io.k8s.api.apps.v1beta2.Deployment.dhall
@@ -32,36 +30,34 @@ in let mkDeployment : Config -> Deployment =
 
   \(deployment : Config) ->
 
-     let selector = Some (List { mapKey : Text, mapValue : Text })
-                      [{ mapKey = "app", mapValue = deployment.name }]
+	 let selector = Some [{ mapKey = "app", mapValue = deployment.name }]
 
   in let spec = defaultSpec
-    { selector = defaultSelector // { matchLabels = selector }
-    , template = defaultTemplate
-      { metadata = defaultMeta
-        { name = deployment.name } // { labels = selector }
-      } //
-      { spec = Some PodSpec (defaultPodSpec
-        { containers = [
-          defaultContainer
-            { name = deployment.name } //
-            { image = Some Text "your-container-service.io/${deployment.name}:${deployment.version}"
-            , imagePullPolicy = Some Text "Always"
-            , ports = Some (List ContainerPort)
-                [(defaultContainerPort {containerPort = 8080})]
-            }
-          ]
-        })
-      }
-    } //
-    { replicas = Some Natural 2
-    , revisionHistoryLimit = Some Natural 10
-    }
+	{ selector = defaultSelector // { matchLabels = selector }
+	, template = defaultTemplate
+	  { metadata = defaultMeta
+		{ name = deployment.name } // { labels = selector }
+	  } //
+	  { spec = Some (defaultPodSpec
+		{ containers = [
+		  defaultContainer
+			{ name = deployment.name } //
+			{ image = Some "your-container-service.io/${deployment.name}:${deployment.version}"
+			, imagePullPolicy = Some "Always"
+			, ports = Some [(defaultContainerPort {containerPort = 8080})]
+			}
+		  ]
+		})
+	  }
+	} //
+	{ replicas = Some 2
+	, revisionHistoryLimit = Some 10
+	}
 
   in defaultDeployment
-    { metadata = defaultMeta { name = deployment.name }
-    } //
-    { spec = Some Spec spec } : Deployment
+	{ metadata = defaultMeta { name = deployment.name }
+	} //
+	{ spec = Some spec } : Deployment
 
 
 {-
diff --git a/examples/ingressRaw.dhall b/examples/ingressRaw.dhall
index 1d112de4..9d6daed8 100644
--- a/examples/ingressRaw.dhall
+++ b/examples/ingressRaw.dhall
@@ -1,7 +1,5 @@
 -- Prelude imports
    let map    = https://raw.githubusercontent.com/dhall-lang/Prelude/v2.0.0/List/map
-in let Some   = https://raw.githubusercontent.com/dhall-lang/Prelude/v2.0.0/Optional/Some
-in let None   = https://raw.githubusercontent.com/dhall-lang/Prelude/v2.0.0/Optional/None
 
 -- dhall-kubernetes types and defaults
 in let TLS     = ../types/io.k8s.api.extensions.v1beta1.IngressTLS.dhall
@@ -24,30 +22,30 @@ in let mkIngress : Config -> Ingress =
   \(config : Config) ->
 
   -- Given a service, make a TLS definition with their host and certificate
-     let makeTLS = \(service : Service) ->
-    { hosts = Some (List Text) [ service.host ]
-    , secretName = Some Text "${service.name}-certificate"
-    }
+	 let makeTLS = \(service : Service) ->
+	{ hosts = Some [ service.host ]
+	, secretName = Some "${service.name}-certificate"
+	}
 
   -- Given a service, make an Ingress Rule
   in let makeRule = \(service : Service) ->
-    { host = Some Text service.host
-    , http = Some RuleVal
-      { paths = [ { backend = { serviceName = service.name
-                              , servicePort = IntOrString.Int 80
-                              }
-                  , path = None Text
-                  }
-                ]
-      }
-    }
+	{ host = Some service.host
+	, http = Some
+	  { paths = [ { backend = { serviceName = service.name
+							  , servicePort = IntOrString.Int 80
+							  }
+				  , path = None Text
+				  }
+				]
+	  }
+	}
 
   -- Nginx ingress requires a default service as a catchall
   in let defaultService =
-    { name = "default"
-    , host = "default.example.com"
-    , version = " 1.0"
-    }
+	{ name = "default"
+	, host = "default.example.com"
+	, version = " 1.0"
+	}
 
   -- List of services
   in let services = config.services # [ defaultService ]
@@ -58,23 +56,23 @@ in let mkIngress : Config -> Ingress =
   in let genericRecord = List { mapKey : Text, mapValue : Text }
   in let kv = \(k : Text) -> \(v : Text) -> { mapKey = k, mapValue = v }
 
-  in let annotations = Some genericRecord
-    [ kv "kubernetes.io/ingress.class"      "nginx"
-    , kv "kubernetes.io/ingress.allow-http" "false"
-    ]
+  in let annotations = Some
+	[ kv "kubernetes.io/ingress.class"      "nginx"
+	, kv "kubernetes.io/ingress.allow-http" "false"
+	]
 
   -- Generate spec from services
   in let spec = defaultSpec //
-    { tls   = Some (List TLS)  (map Service TLS  makeTLS  services)
-    , rules = Some (List Rule) (map Service Rule makeRule services)
-    }
+	{ tls   = Some (map Service TLS  makeTLS  services)
+	, rules = Some (map Service Rule makeRule services)
+	}
 
   in defaultIngress
-    { metadata = defaultMeta
-      { name = "nginx" } //
-      { annotations = annotations }
-    } //
-    { spec = Some Spec spec }
+	{ metadata = defaultMeta
+	  { name = "nginx" } //
+	  { annotations = annotations }
+	} //
+	{ spec = Some spec }
 
 
 -- Here we import our example service, and generate the ingress with it
diff --git a/nix/dhall-1.18.0.nix b/nix/dhall-1.18.0.nix
new file mode 100644
index 00000000..b8abe2f6
--- /dev/null
+++ b/nix/dhall-1.18.0.nix
@@ -0,0 +1,36 @@
+{ mkDerivation, ansi-terminal, base, bytestring, case-insensitive
+, cborg, containers, contravariant, criterion, cryptonite, deepseq
+, Diff, directory, doctest, exceptions, filepath, haskeline
+, http-client, http-client-tls, lens-family-core, megaparsec
+, memory, mockery, mtl, optparse-applicative, parsers
+, prettyprinter, prettyprinter-ansi-terminal, QuickCheck
+, quickcheck-instances, repline, scientific, serialise, stdenv
+, tasty, tasty-hunit, tasty-quickcheck, template-haskell, text
+, transformers, unordered-containers, vector
+}:
+mkDerivation {
+  pname = "dhall";
+  version = "1.18.0";
+  sha256 = "b528ecff4f757fa085f61636ffb8a6eb90c761106d7d20bd735bee48a6abab94";
+  isLibrary = true;
+  isExecutable = true;
+  libraryHaskellDepends = [
+    ansi-terminal base bytestring case-insensitive cborg containers
+    contravariant cryptonite Diff directory exceptions filepath
+    haskeline http-client http-client-tls lens-family-core megaparsec
+    memory mtl optparse-applicative parsers prettyprinter
+    prettyprinter-ansi-terminal repline scientific serialise
+    template-haskell text transformers unordered-containers vector
+  ];
+  executableHaskellDepends = [ base ];
+  testHaskellDepends = [
+    base containers deepseq directory doctest filepath mockery
+    prettyprinter QuickCheck quickcheck-instances serialise tasty
+    tasty-hunit tasty-quickcheck text transformers vector
+  ];
+  benchmarkHaskellDepends = [
+    base bytestring containers criterion directory serialise text
+  ];
+  description = "A configuration language guaranteed to terminate";
+  license = stdenv.lib.licenses.bsd3;
+}
diff --git a/nix/dhall-json-1.2.4.nix b/nix/dhall-json-1.2.4.nix
new file mode 100644
index 00000000..2bcc2260
--- /dev/null
+++ b/nix/dhall-json-1.2.4.nix
@@ -0,0 +1,23 @@
+{ mkDerivation, aeson, aeson-pretty, base, bytestring, dhall
+, optparse-applicative, stdenv, tasty, tasty-hunit, text
+, unordered-containers, vector, yaml
+}:
+mkDerivation {
+  pname = "dhall-json";
+  version = "1.2.4";
+  sha256 = "e594b47a168c47225d929d94c8dce12b9b32a195c9faa02ff091b3f18adb63e7";
+  isLibrary = true;
+  isExecutable = true;
+  libraryHaskellDepends = [
+    aeson base dhall optparse-applicative text unordered-containers
+  ];
+  executableHaskellDepends = [
+    aeson aeson-pretty base bytestring dhall optparse-applicative text
+    vector yaml
+  ];
+  testHaskellDepends = [
+    aeson base bytestring dhall tasty tasty-hunit text
+  ];
+  description = "Compile Dhall to JSON or YAML";
+  license = stdenv.lib.licenses.bsd3;
+}
diff --git a/nix/megaparsec-7.0.2.nix b/nix/megaparsec-7.0.2.nix
new file mode 100644
index 00000000..f584b56f
--- /dev/null
+++ b/nix/megaparsec-7.0.2.nix
@@ -0,0 +1,25 @@
+{ mkDerivation, base, bytestring, case-insensitive, containers
+, criterion, deepseq, hspec, hspec-expectations, mtl
+, parser-combinators, QuickCheck, scientific, stdenv, text
+, transformers, weigh
+}:
+mkDerivation {
+  pname = "megaparsec";
+  version = "7.0.2";
+  sha256 = "e888f6a1ef6c9908c9893f2cd4105d12d7778cf88f885b416915fcd89526c5db";
+  libraryHaskellDepends = [
+    base bytestring case-insensitive containers deepseq mtl
+    parser-combinators scientific text transformers
+  ];
+  testHaskellDepends = [
+    base bytestring case-insensitive containers hspec
+    hspec-expectations mtl parser-combinators QuickCheck scientific
+    text transformers
+  ];
+  benchmarkHaskellDepends = [
+    base containers criterion deepseq text weigh
+  ];
+  homepage = "https://github.com/mrkkrp/megaparsec";
+  description = "Monadic parser combinators";
+  license = stdenv.lib.licenses.bsd2;
+}
diff --git a/nix/repline-0.2.0.0.nix b/nix/repline-0.2.0.0.nix
new file mode 100644
index 00000000..e9fa564e
--- /dev/null
+++ b/nix/repline-0.2.0.0.nix
@@ -0,0 +1,11 @@
+{ mkDerivation, base, containers, haskeline, mtl, process, stdenv
+}:
+mkDerivation {
+  pname = "repline";
+  version = "0.2.0.0";
+  sha256 = "ecc72092d0340b896ee6bf96bf6645694dbcd33361725a2cd28c5ab5d60c02de";
+  libraryHaskellDepends = [ base containers haskeline mtl process ];
+  homepage = "https://github.com/sdiehl/repline";
+  description = "Haskeline wrapper for GHCi-like REPL interfaces";
+  license = stdenv.lib.licenses.mit;
+}
diff --git a/nixpkgs.nix b/nixpkgs.nix
index 746f7528..15e84431 100644
--- a/nixpkgs.nix
+++ b/nixpkgs.nix
@@ -1,10 +1,23 @@
 let
-  rev = "c5f9cd4cde81bcef2c8882d359d9d30313bebeb3";
-  outputSha256 = "1nilhz6rhfg3ckp8yfmgy6v3q6spbyxfg0yn8rc2ydyn7119h4fn";
+  rev = "19013d809297cb9dbba69bda24e52a2833f4e05a";
+  outputSha256 = "148nqqyb39xmxlnw4vgqin2s7ywq51yi64d2hqmd6pk2gqnhmpv9";
 
   nixpkgs = builtins.fetchTarball {
     url = "https://github.com/NixOS/nixpkgs/archive/${rev}.tar.gz";
     sha256 = outputSha256;
   };
+
+  config = {
+    packageOverrides = pkgs: rec {
+      haskellPackages = pkgs.haskellPackages.override {
+        overrides = haskellPackagesNew: haskellPackagesOld: rec {
+          dhall = haskellPackagesNew.callPackage ./nix/dhall-1.18.0.nix {};
+          dhall-json = haskellPackagesNew.callPackage ./nix/dhall-json-1.2.4.nix {};
+          megaparsec = haskellPackagesNew.callPackage ./nix/megaparsec-7.0.2.nix {};
+          repline = haskellPackagesNew.callPackage ./nix/repline-0.2.0.0.nix {};
+        };
+      };
+    };
+  };
 in
-  import nixpkgs {}
+  import nixpkgs { inherit config; }