diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # hinit
 
+## 0.2.1
+
+* Switch to optics-core
+* Various changes to the bundled haskell template
+* Use the `unsafeRender` function provided by spdx-license
+
 ## 0.2.0 (2020-12-24)
 
 * Add nix flake to the bundled haskell template
diff --git a/data/templates/haskell/flake.nix b/data/templates/haskell/flake.nix
new file mode 100644
--- /dev/null
+++ b/data/templates/haskell/flake.nix
@@ -0,0 +1,31 @@
+{
+  inputs.nixpkgs.url = github:NixOS/nixpkgs/nixos-unstable;
+  inputs.flake-utils.url = github:poscat0x04/flake-utils;
+
+  outputs = { self, nixpkgs, flake-utils, ... }: with flake-utils;
+    eachDefaultSystem (
+      system:
+        let
+          pkgs = import nixpkgs { inherit system; overlays = [ self.overlay ]; };
+        in
+          with pkgs;
+          {
+            devShell = {{ project }}-dev.envFunc { withHoogle = true; };
+            defaultPackage = {{ project }};
+          }
+    ) // {
+      overlay = self: super:
+        let
+          hpkgs = super.haskellPackages;
+          {{ project }} = hpkgs.callCabal2nix "{{ project }}" ./. {};
+        in
+          with super; with haskell.lib;
+          {
+            inherit {{ project }};
+            {{ project }}-dev = addBuildTools {{ project }} [
+              haskell-language-server
+              cabal-install
+            ];
+          };
+    };
+}
diff --git a/data/templates/haskell/template.toml b/data/templates/haskell/template.toml
--- a/data/templates/haskell/template.toml
+++ b/data/templates/haskell/template.toml
@@ -35,6 +35,11 @@
     """
 name = "isProject"
 
+[[options]]
+default = true
+desc = "whether to add an \"expand src\" comment used by cabal-fmt"
+name = "cabal-fmt"
+
 [[optionals]]
 ignores = [
   "cabal.project",
diff --git a/data/templates/haskell/{{ project }}.cabal b/data/templates/haskell/{{ project }}.cabal
--- a/data/templates/haskell/{{ project }}.cabal
+++ b/data/templates/haskell/{{ project }}.cabal
@@ -1,21 +1,21 @@
-cabal-version: 3.0
-name:          {{ project }}
-version:       {{ version }}
+cabal-version:   3.0
+name:            {{ project }}
+version:         {{ version }}
 
 -- synopsis:
 -- description:
 -- category:
-license:       {{ license }}
-license-file:  LICENSE
-author:        {{ name }}
-maintainer:    {{ name }} <{{ email }}>
-copyright:     Copyright (c) {{ name }} {{ year }}
-stability:     alpha
-homepage:      https://github.com/{{ github_username }}/{{ project }}
-bug-reports:   https://github.com/{{ github_username }}/{{ project }}/issues
+license:         {{ license }}
+license-file:    LICENSE
+author:          {{ name }}
+maintainer:      {{ name }} <{{ email }}>
+copyright:       Copyright (c) {{ name }} {{ year }}
+stability:       alpha
+homepage:        https://github.com/{{ github_username }}/{{ project }}
+bug-reports:     https://github.com/{{ github_username }}/{{ project }}/issues
 extra-doc-files:
-  README.md
   CHANGELOG.md
+  README.md
 
 common common-attrs
   build-depends:
@@ -27,35 +27,46 @@
     BangPatterns
     ConstraintKinds
     DataKinds
+    DefaultSignatures
     DeriveFoldable
     DeriveFunctor
     DeriveGeneric
     DeriveTraversable
+    DerivingStrategies
+    DuplicateRecordFields
     EmptyCase
     FlexibleContexts
     FlexibleInstances
     FunctionalDependencies
+    GADTs
+    GeneralizedNewtypeDeriving
     InstanceSigs
     KindSignatures
     LambdaCase
     MultiWayIf
+    NamedFieldPuns
     OverloadedStrings
     PartialTypeSignatures
     PatternSynonyms
+    QuantifiedConstraints
     RecordWildCards
-    DuplicateRecordFields
+    RoleAnnotations
     ScopedTypeVariables
+    StandaloneKindSignatures
     TupleSections
     TypeApplications
     TypeFamilies
+    TypeFamilyDependencies
     TypeOperators
-    UnicodeSyntax
     ViewPatterns
 
 library
   import:          common-attrs
   build-depends:
 
+{{#cabal-fmt}}
+  -- cabal-fmt: expand src
+{{/cabal-fmt}}
   exposed-modules:
 
   other-modules:
diff --git a/hinit.cabal b/hinit.cabal
--- a/hinit.cabal
+++ b/hinit.cabal
@@ -1,6 +1,6 @@
 cabal-version:   3.0
 name:            hinit
-version:         0.2.0
+version:         0.2.1
 synopsis:        Generic project initialization tool
 description:
   hinit is a generic project initialization tool similar to cookiecutter.
@@ -18,13 +18,14 @@
   CHANGELOG.md
   README.md
 
-tested-with:     GHC ==8.10.2
+tested-with:     GHC ==8.10.*
 data-dir:        data
 data-files:
   licenses/*.txt
   templates/haskell/**/*.hs
   templates/haskell/*.cabal
   templates/haskell/*.md
+  templates/haskell/*.nix
   templates/haskell/.gitignore
   templates/haskell/cabal.project
   templates/haskell/hie.yaml
@@ -74,12 +75,11 @@
     , containers                   ^>=0.6.2
     , directory                    ^>=1.3.6
     , exceptions                   ^>=0.10.4
-    , generic-lens                 ^>=2.0.0
     , Glob                         ^>=0.10.1
     , haskeline                    ^>=0.8.1
-    , lens                         ^>=4.19
     , megaparsec                   ^>=9.0.0
     , mustache                     ^>=2.3.1
+    , optics-core                  ^>=0.3.0
     , optparse-applicative         >=0.15.1 && <1.17
     , parser-combinators           ^>=1.2.1
     , path                         >=0.7.0  && <0.9
diff --git a/src/Hinit/License.hs b/src/Hinit/License.hs
--- a/src/Hinit/License.hs
+++ b/src/Hinit/License.hs
@@ -46,10 +46,8 @@
 initializeLicense ::
   (Has (Lift IO) sig m) => LicenseId -> Context -> Path a Dir -> m ()
 initializeLicense licenseId ctx projectPath = do
-  let targetFile = projectPath </> [relfile|LICENSE|]
   licenseFile <- getLicenseFile licenseId
-  let spdxCtx = buildSPDXContext ctx
-  let mRendered = render spdxCtx licenseFile
-  case mRendered of
-    Right rendered -> sendIO $ T.writeFile (toFilePath targetFile) rendered
-    Left e -> error [i|impossible, failed to render license: #{e}|]
+  let targetFile = projectPath </> [relfile|LICENSE|]
+      spdxCtx = buildSPDXContext ctx
+      rendered = unsafeRender spdxCtx licenseFile
+  sendIO $ T.writeFile (toFilePath targetFile) rendered
diff --git a/src/Hinit/Process.hs b/src/Hinit/Process.hs
--- a/src/Hinit/Process.hs
+++ b/src/Hinit/Process.hs
@@ -3,7 +3,6 @@
 import Control.Effect.Lift
 import Control.Effect.Terminal
 import Control.Effect.Throw
-import Control.Monad
 import Data.Maybe
 import Data.Text.Prettyprint.Doc
 import Hinit.Errors
diff --git a/src/Hinit/Template/Config.hs b/src/Hinit/Template/Config.hs
--- a/src/Hinit/Template/Config.hs
+++ b/src/Hinit/Template/Config.hs
@@ -8,11 +8,11 @@
 module Hinit.Template.Config where
 
 import Control.Applicative
-import Control.Lens ((^.), _1, _2, _3)
-import Data.Generics.Labels ()
 import Data.String.Interpolate
 import Data.Text (Text, pack, unpack)
+import Data.Tuple.Optics
 import GHC.Generics
+import Optics.Operators
 import System.FilePath.Glob
   ( Pattern,
     compile,