diff --git a/graphula.cabal b/graphula.cabal
index be2d762..c609d1a 100644
--- a/graphula.cabal
+++ b/graphula.cabal
@@ -1,6 +1,6 @@
 cabal-version: 1.12
 
--- This file has been generated from package.yaml by hpack version 0.37.0.
+-- This file has been generated from package.yaml by hpack version 0.38.1.
 --
 -- see: https://github.com/sol/hpack
 
@@ -78,13 +78,14 @@ test-suite readme
   hs-source-dirs:
       test
   ghc-options: -Weverything -Wno-all-missed-specialisations -Wno-implicit-prelude -Wno-missing-import-lists -Wno-safe -Wno-unsafe -pgmL markdown-unlit
+  build-tool-depends:
+      markdown-unlit:markdown-unlit
   build-depends:
       QuickCheck
     , base <5
     , generic-arbitrary
     , graphula
     , hspec
-    , markdown-unlit
     , monad-logger
     , persistent
     , persistent-sqlite
diff --git a/package.yaml b/package.yaml
index bc4f3b5..50ce2c2 100644
--- a/package.yaml
+++ b/package.yaml
@@ -67,7 +67,6 @@ tests:
       - generic-arbitrary
       - graphula
       - hspec
-      - markdown-unlit
       - monad-logger
       - persistent
       - persistent-sqlite
@@ -82,6 +81,8 @@ tests:
       - condition: "flag(persistent-template)"
         dependencies:
           - persistent-template
+    build-tools:
+      - markdown-unlit
 
 flags:
   persistent-template:
diff --git a/src/Graphula/Arbitrary.hs b/src/Graphula/Arbitrary.hs
index 878786e..855fca7 100644
--- a/src/Graphula/Arbitrary.hs
+++ b/src/Graphula/Arbitrary.hs
@@ -1,4 +1,5 @@
 -- | 'Arbitrary' operations that respect Graphula's seed
+{-# OPTIONS_GHC -Wno-deprecations #-}
 module Graphula.Arbitrary
   ( generate
   ) where
diff --git a/stack-nightly.yaml b/stack-nightly.yaml
index ba559fb..9ea1c07 100644
--- a/stack-nightly.yaml
+++ b/stack-nightly.yaml
@@ -1 +1 @@
-resolver: nightly-2023-07-25
+resolver: nightly-2025-09-23
diff --git a/test/README.lhs b/test/README.lhs
index fda2924..343be64 100644
--- a/test/README.lhs
+++ b/test/README.lhs
@@ -45,7 +45,6 @@ import Graphula
 import Test.Hspec
 import Test.QuickCheck
 import Test.QuickCheck.Arbitrary.Generic
-import Text.Markdown.Unlit ()
 
 instance (ToBackendKey SqlBackend a) => Arbitrary (Key a) where
   arbitrary = toSqlKey <$> arbitrary