diff --git a/CHANGELOG.md b/CHANGELOG.md
index 15efd13..a18f097 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,11 @@ The format is based on
 and this project adheres to
 [Haskell Package Versioning Policy](https://pvp.haskell.org/).
 
+## [Unreleased]
+### Changed
+- Remove deprecated `runCollectErrs`, `Resolution`, `CollectErrsT` from the
+  `Error` module.
+
 ## [1.2.0.3] - 2024-01-09
 ### Fixed
 - Fix corrupted source distribution.
@@ -519,6 +524,7 @@ and this project adheres to
 ### Added
 - Data types for the GraphQL language.
 
+[Unreleased]: https://git.caraus.tech/OSS/graphql/compare/v1.2.0.3...master
 [1.2.0.3]: https://git.caraus.tech/OSS/graphql/compare/v1.2.0.2...v1.2.0.3
 [1.2.0.2]: https://git.caraus.tech/OSS/graphql/compare/v1.2.0.1...v1.2.0.2
 [1.2.0.1]: https://git.caraus.tech/OSS/graphql/compare/v1.2.0.0...v1.2.0.1
diff --git a/src/Language/GraphQL/Error.hs b/src/Language/GraphQL/Error.hs
index 87ee702..4a406d0 100644
--- a/src/Language/GraphQL/Error.hs
+++ b/src/Language/GraphQL/Error.hs
@@ -8,28 +8,22 @@
 
 -- | Error handling.
 module Language.GraphQL.Error
-    ( CollectErrsT
-    , Error(..)
+    ( Error(..)
     , Path(..)
-    , Resolution(..)
     , ResolverException(..)
     , Response(..)
     , ResponseEventStream
     , parseError
-    , runCollectErrs
     ) where
 
 import Conduit
 import Control.Exception (Exception(..))
-import Control.Monad.Trans.State (StateT, runStateT)
-import Data.HashMap.Strict (HashMap)
 import Data.Sequence (Seq(..), (|>))
 import qualified Data.Sequence as Seq
 import Data.Text (Text)
 import qualified Data.Text as Text
-import Language.GraphQL.AST (Location(..), Name)
+import Language.GraphQL.AST (Location(..))
 import Language.GraphQL.Execute.Coerce
-import qualified Language.GraphQL.Type.Schema as Schema
 import Prelude hiding (null)
 import Text.Megaparsec
     ( ParseErrorBundle(..)
@@ -97,28 +91,3 @@ instance Show ResolverException where
     show (ResolverException e) = show e
 
 instance Exception ResolverException
-
--- * Deprecated
-
-{-# DEPRECATED runCollectErrs "runCollectErrs was part of the old executor and isn't used anymore" #-}
--- | Runs the given query computation, but collects the errors into an error
--- list, which is then sent back with the data.
-runCollectErrs :: (Monad m, Serialize a)
-    => HashMap Name (Schema.Type m)
-    -> CollectErrsT m a
-    -> m (Response a)
-runCollectErrs types' res = do
-    (dat, Resolution{..}) <- runStateT res
-        $ Resolution{ errors = Seq.empty, types = types' }
-    pure $ Response dat errors
-
-{-# DEPRECATED Resolution "Resolution was part of the old executor and isn't used anymore" #-}
--- | Executor context.
-data Resolution m = Resolution
-    { errors :: Seq Error
-    , types :: HashMap Name (Schema.Type m)
-    }
-
-{-# DEPRECATED CollectErrsT "CollectErrsT was part of the old executor and isn't used anymore" #-}
--- | A wrapper to pass error messages around.
-type CollectErrsT m = StateT (Resolution m) m