diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,9 @@
 # Changelog for hi-file-parser
 
+## 0.1.1.0
+
+Add `NFData` instances
+
 ## 0.1.0.0
 
 Initial release
diff --git a/hi-file-parser.cabal b/hi-file-parser.cabal
--- a/hi-file-parser.cabal
+++ b/hi-file-parser.cabal
@@ -1,13 +1,13 @@
 cabal-version: 1.12
 
--- This file has been generated from package.yaml by hpack version 0.31.1.
+-- This file has been generated from package.yaml by hpack version 0.33.0.
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: 2313c7d2911f3c633e0e5dc904c1a47cfe30b325de4f4aeac2752a703c62823d
+-- hash: af191a13968cedda5d64d117ea4e98f2223106716e965411a662809b08a5640c
 
 name:           hi-file-parser
-version:        0.1.0.0
+version:        0.1.1.0
 synopsis:       Parser for GHC's hi files
 description:    Please see the README on Github at <https://github.com/commercialhaskell/stack/blob/master/subs/hi-file-parser/README.md>
 category:       Development
diff --git a/src/HiFileParser.hs b/src/HiFileParser.hs
--- a/src/HiFileParser.hs
+++ b/src/HiFileParser.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE DeriveGeneric              #-}
 {-# LANGUAGE DerivingStrategies         #-}
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
 
@@ -32,6 +33,7 @@
 import           GHC.IO.IOMode                 (IOMode (..))
 import           Numeric                       (showHex)
 import           RIO.ByteString                as B (ByteString, hGetSome, null)
+import           RIO                           (Generic, NFData)
 import           System.IO                     (withBinaryFile)
 
 type IsBoot = Bool
@@ -40,19 +42,19 @@
 
 newtype List a = List
     { unList :: [a]
-    } deriving newtype (Show)
+    } deriving newtype (Show, NFData)
 
 newtype Dictionary = Dictionary
     { unDictionary :: V.Vector ByteString
-    } deriving newtype (Show)
+    } deriving newtype (Show, NFData)
 
 newtype Module = Module
     { unModule :: ModuleName
-    } deriving newtype (Show)
+    } deriving newtype (Show, NFData)
 
 newtype Usage = Usage
     { unUsage :: FilePath
-    } deriving newtype (Show)
+    } deriving newtype (Show, NFData)
 
 data Dependencies = Dependencies
     { dmods    :: List (ModuleName, IsBoot)
@@ -60,12 +62,14 @@
     , dorphs   :: List Module
     , dfinsts  :: List Module
     , dplugins :: List ModuleName
-    } deriving (Show)
+    } deriving (Show, Generic)
+instance NFData Dependencies
 
 data Interface = Interface
     { deps  :: Dependencies
     , usage :: List Usage
-    } deriving (Show)
+    } deriving (Show, Generic)
+instance NFData Interface
 
 -- | Read a block prefixed with its length
 withBlockPrefix :: Get a -> Get a