diff --git a/Control/DeepSeq.hs b/Control/DeepSeq.hs
index c79bd5e..050f691 100644
--- a/Control/DeepSeq.hs
+++ b/Control/DeepSeq.hs
@@ -499,26 +499,33 @@ instance NFData1 Ratio where
 instance (NFData1 f, NFData1 g) => NFData1 (Compose f g) where
   liftRnf r = liftRnf (liftRnf r) . getCompose
 
--- | @since 1.4.3.0
-instance (NFData1 f, NFData1 g, NFData a) => NFData (Compose f g a) where
-  rnf = rnf1
+-- | Note: in @deepseq-1.5.0.0@ this instance's superclasses were changed.
+-- 
+-- @since 1.4.3.0
+instance (NFData (f (g a))) => NFData (Compose f g a) where
+  rnf (Compose fga) = rnf fga
 
 -- | @since 1.4.3.0
 instance (NFData1 f, NFData1 g) => NFData1 (Functor.Sum f g) where
   liftRnf rnf0 (Functor.InL l) = liftRnf rnf0 l
   liftRnf rnf0 (Functor.InR r) = liftRnf rnf0 r
 
--- | @since 1.4.3.0
-instance (NFData1 f, NFData1 g, NFData a) => NFData (Functor.Sum f g a) where
-  rnf = rnf1
+-- | Note: in @deepseq-1.5.0.0@ this instance's superclasses were changed.
+-- 
+-- @since 1.4.3.0
+instance (NFData (f a), NFData (g a)) => NFData (Functor.Sum f g a) where
+  rnf (Functor.InL fa) = rnf fa
+  rnf (Functor.InR ga) = rnf ga
 
 -- | @since 1.4.3.0
 instance (NFData1 f, NFData1 g) => NFData1 (Functor.Product f g) where
   liftRnf rnf0 (Functor.Pair f g) = liftRnf rnf0 f `seq` liftRnf rnf0 g
 
--- | @since 1.4.3.0
-instance (NFData1 f, NFData1 g, NFData a) => NFData (Functor.Product f g a) where
-  rnf = rnf1
+-- | Note: in @deepseq-1.5.0.0@ this instance's superclasses were changed.
+-- 
+-- @since 1.4.3.0
+instance (NFData (f a), NFData (g a)) => NFData (Functor.Product f g a) where
+  rnf (Functor.Pair fa ga) = rnf fa `seq` rnf ga
 
 instance NFData a => NFData (Ratio a) where
   rnf x = rnf (numerator x, denominator x)
diff --git a/changelog.md b/changelog.md
index 9ced552..dea7993 100644
--- a/changelog.md
+++ b/changelog.md
@@ -4,6 +4,8 @@
 
   * Add quantified superclasses to NFData(1,2)
     ([#88](https://github.com/haskell/deepseq/issues/88))
+  * Alter superclasses for Data.Functor.{Sum, Product}
+    ([#95])(https://github.com/haskell/deepseq/pull/95)
   * Drop support for GHC < 8.6
     ([#94](https://github.com/haskell/deepseq/pull/94))