diff --git a/System/Random/MWC.hs b/System/Random/MWC.hs
index f5a235e..b84a97c 100644
--- a/System/Random/MWC.hs
+++ b/System/Random/MWC.hs
@@ -465,6 +465,10 @@ instance (s ~ PrimState m, PrimMonad m) => Random.StatefulGen (Gen s) m where
   {-# INLINE uniformWord32 #-}
   uniformWord64 = uniform
   {-# INLINE uniformWord64 #-}
+#if MIN_VERSION_random(1,3,0)
+  uniformByteArrayM isPinned n g = stToPrim (Random.genByteArrayST isPinned n (uniform g))
+  {-# INLINE uniformByteArrayM #-}
+#endif
   uniformShortByteString n g = stToPrim (Random.genShortByteStringST n (uniform g))
   {-# INLINE uniformShortByteString #-}
 
diff --git a/stack.yaml b/stack.yaml
index d43a951..f253ca8 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -4,5 +4,5 @@ packages:
 
 extra-deps:
 - github: haskell/random
-  commit: 81161a22de4bbc8de51af6e811eef8311b05ccc0
+  commit: 04a50941c8e1ebdac0e01f4354eae965c5adfa50
 allow-newer: true