diff --git a/vector/changelog.md b/vector/changelog.md
index 2259a7ff..ed7e85c2 100644
--- a/vector/changelog.md
+++ b/vector/changelog.md
@@ -2,7 +2,9 @@
 
  * [#522](https://github.com/haskell/vector/pull/522) API using Applicatives
    added: `traverse` & friends.
-   * [#518](https://github.com/haskell/vector/pull/518) `UnboxViaStorable` added.
+ * [#545](https://github.com/haskell/vector/pull/545) `mapInPlace`,
+   `imapInPlace`, `mapInPlaceM`, `imapInPlaceM` added to mutable vectors API.
+ * [#518](https://github.com/haskell/vector/pull/518) `UnboxViaStorable` added.
    Vector constructors are reexported for `DoNotUnbox*`.
  * [#531](https://github.com/haskell/vector/pull/531) `iconcatMap` added.
 
diff --git a/vector/src/Data/Vector/Generic/Mutable.hs b/vector/src/Data/Vector/Generic/Mutable.hs
index 0f55e6f1..7ccf21dc 100644
--- a/vector/src/Data/Vector/Generic/Mutable.hs
+++ b/vector/src/Data/Vector/Generic/Mutable.hs
@@ -58,6 +58,7 @@ module Data.Vector.Generic.Mutable (
   ifoldr, ifoldr', ifoldrM, ifoldrM',
 
   -- * Modifying vectors
+  mapInPlace, imapInPlace, mapInPlaceM, imapInPlaceM,
   nextPermutation, nextPermutationBy,
   prevPermutation, prevPermutationBy,
 
@@ -77,6 +78,7 @@ module Data.Vector.Generic.Mutable (
   PrimMonad, PrimState, RealWorld
 ) where
 
+import           Control.Monad ((<=<))
 import           Data.Vector.Generic.Mutable.Base
 import qualified Data.Vector.Generic.Base as V
 
@@ -1215,6 +1217,37 @@ partitionWithUnknown f s
 -- Modifying vectors
 -- -----------------
 
+-- | Modify vector in place by applying function to each element.
+--
+-- @since NEXT_VERSION
+mapInPlace :: (PrimMonad m, MVector v a) => (a -> a) -> v (PrimState m) a -> m ()
+{-# INLINE mapInPlace #-}
+mapInPlace f = imapInPlace (\_ -> f)
+
+-- | Modify vector in place by applying function to each element and its index.
+--
+-- @since NEXT_VERSION
+imapInPlace :: (PrimMonad m, MVector v a) => (Int -> a -> a) -> v (PrimState m) a -> m ()
+{-# INLINE imapInPlace #-}
+imapInPlace f v
+  = stToPrim $ iforM_ v $ \i -> unsafeWrite v i . f i
+
+-- | Modify vector in place by applying monadic function to each element in order.
+--
+-- @since NEXT_VERSION
+mapInPlaceM :: (PrimMonad m, MVector v a) => (a -> m a) -> v (PrimState m) a -> m ()
+{-# INLINE mapInPlaceM #-}
+mapInPlaceM f
+  = imapInPlaceM (\_ -> f)
+
+-- | Modify vector in place by applying monadic function to each element and its index in order.
+--
+-- @since NEXT_VERSION
+imapInPlaceM :: (PrimMonad m, MVector v a) => (Int -> a -> m a) -> v (PrimState m) a -> m ()
+{-# INLINE imapInPlaceM #-}
+imapInPlaceM f v
+  = iforM_ v $ \i -> unsafeWrite v i <=< f i
+
 
 -- | Compute the (lexicographically) next permutation of the given vector in-place.
 -- Returns False when the input is the last item in the enumeration, i.e., if it is in
diff --git a/vector/src/Data/Vector/Mutable.hs b/vector/src/Data/Vector/Mutable.hs
index b84f242c..82a60c67 100644
--- a/vector/src/Data/Vector/Mutable.hs
+++ b/vector/src/Data/Vector/Mutable.hs
@@ -57,6 +57,7 @@ module Data.Vector.Mutable (
   ifoldr, ifoldr', ifoldrM, ifoldrM',
 
   -- * Modifying vectors
+  mapInPlace, imapInPlace, mapInPlaceM, imapInPlaceM,
   nextPermutation, nextPermutationBy,
   prevPermutation, prevPermutationBy,
 
@@ -571,6 +572,34 @@ unsafeMove = G.unsafeMove
 -- Modifying vectors
 -- -----------------
 
+-- | Modify vector in place by applying function to each element.
+--
+-- @since NEXT_VERSION
+mapInPlace :: (PrimMonad m) => (a -> a) -> MVector (PrimState m) a -> m ()
+{-# INLINE mapInPlace #-}
+mapInPlace = G.mapInPlace
+
+-- | Modify vector in place by applying function to each element and its index.
+--
+-- @since NEXT_VERSION
+imapInPlace :: (PrimMonad m) => (Int -> a -> a) -> MVector (PrimState m) a -> m ()
+{-# INLINE imapInPlace #-}
+imapInPlace = G.imapInPlace
+
+-- | Modify vector in place by applying monadic function to each element in order.
+--
+-- @since NEXT_VERSION
+mapInPlaceM :: (PrimMonad m) => (a -> m a) -> MVector (PrimState m) a -> m ()
+{-# INLINE mapInPlaceM #-}
+mapInPlaceM = G.mapInPlaceM
+
+-- | Modify vector in place by applying monadic function to each element and its index in order.
+--
+-- @since NEXT_VERSION
+imapInPlaceM :: (PrimMonad m) => (Int -> a -> m a) -> MVector (PrimState m) a -> m ()
+{-# INLINE imapInPlaceM #-}
+imapInPlaceM = G.imapInPlaceM
+
 -- | Compute the (lexicographically) next permutation of the given vector in-place.
 -- Returns False when the input is the last item in the enumeration, i.e., if it is in
 -- weakly descending order. In this case the vector will not get updated,
diff --git a/vector/src/Data/Vector/Primitive/Mutable.hs b/vector/src/Data/Vector/Primitive/Mutable.hs
index 15710ff9..627a2350 100644
--- a/vector/src/Data/Vector/Primitive/Mutable.hs
+++ b/vector/src/Data/Vector/Primitive/Mutable.hs
@@ -56,6 +56,7 @@ module Data.Vector.Primitive.Mutable (
   ifoldr, ifoldr', ifoldrM, ifoldrM',
 
   -- * Modifying vectors
+  mapInPlace, imapInPlace, mapInPlaceM, imapInPlaceM,
   nextPermutation, nextPermutationBy,
   prevPermutation, prevPermutationBy,
 
@@ -535,6 +536,34 @@ unsafeMove = G.unsafeMove
 -- Modifying vectors
 -- -----------------
 
+-- | Modify vector in place by applying function to each element.
+--
+-- @since NEXT_VERSION
+mapInPlace :: (PrimMonad m, Prim a) => (a -> a) -> MVector (PrimState m) a -> m ()
+{-# INLINE mapInPlace #-}
+mapInPlace = G.mapInPlace
+
+-- | Modify vector in place by applying function to each element and its index.
+--
+-- @since NEXT_VERSION
+imapInPlace :: (PrimMonad m, Prim a) => (Int -> a -> a) -> MVector (PrimState m) a -> m ()
+{-# INLINE imapInPlace #-}
+imapInPlace = G.imapInPlace
+
+-- | Modify vector in place by applying monadic function to each element in order.
+--
+-- @since NEXT_VERSION
+mapInPlaceM :: (PrimMonad m, Prim a) => (a -> m a) -> MVector (PrimState m) a -> m ()
+{-# INLINE mapInPlaceM #-}
+mapInPlaceM = G.mapInPlaceM
+
+-- | Modify vector in place by applying monadic function to each element and its index in order.
+--
+-- @since NEXT_VERSION
+imapInPlaceM :: (PrimMonad m, Prim a) => (Int -> a -> m a) -> MVector (PrimState m) a -> m ()
+{-# INLINE imapInPlaceM #-}
+imapInPlaceM = G.imapInPlaceM
+
 -- | Compute the (lexicographically) next permutation of the given vector in-place.
 -- Returns False when the input is the last item in the enumeration, i.e., if it is in
 -- weakly descending order. In this case the vector will not get updated,
diff --git a/vector/src/Data/Vector/Storable/Mutable.hs b/vector/src/Data/Vector/Storable/Mutable.hs
index ccde3c2e..524bd691 100644
--- a/vector/src/Data/Vector/Storable/Mutable.hs
+++ b/vector/src/Data/Vector/Storable/Mutable.hs
@@ -57,6 +57,7 @@ module Data.Vector.Storable.Mutable(
   ifoldr, ifoldr', ifoldrM, ifoldrM',
 
   -- * Modifying vectors
+  mapInPlace, imapInPlace, mapInPlaceM, imapInPlaceM,
   nextPermutation, nextPermutationBy,
   prevPermutation, prevPermutationBy,
 
@@ -635,6 +636,35 @@ unsafeMove = G.unsafeMove
 -- Modifying vectors
 -- -----------------
 
+
+-- | Modify vector in place by applying function to each element.
+--
+-- @since NEXT_VERSION
+mapInPlace :: (PrimMonad m, Storable a) => (a -> a) -> MVector (PrimState m) a -> m ()
+{-# INLINE mapInPlace #-}
+mapInPlace = G.mapInPlace
+
+-- | Modify vector in place by applying function to each element and its index.
+--
+-- @since NEXT_VERSION
+imapInPlace :: (PrimMonad m, Storable a) => (Int -> a -> a) -> MVector (PrimState m) a -> m ()
+{-# INLINE imapInPlace #-}
+imapInPlace = G.imapInPlace
+
+-- | Modify vector in place by applying monadic function to each element in order.
+--
+-- @since NEXT_VERSION
+mapInPlaceM :: (PrimMonad m, Storable a) => (a -> m a) -> MVector (PrimState m) a -> m ()
+{-# INLINE mapInPlaceM #-}
+mapInPlaceM = G.mapInPlaceM
+
+-- | Modify vector in place by applying monadic function to each element and its index in order.
+--
+-- @since NEXT_VERSION
+imapInPlaceM :: (PrimMonad m, Storable a) => (Int -> a -> m a) -> MVector (PrimState m) a -> m ()
+{-# INLINE imapInPlaceM #-}
+imapInPlaceM = G.imapInPlaceM
+
 -- | Compute the (lexicographically) next permutation of the given vector in-place.
 -- Returns False when the input is the last item in the enumeration, i.e., if it is in
 -- weakly descending order. In this case the vector will not get updated,
diff --git a/vector/src/Data/Vector/Strict/Mutable.hs b/vector/src/Data/Vector/Strict/Mutable.hs
index 4a2fdd6f..7af79a75 100644
--- a/vector/src/Data/Vector/Strict/Mutable.hs
+++ b/vector/src/Data/Vector/Strict/Mutable.hs
@@ -61,6 +61,7 @@ module Data.Vector.Strict.Mutable (
   ifoldr, ifoldr', ifoldrM, ifoldrM',
 
   -- * Modifying vectors
+  mapInPlace, imapInPlace, mapInPlaceM, imapInPlaceM,
   nextPermutation, nextPermutationBy,
   prevPermutation, prevPermutationBy,
 
@@ -550,6 +551,34 @@ unsafeMove = G.unsafeMove
 -- Modifying vectors
 -- -----------------
 
+-- | Modify vector in place by applying function to each element.
+--
+-- @since NEXT_VERSION
+mapInPlace :: (PrimMonad m) => (a -> a) -> MVector (PrimState m) a -> m ()
+{-# INLINE mapInPlace #-}
+mapInPlace = G.mapInPlace
+
+-- | Modify vector in place by applying function to each element and its index.
+--
+-- @since NEXT_VERSION
+imapInPlace :: (PrimMonad m) => (Int -> a -> a) -> MVector (PrimState m) a -> m ()
+{-# INLINE imapInPlace #-}
+imapInPlace = G.imapInPlace
+
+-- | Modify vector in place by applying monadic function to each element in order.
+--
+-- @since NEXT_VERSION
+mapInPlaceM :: (PrimMonad m) => (a -> m a) -> MVector (PrimState m) a -> m ()
+{-# INLINE mapInPlaceM #-}
+mapInPlaceM = G.mapInPlaceM
+
+-- | Modify vector in place by applying monadic function to each element and its index in order.
+--
+-- @since NEXT_VERSION
+imapInPlaceM :: (PrimMonad m) => (Int -> a -> m a) -> MVector (PrimState m) a -> m ()
+{-# INLINE imapInPlaceM #-}
+imapInPlaceM = G.imapInPlaceM
+
 -- | Compute the (lexicographically) next permutation of the given vector in-place.
 -- Returns False when the input is the last item in the enumeration, i.e., if it is in
 -- weakly descending order. In this case the vector will not get updated,
diff --git a/vector/src/Data/Vector/Unboxed/Mutable.hs b/vector/src/Data/Vector/Unboxed/Mutable.hs
index 0b0c9ec9..e7bcaed2 100644
--- a/vector/src/Data/Vector/Unboxed/Mutable.hs
+++ b/vector/src/Data/Vector/Unboxed/Mutable.hs
@@ -58,6 +58,7 @@ module Data.Vector.Unboxed.Mutable (
   ifoldr, ifoldr', ifoldrM, ifoldrM',
 
   -- * Modifying vectors
+  mapInPlace, imapInPlace, mapInPlaceM, imapInPlaceM,
   nextPermutation, nextPermutationBy,
   prevPermutation, prevPermutationBy,
 
@@ -442,6 +443,34 @@ unsafeMove = G.unsafeMove
 -- Modifying vectors
 -- -----------------
 
+-- | Modify vector in place by applying function to each element.
+--
+-- @since NEXT_VERSION
+mapInPlace :: (PrimMonad m, Unbox a) => (a -> a) -> MVector (PrimState m) a -> m ()
+{-# INLINE mapInPlace #-}
+mapInPlace = G.mapInPlace
+
+-- | Modify vector in place by applying function to each element and its index.
+--
+-- @since NEXT_VERSION
+imapInPlace :: (PrimMonad m, Unbox a) => (Int -> a -> a) -> MVector (PrimState m) a -> m ()
+{-# INLINE imapInPlace #-}
+imapInPlace = G.imapInPlace
+
+-- | Modify vector in place by applying monadic function to each element in order.
+--
+-- @since NEXT_VERSION
+mapInPlaceM :: (PrimMonad m, Unbox a) => (a -> m a) -> MVector (PrimState m) a -> m ()
+{-# INLINE mapInPlaceM #-}
+mapInPlaceM = G.mapInPlaceM
+
+-- | Modify vector in place by applying monadic function to each element and its index in order.
+--
+-- @since NEXT_VERSION
+imapInPlaceM :: (PrimMonad m, Unbox a) => (Int -> a -> m a) -> MVector (PrimState m) a -> m ()
+{-# INLINE imapInPlaceM #-}
+imapInPlaceM = G.imapInPlaceM
+
 -- | Compute the (lexicographically) next permutation of the given vector in-place.
 -- Returns False when the input is the last item in the enumeration, i.e., if it is in
 -- weakly descending order. In this case the vector will not get updated,
diff --git a/vector/tests/Tests/Vector/Property.hs b/vector/tests/Tests/Vector/Property.hs
index f1326850..e5df9ab6 100644
--- a/vector/tests/Tests/Vector/Property.hs
+++ b/vector/tests/Tests/Vector/Property.hs
@@ -208,7 +208,8 @@ testPolymorphicFunctions _ = $(testProperties [
         'prop_mut_foldr, 'prop_mut_foldr', 'prop_mut_foldl, 'prop_mut_foldl',
         'prop_mut_ifoldr, 'prop_mut_ifoldr', 'prop_mut_ifoldl, 'prop_mut_ifoldl',
         'prop_mut_foldM, 'prop_mut_foldM', 'prop_mut_foldrM, 'prop_mut_foldrM',
-        'prop_mut_ifoldM, 'prop_mut_ifoldM', 'prop_mut_ifoldrM, 'prop_mut_ifoldrM'
+        'prop_mut_ifoldM, 'prop_mut_ifoldM', 'prop_mut_ifoldrM, 'prop_mut_ifoldrM',
+        'prop_mut_mapInPlace, 'prop_mut_imapInPlace, 'prop_mut_mapInPlaceM, 'prop_mut_imapInPlaceM
     ])
   where
     -- Prelude
@@ -591,6 +592,33 @@ testPolymorphicFunctions _ = $(testProperties [
     prop_mut_imapM_ :: P ((Int -> a -> Writer [a] ()) -> v a -> Writer [a] ())
       = (\f v -> liftRunST $ MV.imapM_ (\i x -> hoistST $ f i x) =<< V.thaw v) `eq` imapM_
 
+    prop_mut_mapInPlace :: P ((a -> a) -> v a -> v a)
+    prop_mut_mapInPlace
+      = (\f v -> runST $ do mv <- V.thaw v
+                            MV.mapInPlace f mv
+                            V.freeze mv
+        ) `eq` map
+    prop_mut_imapInPlace :: P ((Int -> a -> a) -> v a -> v a)
+    prop_mut_imapInPlace
+      = (\f v -> runST $ do mv <- V.thaw v
+                            MV.imapInPlace f mv
+                            V.freeze mv
+        ) `eq` imap
+    prop_mut_mapInPlaceM :: P ((a -> Writer [a] a) -> v a -> Writer [a] (v a))
+    prop_mut_mapInPlaceM
+      = (\f v -> liftRunST $ do mv <- V.thaw v
+                                MV.mapInPlaceM (\a -> hoistST $ f a) mv
+                                V.freeze mv
+        ) `eq` mapM
+    prop_mut_imapInPlaceM :: P ((Int -> a -> Writer [a] a) -> v a -> Writer [a] (v a))
+    prop_mut_imapInPlaceM
+      = (\f v -> liftRunST $ do mv <- V.thaw v
+                                MV.imapInPlaceM (\i a -> hoistST (f i a)) mv
+                                V.freeze mv
+        ) `eq` imapM
+
+
+
 
 liftRunST :: (forall s. WriterT w (ST s) a) -> Writer w a
 liftRunST m = WriterT $ Identity $ runST $ runWriterT m
diff --git a/vector/vector.cabal b/vector/vector.cabal
index 177dac34..f4f38417 100644
--- a/vector/vector.cabal
+++ b/vector/vector.cabal
@@ -101,7 +101,6 @@ common flag-Wall
     if impl(ghc >= 8.0) && impl(ghc < 8.1)
       Ghc-Options:   -Wno-redundant-constraints
 
-
 Library
   import:           flag-Wall
   Default-Language: Haskell2010
@@ -184,6 +183,9 @@ Library
 -- rewrite rules
 common tests-common
   Default-Language: Haskell2010
+  -- Disable pointless warning about partial functions
+  if impl(ghc >= 9.8)
+    Ghc-Options:  -Wno-x-partial
   Ghc-Options:      -fno-warn-missing-signatures
   hs-source-dirs:   tests
   Build-Depends: base >= 4.5 && < 5