diff --git a/R/DESCRIPTION b/R/DESCRIPTION
index 31acfe1..2eaa33c 100644
--- a/R/DESCRIPTION
+++ b/R/DESCRIPTION
@@ -1,8 +1,9 @@
 Package: feather
 Title: R Bindings to the Feather 'API'
-Version: 0.3.5.9000
+Version: 0.4.0
 Authors@R: c(
     person("Hadley", "Wickham", , "hadley@rstudio.com", role = c("aut", "cre")),
+    person("Neal", "Richardson", , "neal@ursalabs.org", role = "ctb"),
     person("RStudio", role = "cph"),
     person("LevelDB Authors", role = "ctb")
   )
diff --git a/R/NEWS.md b/R/NEWS.md
index 1c2b8ef..d93a418 100644
--- a/R/NEWS.md
+++ b/R/NEWS.md
@@ -1,4 +1,13 @@
-# feather (development version)
+# feather 0.4.0
+
+This release updates `feather` to depend on the [`arrow`](https://arrow.apache.org/docs/r/) package, which is where Feather format development has moved. This resolves many bug reports and missing features from the previous implementation of Feather in R, and it brings the R package in line with the Python `feather` package, which has depended on `pyarrow` since 2017.
+
+For compatibility, `feather::write_feather()` uses V1 of the Feather specification: it is a wrapper around `arrow::write_feather(version = 1)`. Feather V2 is just the Arrow format on disk and has support for a much richer set of data types. To switch to V2, we recommend just using `arrow::write_feather()`.
+
+With these changes, most of `feather`'s APIs are preserved in spirit, but there are some noteworthy changes:
+
+* The `feather` class, which allowed for accessing data in a Feather file without reading it all into R, has been replaced by an `arrow::Table` backed by the memory-mapped Feather file. This should preserve the intent of the original implementation but with much richer functionality. One behavior change that results though is that slicing/extracting from the Table results in another arrow Table, so the data aren't pulled into a `data.frame` until you `as.data.frame()` them.
+* `feather_metadata` also now does the same
 
 # feather 0.3.5
 
diff --git a/R/README.md b/R/README.md
index d41062b..9d8056c 100644
--- a/R/README.md
+++ b/R/README.md
@@ -1,7 +1,5 @@
 ## Feather for R
 
-[![Build Status](https://travis-ci.org/wesm/feather.svg?branch=master)](https://travis-ci.org/wesm/feather)
-
 Feather is file format designed for efficient on-disk serialisation of data frames that can be shared across programming languages (e.g. Python and R).
 
 ```R
@@ -10,6 +8,8 @@ write_feather(mtcars, "mtcars.feather")
 mtcars2 <- read_feather("mtcars.feather")
 ```
 
+Feather developement has continued in [Apache Arrow](https://arrow.apache.org/), and `feather` is now a wrapper around the [`arrow`](https://arrow.apache.org/docs/r/) package. We encourage you to update your workflows to use `arrow::write_feather()` and `arrow::read_feather()` directly.
+
 ## Installation
 
 Install the released version from CRAN: