diff --git a/CHANGELOG.md b/CHANGELOG.md
index dde77a99..71fd4b35 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,11 @@
 
 # Revision history for nixfmt
 
+## 0.4.0 -- 2020-02-10
+* Report non-conforming files on the same line to aid line-oriented processing
+* Fix help, summary, and version flag contents.
+* Fix indentation of leading comments in parens
+
 ## 0.3.0 -- 2019-08-29
 
 * Added check flag for use in CI.
diff --git a/nixfmt.cabal b/nixfmt.cabal
index 5c9cbe90..4de649b8 100644
--- a/nixfmt.cabal
+++ b/nixfmt.cabal
@@ -6,7 +6,7 @@ cabal-version:       2.0
 -- SPDX-License-Identifier: MPL-2.0
 
 name:                nixfmt
-version:             0.3.0
+version:             0.4.0
 synopsis:            An opinionated formatter for Nix
 description:
   A formatter for Nix that ensures consistent and clear formatting by forgetting