diff --git a/CHANGES.md b/CHANGES.md
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,6 +1,29 @@
 Nirum changelog
 ===============
 
+Version 0.3.2
+-------------
+
+Released on March 15, 2018.
+
+### Et cetera
+
+ -  Fixed a broken build of the official Docker images.
+
+
+Version 0.3.1
+-------------
+
+Released on March 1, 2018.
+
+### Python target
+
+ -  Fixed record/union deserializers to ignore unknown fields in data payload.
+    Deserializers had raised `KeyError` before.  [#232]
+
+[#232]: https://github.com/spoqa/nirum/issues/232
+
+
 Version 0.3.0
 -------------
 
@@ -166,7 +189,6 @@
 [#203]: https://github.com/spoqa/nirum/pull/203
 [#204]: https://github.com/spoqa/nirum/pull/204
 [#216]: https://github.com/spoqa/nirum/issues/216
-[#222]: https://github.com/spoqa/nirum/pull/222
 [#218]: https://github.com/spoqa/nirum/issues/218
 [#222]: https://github.com/spoqa/nirum/pull/222
 [#223]: https://github.com/spoqa/nirum/pull/223
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 Nirum
 =====
 
-[![The latest release on GitHub][release-svg]][release]
+[![The latest release on GitHub][release-svg]][releases]
 [![Docker automated build][docker-svg]][docker]
 [![Build status on Linux and macOS (Travis CI)][ci-svg]][ci]
 [![Build status on Windows (AppVeyor)][ciw-svg]][ciw]
@@ -10,7 +10,7 @@
 [![Gitter][chat-svg]][chat]
 
 [release-svg]: https://img.shields.io/github/release/spoqa/nirum/all.svg
-[release]: https://github.com/spoqa/nirum/releases
+[releases]: https://github.com/spoqa/nirum/releases
 [docker]: https://hub.docker.com/r/spoqa/nirum/
 [docker-svg]: https://img.shields.io/docker/automated/spoqa/nirum.svg
 [ci-svg]: https://travis-ci.org/spoqa/nirum.svg?branch=master
@@ -24,8 +24,8 @@
 [chat-svg]: https://badges.gitter.im/spoqa/nirum.svg
 [chat]: https://gitter.im/spoqa/nirum?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge
 
-Nirum is an [IDL][1] compiler and [RPC][2]/[distributed object][3] framework
-for [microservices][4], built on top of the modern Web server technologies
+Nirum is an [IDL] compiler and [RPC]/[distributed object] framework
+for [microservices], built on top of the modern Web server technologies
 such as RESTful HTTP and JSON.
 
 You can find how the language looks like from source codes in the `examples/`
@@ -34,25 +34,51 @@
 **Note that its design is highly unstable and could be changed.**
 Also the feature set is incomplete yet.
 
-[1]: https://en.wikipedia.org/wiki/Interface_description_language
-[2]: https://en.wikipedia.org/wiki/Remote_procedure_call
-[3]: https://en.wikipedia.org/wiki/Distributed_object
-[4]: https://en.wikipedia.org/wiki/Microservices
+[IDL]: https://en.wikipedia.org/wiki/Interface_description_language
+[RPC]: https://en.wikipedia.org/wiki/Remote_procedure_call
+[distributed object]: https://en.wikipedia.org/wiki/Distributed_object
+[microservices]: https://en.wikipedia.org/wiki/Microservices
 
 
-Nightly builds
---------------
+Installation
+------------
 
-The easiest way to give a try to use Nirum is downloading a nightly build.
-We currently provides the prebuilt binaries of the following platforms:
+The Nirum compiler works on the most major platforms like Linux, macOS, and
+Windows.  We provide the prebuilt executable binaries for these three platforms.
 
+
+### Released builds
+
+You can download a executable binary for Linux (x86_64), macOS (x86_64), or
+Windows (x64 or x86) from the [latest release note][latest-release].
+You should give it appropriate permissions (e.g., `+x`) depending on your
+platform.
+
+If you look for a previous release, see the [list of all releases][releases].
+
+We provide official Docker images as well.  You can check the list of
+[released tags][docker-tags]. *Note that `latest` is for a nightly build which
+is unstable (see below).*
+
+[latest-release]: https://github.com/spoqa/nirum/releases/latest
+[docker-tags]: https://hub.docker.com/r/spoqa/nirum/tags/
+
+
+### Nightly builds
+
+Since Nirum is still changing by leaps and bounds, you could want to try
+its bleeding edge.  We provide nightly builds for this purpose.
+
 - [Linux (x86_64)](https://nightly-builds.nirum.org/travis-builds/nirum-linux-x86_64)
-- [Mac (x86_64)](https://nightly-builds.nirum.org/travis-builds/nirum-darwin-x86_64)
+- [macOS (x86_64)](https://nightly-builds.nirum.org/travis-builds/nirum-darwin-x86_64)
 - [Windows (x64)](https://ci.appveyor.com/api/projects/dahlia/nirum-k5n5y/artifacts/nirum-win-x64.exe?job=Platform%3A%20x64&branch=master)
 - [Windows (x86)](https://ci.appveyor.com/api/projects/dahlia/nirum-k5n5y/artifacts/nirum-win-x86.exe?job=Platform%3A%20x86&branch=master)
 - [Docker (`spoqa/nirum:latest`)][docker]
 
+Although we call it "nightly build," technically it is not built every night,
+but done every merge commit.
 
+
 Getting started
 ---------------
 
@@ -67,7 +93,7 @@
     Nirum: The IDL compiler and RPC/distributed object framework
 
     Usage: nirum [-v|--version] (-o|--output-dir DIR) (-t|--target TARGET) DIR
-      Nirum compiler 0.3.0
+      Nirum compiler 0.3.2
 
     Available options:
       -h,--help                Show this help text
@@ -82,7 +108,7 @@
 Building
 --------
 
-If you already installed [Haskell Stack][5], you can build the project
+If you already installed [Haskell Stack], you can build the project
 in the same way to build other Haskell softwares:
 
     $ stack build
@@ -94,15 +120,15 @@
 
 For details, please read the [contribution guide](./CONTRIBUTING.md).
 
-[5]: https://www.haskellstack.org/
+[Haskell Stack]: https://www.haskellstack.org/
 
 
 Related projects & tools
 ------------------------
 
-See also the [list of Nirum-related projects][7] on GitHub.  Have you kicked off
-a new project related to Nirum?  Please add *nirum* [topic][8] to your project
-on GitHub!
+See also the [list of Nirum-related projects][related-projects] on GitHub.
+Have you kicked off a new project related to Nirum?  Please add *nirum*
+[topic][github-topic] to your project on GitHub!
 
 ### Language runtimes
 
@@ -117,23 +143,23 @@
 
  -   [nirum.tmbundle](https://github.com/spoqa/nirum.tmbundle): TextMate bundle
      for Nirum.  Also can be used by IntelliJ IDEA (or any other JetBrain's
-     IDEs, e.g., PyCharm, WebStorm) through [TextMate bundles support][9].
+     IDEs, e.g., PyCharm, WebStorm) through [TextMate bundles support].
  -   [nirum.vim](https://github.com/spoqa/nirum.vim): Nirum syntax highlighter for
      Vim/Neovim.
  -   [sublime-nirum](https://github.com/spoqa/sublime-nirum): Nirum package for
      Sublime Text 3.
 
-[7]: https://github.com/search?q=topic:nirum+fork:false
-[8]: https://github.com/blog/2309-introducing-topics
-[9]: https://github.com/spoqa/nirum.tmbundle#installation-intellij-idea-pycharm-etc
+[related-projects]: https://github.com/search?q=topic:nirum+fork:false
+[github-topic]: https://github.com/blog/2309-introducing-topics
+[TextMate bundles support]: https://github.com/spoqa/nirum.tmbundle#installation-intellij-idea-pycharm-etc
 
 
 Etymology
 ---------
 
 **니름** (IPA: /niɾɯm/; *nireum*) is a sort of telepathy in the fictional world
-of [The Bird That Drinks Tears][9] (눈물을 마시는 새 *Nunmureul masineun sae*)
-by [Lee Yeongdo][10] (이영도).
+of [The Bird That Drinks Tears] (눈물을 마시는 새 *Nunmureul masineun sae*)
+by [Lee Yeongdo] (이영도).
 
-[9]: https://en.wikipedia.org/wiki/The_Bird_That_Drinks_Tears
-[10]: https://en.wikipedia.org/wiki/Lee_Yeongdo
+[The Bird That Drinks Tears]: https://en.wikipedia.org/wiki/The_Bird_That_Drinks_Tears
+[Lee Yeongdo]: https://en.wikipedia.org/wiki/Lee_Yeongdo
diff --git a/nirum.cabal b/nirum.cabal
--- a/nirum.cabal
+++ b/nirum.cabal
@@ -2,10 +2,10 @@
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: d73e14bde196f4880bd9edb7786571142a599151fd80cd02969fddf22f561a27
+-- hash: 3a99f67d2926d8a6b73021b3ece687ae7f0b60405baf702ebcedd5988e9bc909
 
 name:           nirum
-version:        0.3.0
+version:        0.3.2
 synopsis:       IDL compiler and RPC/distributed object framework for microservices
 
 description:    Nirum is an IDL compiler and RPC/distributed object framework for microservices, built on top of the modern Web server technologies such as RESTful HTTP and JSON.
diff --git a/src/Nirum/Targets/Python.hs b/src/Nirum/Targets/Python.hs
--- a/src/Nirum/Targets/Python.hs
+++ b/src/Nirum/Targets/Python.hs
@@ -966,7 +966,11 @@
             else:
                 name = attribute_name
             try:
-                args[name] = deserialize_meta(field_types[name], item)
+                field_type = field_types[name]
+            except KeyError:
+                continue
+            try:
+                args[name] = deserialize_meta(field_type, item)
             except ValueError as e:
                 errors.add('%s: %s' % (attribute_name, str(e)))
         if errors:
@@ -1107,7 +1111,11 @@
                 name = attribute_name
             tag_types = dict(cls.__nirum_tag_types__())
             try:
-                args[name] = deserialize_meta(tag_types[name], item)
+                field_type = tag_types[name]
+            except KeyError:
+                continue
+            try:
+                args[name] = deserialize_meta(field_type, item)
             except ValueError as e:
                 errors.add('%s: %s' % (attribute_name, str(e)))
         if errors:
diff --git a/test/Nirum/VersionSpec.hs b/test/Nirum/VersionSpec.hs
--- a/test/Nirum/VersionSpec.hs
+++ b/test/Nirum/VersionSpec.hs
@@ -17,7 +17,7 @@
             version `shouldSatisfy` SV.isDevelopment
         it "is the proper version" $
             -- is it a necessary test?
-            version `shouldBe` SV.version 0 3 0 [] []
+            version `shouldBe` SV.version 0 3 2 [] []
     describe "versionText" $ do
         it "is equivalent to version" $
             versionText `shouldBe` SV.toText version
