diff --git a/CHANGES.md b/CHANGES.md
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,6 +1,28 @@
 Nirum changelog
 ===============
 
+Version 0.4.2
+-------------
+
+Released on Aug 24, 2018.
+
+### Language
+
+ -  Fixed a bug that *package.toml* file had been failed to load when the system
+    locale does not use UTF-8. It's now independent from the system locale
+    settings.
+    [[#290], [#322] by Seunghun Lee]
+
+### Et cetera
+
+ -  The official Docker image repository was moved to
+    [nirumlang/nirum](https://hub.docker.com/r/nirumlang/nirum/)
+    (from [spoqa/nirum](https://hub.docker.com/r/spoqa/nirum/)).
+
+[#290]: https://github.com/nirum-lang/nirum/issues/290
+[#322]: https://github.com/nirum-lang/nirum/pull/322
+
+
 Version 0.4.1
 -------------
 
@@ -329,23 +351,23 @@
     Alpine Linux.  It's because Alpine Linux doesn't provide GHC 8.2 as of
     March 2018.
 
-[#13]: https://github.com/spoqa/nirum/issues/13
-[#100]: https://github.com/spoqa/nirum/issues/100
-[#126]: https://github.com/spoqa/nirum/issues/126
-[#178]: https://github.com/spoqa/nirum/issues/178
-[#217]: https://github.com/spoqa/nirum/issues/217
-[#220]: https://github.com/spoqa/nirum/issues/220
-[#227]: https://github.com/spoqa/nirum/pull/227
-[#253]: https://github.com/spoqa/nirum/pull/253
-[#254]: https://github.com/spoqa/nirum/pull/254
-[#255]: https://github.com/spoqa/nirum/pull/255
-[#257]: https://github.com/spoqa/nirum/pull/257
-[#258]: https://github.com/spoqa/nirum/pull/258
-[#259]: https://github.com/spoqa/nirum/pull/259
-[#267]: https://github.com/spoqa/nirum/pull/267
-[#269]: https://github.com/spoqa/nirum/pull/269
-[#272]: https://github.com/spoqa/nirum/pull/272
-[#277]: https://github.com/spoqa/nirum/pull/277
+[#13]: https://github.com/nirum-lang/nirum/issues/13
+[#100]: https://github.com/nirum-lang/nirum/issues/100
+[#126]: https://github.com/nirum-lang/nirum/issues/126
+[#178]: https://github.com/nirum-lang/nirum/issues/178
+[#217]: https://github.com/nirum-lang/nirum/issues/217
+[#220]: https://github.com/nirum-lang/nirum/issues/220
+[#227]: https://github.com/nirum-lang/nirum/pull/227
+[#253]: https://github.com/nirum-lang/nirum/pull/253
+[#254]: https://github.com/nirum-lang/nirum/pull/254
+[#255]: https://github.com/nirum-lang/nirum/pull/255
+[#257]: https://github.com/nirum-lang/nirum/pull/257
+[#258]: https://github.com/nirum-lang/nirum/pull/258
+[#259]: https://github.com/nirum-lang/nirum/pull/259
+[#267]: https://github.com/nirum-lang/nirum/pull/267
+[#269]: https://github.com/nirum-lang/nirum/pull/269
+[#272]: https://github.com/nirum-lang/nirum/pull/272
+[#277]: https://github.com/nirum-lang/nirum/pull/277
 [entry points]: https://setuptools.readthedocs.io/en/latest/pkg_resources.html#entry-points
 [python2-numbers-integral]: https://docs.python.org/2/library/numbers.html#numbers.Integral
 [python2-int]: https://docs.python.org/2/library/functions.html#int
@@ -385,7 +407,7 @@
  -  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
+[#232]: https://github.com/nirum-lang/nirum/issues/232
 
 
 Version 0.3.0
@@ -489,80 +511,80 @@
  -  The Docker image became based and built on [Alpine Linux][] so that
     the image is now much lighter.
 
-[#10]: https://github.com/spoqa/nirum/issues/10
-[#38]: https://github.com/spoqa/nirum/issues/38
-[#50]: https://github.com/spoqa/nirum/issues/50
-[#68]: https://github.com/spoqa/nirum/issues/68
-[#70]: https://github.com/spoqa/nirum/issues/70
-[#83]: https://github.com/spoqa/nirum/pull/83
-[#85]: https://github.com/spoqa/nirum/pull/85
-[#91]: https://github.com/spoqa/nirum/issues/91
-[#92]: https://github.com/spoqa/nirum/issues/92
-[#93]: https://github.com/spoqa/nirum/issues/93
-[#99]: https://github.com/spoqa/nirum/pull/99
-[#97]: https://github.com/spoqa/nirum/issues/97
-[#100]: https://github.com/spoqa/nirum/issues/100
-[#102]: https://github.com/spoqa/nirum/issues/102
-[#104]: https://github.com/spoqa/nirum/pull/104
-[#105]: https://github.com/spoqa/nirum/pull/105
-[#106]: https://github.com/spoqa/nirum/pull/106
-[#108]: https://github.com/spoqa/nirum/pull/108
-[#111]: https://github.com/spoqa/nirum/pull/111
-[#113]: https://github.com/spoqa/nirum/pull/113
-[#114]: https://github.com/spoqa/nirum/pull/114
-[#116]: https://github.com/spoqa/nirum/pull/116
-[#117]: https://github.com/spoqa/nirum/pull/117
-[#118]: https://github.com/spoqa/nirum/issues/118
-[#119]: https://github.com/spoqa/nirum/pull/119
-[#121]: https://github.com/spoqa/nirum/pull/121
-[#123]: https://github.com/spoqa/nirum/pull/123
-[#128]: https://github.com/spoqa/nirum/pull/128
-[#125]: https://github.com/spoqa/nirum/issues/125
-[#127]: https://github.com/spoqa/nirum/pull/127
-[#131]: https://github.com/spoqa/nirum/pull/131
-[#138]: https://github.com/spoqa/nirum/issues/138
-[#141]: https://github.com/spoqa/nirum/pull/141
-[#146]: https://github.com/spoqa/nirum/pull/146
-[#149]: https://github.com/spoqa/nirum/pull/149
-[#152]: https://github.com/spoqa/nirum/pull/152
-[#153]: https://github.com/spoqa/nirum/issues/153
-[#154]: https://github.com/spoqa/nirum/pull/154
-[#155]: https://github.com/spoqa/nirum/pull/155
-[#160]: https://github.com/spoqa/nirum/issues/160
-[#165]: https://github.com/spoqa/nirum/pull/165
-[#167]: https://github.com/spoqa/nirum/pull/167
-[#168]: https://github.com/spoqa/nirum/issues/168
-[#170]: https://github.com/spoqa/nirum/pull/170
-[#174]: https://github.com/spoqa/nirum/pull/174
-[#178]: https://github.com/spoqa/nirum/issues/178
-[#179]: https://github.com/spoqa/nirum/issues/179
-[#180]: https://github.com/spoqa/nirum/pull/180
-[#183]: https://github.com/spoqa/nirum/pull/183
-[#184]: https://github.com/spoqa/nirum/issues/184
-[#185]: https://github.com/spoqa/nirum/issues/185
-[#188]: https://github.com/spoqa/nirum/pull/188
-[#189]: https://github.com/spoqa/nirum/pull/189
-[#190]: https://github.com/spoqa/nirum/pull/190
-[#192]: https://github.com/spoqa/nirum/pull/192
-[#193]: https://github.com/spoqa/nirum/pull/193
-[#194]: https://github.com/spoqa/nirum/pull/194
-[#197]: https://github.com/spoqa/nirum/pull/197
-[#199]: https://github.com/spoqa/nirum/pull/199
-[#201]: https://github.com/spoqa/nirum/pull/201
-[#202]: https://github.com/spoqa/nirum/pull/202
-[#203]: https://github.com/spoqa/nirum/pull/203
-[#204]: https://github.com/spoqa/nirum/pull/204
-[#216]: https://github.com/spoqa/nirum/issues/216
-[#218]: https://github.com/spoqa/nirum/issues/218
-[#222]: https://github.com/spoqa/nirum/pull/222
-[#223]: https://github.com/spoqa/nirum/pull/223
-[#224]: https://github.com/spoqa/nirum/pull/224
-[nirum-python #22]: https://github.com/spoqa/nirum-python/issues/22
-[nirum-python #34]: https://github.com/spoqa/nirum-python/issues/34
-[nirum-python #49]: https://github.com/spoqa/nirum-python/issues/49
-[nirum-python #79]: https://github.com/spoqa/nirum-python/issues/79
-[nirum-python #88]: https://github.com/spoqa/nirum-python/pull/88
-[nirum-python #92]: https://github.com/spoqa/nirum-python/pull/92
+[#10]: https://github.com/nirum-lang/nirum/issues/10
+[#38]: https://github.com/nirum-lang/nirum/issues/38
+[#50]: https://github.com/nirum-lang/nirum/issues/50
+[#68]: https://github.com/nirum-lang/nirum/issues/68
+[#70]: https://github.com/nirum-lang/nirum/issues/70
+[#83]: https://github.com/nirum-lang/nirum/pull/83
+[#85]: https://github.com/nirum-lang/nirum/pull/85
+[#91]: https://github.com/nirum-lang/nirum/issues/91
+[#92]: https://github.com/nirum-lang/nirum/issues/92
+[#93]: https://github.com/nirum-lang/nirum/issues/93
+[#99]: https://github.com/nirum-lang/nirum/pull/99
+[#97]: https://github.com/nirum-lang/nirum/issues/97
+[#100]: https://github.com/nirum-lang/nirum/issues/100
+[#102]: https://github.com/nirum-lang/nirum/issues/102
+[#104]: https://github.com/nirum-lang/nirum/pull/104
+[#105]: https://github.com/nirum-lang/nirum/pull/105
+[#106]: https://github.com/nirum-lang/nirum/pull/106
+[#108]: https://github.com/nirum-lang/nirum/pull/108
+[#111]: https://github.com/nirum-lang/nirum/pull/111
+[#113]: https://github.com/nirum-lang/nirum/pull/113
+[#114]: https://github.com/nirum-lang/nirum/pull/114
+[#116]: https://github.com/nirum-lang/nirum/pull/116
+[#117]: https://github.com/nirum-lang/nirum/pull/117
+[#118]: https://github.com/nirum-lang/nirum/issues/118
+[#119]: https://github.com/nirum-lang/nirum/pull/119
+[#121]: https://github.com/nirum-lang/nirum/pull/121
+[#123]: https://github.com/nirum-lang/nirum/pull/123
+[#128]: https://github.com/nirum-lang/nirum/pull/128
+[#125]: https://github.com/nirum-lang/nirum/issues/125
+[#127]: https://github.com/nirum-lang/nirum/pull/127
+[#131]: https://github.com/nirum-lang/nirum/pull/131
+[#138]: https://github.com/nirum-lang/nirum/issues/138
+[#141]: https://github.com/nirum-lang/nirum/pull/141
+[#146]: https://github.com/nirum-lang/nirum/pull/146
+[#149]: https://github.com/nirum-lang/nirum/pull/149
+[#152]: https://github.com/nirum-lang/nirum/pull/152
+[#153]: https://github.com/nirum-lang/nirum/issues/153
+[#154]: https://github.com/nirum-lang/nirum/pull/154
+[#155]: https://github.com/nirum-lang/nirum/pull/155
+[#160]: https://github.com/nirum-lang/nirum/issues/160
+[#165]: https://github.com/nirum-lang/nirum/pull/165
+[#167]: https://github.com/nirum-lang/nirum/pull/167
+[#168]: https://github.com/nirum-lang/nirum/issues/168
+[#170]: https://github.com/nirum-lang/nirum/pull/170
+[#174]: https://github.com/nirum-lang/nirum/pull/174
+[#178]: https://github.com/nirum-lang/nirum/issues/178
+[#179]: https://github.com/nirum-lang/nirum/issues/179
+[#180]: https://github.com/nirum-lang/nirum/pull/180
+[#183]: https://github.com/nirum-lang/nirum/pull/183
+[#184]: https://github.com/nirum-lang/nirum/issues/184
+[#185]: https://github.com/nirum-lang/nirum/issues/185
+[#188]: https://github.com/nirum-lang/nirum/pull/188
+[#189]: https://github.com/nirum-lang/nirum/pull/189
+[#190]: https://github.com/nirum-lang/nirum/pull/190
+[#192]: https://github.com/nirum-lang/nirum/pull/192
+[#193]: https://github.com/nirum-lang/nirum/pull/193
+[#194]: https://github.com/nirum-lang/nirum/pull/194
+[#197]: https://github.com/nirum-lang/nirum/pull/197
+[#199]: https://github.com/nirum-lang/nirum/pull/199
+[#201]: https://github.com/nirum-lang/nirum/pull/201
+[#202]: https://github.com/nirum-lang/nirum/pull/202
+[#203]: https://github.com/nirum-lang/nirum/pull/203
+[#204]: https://github.com/nirum-lang/nirum/pull/204
+[#216]: https://github.com/nirum-lang/nirum/issues/216
+[#218]: https://github.com/nirum-lang/nirum/issues/218
+[#222]: https://github.com/nirum-lang/nirum/pull/222
+[#223]: https://github.com/nirum-lang/nirum/pull/223
+[#224]: https://github.com/nirum-lang/nirum/pull/224
+[nirum-python #22]: https://github.com/nirum-lang/nirum-python/issues/22
+[nirum-python #34]: https://github.com/nirum-lang/nirum-python/issues/34
+[nirum-python #49]: https://github.com/nirum-lang/nirum-python/issues/49
+[nirum-python #79]: https://github.com/nirum-lang/nirum-python/issues/79
+[nirum-python #88]: https://github.com/nirum-lang/nirum-python/pull/88
+[nirum-python #92]: https://github.com/nirum-lang/nirum-python/pull/92
 [python-exception]: https://docs.python.org/3/library/exceptions.html#Exception
 [targets.python]: ./target/python.md
 [python-name-error]: https://docs.python.org/3/library/exceptions.html#NameError
@@ -589,15 +611,15 @@
  -  Fixed a parser bug which had referred to a wrong line/column position on
     syntax error message when a trailing semicolon is missing.  [[#64]]
 
-[#40]: https://github.com/spoqa/nirum/issues/40
-[#53]: https://github.com/spoqa/nirum/pull/53
-[#57]: https://github.com/spoqa/nirum/pull/57
-[#64]: https://github.com/spoqa/nirum/pull/64
-[#65]: https://github.com/spoqa/nirum/issues/65
-[#69]: https://github.com/spoqa/nirum/issues/69
-[#71]: https://github.com/spoqa/nirum/pull/71
-[#73]: https://github.com/spoqa/nirum/pull/73
-[#81]: https://github.com/spoqa/nirum/pull/81
+[#40]: https://github.com/nirum-lang/nirum/issues/40
+[#53]: https://github.com/nirum-lang/nirum/pull/53
+[#57]: https://github.com/nirum-lang/nirum/pull/57
+[#64]: https://github.com/nirum-lang/nirum/pull/64
+[#65]: https://github.com/nirum-lang/nirum/issues/65
+[#69]: https://github.com/nirum-lang/nirum/issues/69
+[#71]: https://github.com/nirum-lang/nirum/pull/71
+[#73]: https://github.com/nirum-lang/nirum/pull/73
+[#81]: https://github.com/nirum-lang/nirum/pull/81
 
 ### Python target
 
@@ -608,11 +630,11 @@
  -  Fixed a bug that a Python class generated from a parameterless tag had
     been broken.  [[#55], [#66]]
 
-[#52]: https://github.com/spoqa/nirum/pull/52
-[#75]: https://github.com/spoqa/nirum/issues/75
-[#76]: https://github.com/spoqa/nirum/pull/76
-[#66]: https://github.com/spoqa/nirum/pull/66
-[#55]: https://github.com/spoqa/nirum/issues/55
+[#52]: https://github.com/nirum-lang/nirum/pull/52
+[#75]: https://github.com/nirum-lang/nirum/issues/75
+[#76]: https://github.com/nirum-lang/nirum/pull/76
+[#66]: https://github.com/nirum-lang/nirum/pull/66
+[#55]: https://github.com/nirum-lang/nirum/issues/55
 
 ### Et cetera
 
@@ -620,7 +642,7 @@
     [spoqa/nirum](https://hub.docker.com/r/spoqa/nirum/).
     [[#48] by Minyoung Jeong]
 
-[#48]: https://github.com/spoqa/nirum/pull/48
+[#48]: https://github.com/nirum-lang/nirum/pull/48
 
 
 
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -9,18 +9,18 @@
 [![Total lines of code][loc]][repo]
 [![Gitter][chat-svg]][chat]
 
-[release-svg]: https://img.shields.io/github/release/spoqa/nirum/all.svg
-[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
-[ci]: https://travis-ci.org/spoqa/nirum
+[release-svg]: https://img.shields.io/github/release/nirum-lang/nirum/all.svg
+[releases]: https://github.com/nirum-lang/nirum/releases
+[docker]: https://hub.docker.com/r/nirumlang/nirum/
+[docker-svg]: https://img.shields.io/docker/automated/nirumlang/nirum.svg
+[ci-svg]: https://travis-ci.com/nirum-lang/nirum.svg?branch=master
+[ci]: https://travis-ci.com/nirum-lang/nirum
 [ciw-svg]: https://ci.appveyor.com/api/projects/status/jf9bsrnalcb1xrp0?svg=true
 [ciw]: https://ci.appveyor.com/project/dahlia/nirum-k5n5y
-[cov-svg]: https://codecov.io/gh/spoqa/nirum/branch/master/graph/badge.svg
-[cov]: https://codecov.io/gh/spoqa/nirum
-[loc]: https://tokei.rs/b1/github/spoqa/nirum
-[repo]: https://github.com/spoqa/nirum
+[cov-svg]: https://codecov.io/gh/nirum-lang/nirum/branch/master/graph/badge.svg
+[cov]: https://codecov.io/gh/nirum-lang/nirum
+[loc]: https://tokei.rs/b1/github/nirum-lang/nirum
+[repo]: https://github.com/nirum-lang/nirum
 [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
 
@@ -60,8 +60,8 @@
 [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/
+[latest-release]: https://github.com/nirum-lang/nirum/releases/latest
+[docker-tags]: https://hub.docker.com/r/nirumlang/nirum/tags/
 
 
 ### Nightly builds
@@ -73,7 +73,7 @@
 - [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]
+- [Docker (`nirumlang/nirum:latest`)][docker]
 
 Although we call it "nightly build," technically it is not built every night,
 but done every merge commit.
@@ -93,7 +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 0.4.1
+      Nirum compiler 0.4.2
 
     Available options:
       -h,--help                Show this help text
@@ -132,28 +132,29 @@
 
 ### Language runtimes
 
- -   [nirum-python](https://github.com/spoqa/nirum-python): The official Python
-     runtime library for Nirum.
-     -   [nirum-python-http](https://github.com/spoqa/nirum-python-http):
+ -   [nirum-python](https://github.com/nirum-lang/nirum-python): The official
+     Python runtime library for Nirum.
+     -   [nirum-python-http](https://github.com/nirum-lang/nirum-python-http):
          Nirum HTTP transport for Python.
-     -   [nirum-python-wsgi](https://github.com/spoqa/nirum-python-wsgi):
+     -   [nirum-python-wsgi](https://github.com/nirum-lang/nirum-python-wsgi):
          Adapt Nirum services to WSGI apps.
 
 ### Editor supports
 
- -   [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].
- -   [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.
+ -   [nirum.tmbundle](https://github.com/nirum-lang/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].
+ -   [nirum.vim](https://github.com/nirum-lang/nirum.vim): Nirum syntax
+     highlighter for Vim/Neovim.
+ -   [sublime-nirum](https://github.com/nirum-lang/sublime-nirum): Nirum package
+     for Sublime Text 3.
  -   [nirum-syntax-highlighting](https://marketplace.visualstudio.com/items?itemName=Nirum.nirum-syntax-highlighting)
      for VS Code: Nirum syntax highlighter for VS Code.
 
 [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
+[TextMate bundles support]: https://github.com/nirum-lang/nirum.tmbundle#installation-intellij-idea-pycharm-etc
 
 
 Etymology
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: 68f1b33c406234a48717fa6ecdf0ce98bce610db2348e3b448b3579016479f2b
+-- hash: 5f111a8eea54d08aac4e2c80499e06c720220a0675b48cc03b2d3dd80dfbb54d
 
 name:           nirum
-version:        0.4.1
+version:        0.4.2
 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.
@@ -13,8 +13,8 @@
                 See also README.md for more details.
 category:       Language
 stability:      alpha
-homepage:       http://nirum.org/
-bug-reports:    https://github.com/spoqa/nirum/issues
+homepage:       https://nirum.org/
+bug-reports:    https://github.com/nirum-lang/nirum/issues
 author:         Nirum team
 maintainer:     Nirum team
 copyright:      (c) 2016–2018 Nirum team
@@ -28,7 +28,7 @@
 
 source-repository head
   type: git
-  location: git@github.com/spoqa/nirum.git
+  location: git://github.com/nirum-lang/nirum.git
 
 flag static
   description: Static link
@@ -91,7 +91,7 @@
     , heterocephalus >=1.0.5 && <1.1.0
     , htoml >=1.0.0.0 && <1.1.0.0
     , interpolatedstring-perl6 >=1.0.0 && <1.1.0
-    , megaparsec >=6.3 && <6.4
+    , megaparsec >=6.4 && <6.5
     , mtl >=2.2.1 && <3
     , optparse-applicative >=0.14 && <0.15
     , parsec
@@ -126,7 +126,7 @@
     , filepath >=1.4 && <1.5
     , htoml >=1.0.0.0 && <1.1.0.0
     , interpolatedstring-perl6 >=1.0.0 && <1.1.0
-    , megaparsec >=6.3 && <6.4
+    , megaparsec >=6.4 && <6.5
     , mtl >=2.2.1 && <3
     , nirum
     , parsec
@@ -161,10 +161,10 @@
     , directory >=1.2.5 && <1.4
     , email-validate >=2.0.0 && <3.0.0
     , filepath >=1.4 && <1.5
-    , hlint >=2.0.9 && <2.1
+    , hlint >=2.1.6 && <2.2
     , htoml >=1.0.0.0 && <1.1.0.0
     , interpolatedstring-perl6 >=1.0.0 && <1.1.0
-    , megaparsec >=6.3 && <6.4
+    , megaparsec >=6.4 && <6.5
     , mtl >=2.2.1 && <3
     , parsec
     , pretty >=1.1.3 && <2
@@ -229,7 +229,7 @@
     , htoml >=1.0.0.0 && <1.1.0.0
     , hxt >=9.3.1.16 && <9.4.0.0
     , interpolatedstring-perl6 >=1.0.0 && <1.1.0
-    , megaparsec >=6.3 && <6.4
+    , megaparsec >=6.4 && <6.5
     , mtl >=2.2.1 && <3
     , nirum
     , parsec
@@ -265,7 +265,7 @@
     , filepath >=1.4 && <1.5
     , htoml >=1.0.0.0 && <1.1.0.0
     , interpolatedstring-perl6 >=1.0.0 && <1.1.0
-    , megaparsec >=6.3 && <6.4
+    , megaparsec >=6.4 && <6.5
     , mtl >=2.2.1 && <3
     , parsec
     , pretty >=1.1.3 && <2
diff --git a/src/Nirum/Cli.hs b/src/Nirum/Cli.hs
--- a/src/Nirum/Cli.hs
+++ b/src/Nirum/Cli.hs
@@ -10,7 +10,7 @@
 import qualified Data.Map.Strict as M
 import qualified Data.Set as S
 import qualified Data.Text as T
-import Control.Concurrent.STM (atomically, newTVar, readTVar, TVar, writeTVar)
+import Control.Concurrent.STM
 import Data.Monoid ((<>))
 import qualified Options.Applicative as OPT
 import System.Directory (createDirectoryIfMissing)
@@ -198,12 +198,12 @@
 reactiveBuild options@AppOptions { building = building'
                                  , changed = changed'
                                  } = do
-    changed'' <- atomically $ readTVar changed'
+    changed'' <- readTVarIO changed'
     when changed'' $ do
         atomically $ writeTVar changed' False
         build options
         atomically $ writeTVar building' False
-        changedDuringBuild <- atomically $ readTVar changed'
+        changedDuringBuild <- readTVarIO changed'
         when changedDuringBuild $ reactiveBuild options
 
 tryDie :: AppOptions -> String -> IO ()
diff --git a/src/Nirum/Package/Metadata.hs b/src/Nirum/Package/Metadata.hs
--- a/src/Nirum/Package/Metadata.hs
+++ b/src/Nirum/Package/Metadata.hs
@@ -63,6 +63,7 @@
 import Data.Text.Encoding (encodeUtf8)
 import qualified Data.Text.IO as TIO
 import System.FilePath ((</>))
+import System.IO
 import Text.Email.Parser (EmailAddress)
 import qualified Text.Email.Validate as EV
 import Text.InterpolatedString.Perl6 (qq)
@@ -213,7 +214,9 @@
 
 readMetadata :: Target t => FilePath -> IO (Either MetadataError (Metadata t))
 readMetadata metadataPath' = do
-    tomlText <- TIO.readFile metadataPath'
+    h <- openFile metadataPath' ReadMode
+    hSetEncoding h utf8
+    tomlText <- TIO.hGetContents h
     return $ parseMetadata metadataPath' tomlText
 
 metadataPath :: FilePath -> FilePath
diff --git a/src/Nirum/Parser.hs b/src/Nirum/Parser.hs
--- a/src/Nirum/Parser.hs
+++ b/src/Nirum/Parser.hs
@@ -184,9 +184,8 @@
         Just _ -> do
             v <- manyTill charLiteral (char '"')
             return $ AI.Text $ T.pack v
-        Nothing -> do
-            v <- integer
-            return $ Integer v
+        Nothing ->
+            Integer <$> integer
 
 annotationArgument :: Parser (Identifier, AnnotationArgument)
 annotationArgument = do
diff --git a/src/Nirum/Targets/Docs.hs b/src/Nirum/Targets/Docs.hs
--- a/src/Nirum/Targets/Docs.hs
+++ b/src/Nirum/Targets/Docs.hs
@@ -155,7 +155,7 @@
 
 module' :: BoundModule Docs -> Html
 module' docsModule =
-    layout pkg depth (ModulePage docsModulePath) title $ [shamlet|
+    layout pkg depth (ModulePage docsModulePath) title [shamlet|
 $maybe tit <- headingTitle
     <h1>
         <dfn><code>#{path}</code>
@@ -313,7 +313,7 @@
 |]
 typeDecl _ _ TD.Import {} =
     error ("It shouldn't happen; please report it to Nirum's bug tracker:\n" ++
-           "https://github.com/spoqa/nirum/issues")
+           "https://github.com/nirum-lang/nirum/issues")
 
 nameText :: Name -> T.Text
 nameText = toNormalizedText . facialName
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
@@ -445,7 +445,7 @@
         fields'
     pyVer <- getPythonVersion
     defaultErrorHandler <- defaultDeserializerErrorHandler
-    return $ [compileText|
+    return [compileText|
 class #{className}(#{parentClass}):
 #{compileDocstringWithFields "    " d (map fcField fieldCodes)}
     __slots__ = (
@@ -1483,7 +1483,7 @@
 compileModuleBody src@Source { sourceModule = boundModule } = do
     let types' = boundTypes boundModule
     typeCodes <- mapM (compileTypeDeclaration src) $ toList types'
-    return $ [compileText|
+    return [compileText|
 %{forall typeCode <- typeCodes}
 #{typeCode}
 %{endforall}
@@ -1511,7 +1511,7 @@
                       M.assocs (thirdPartyImports context)
     let globalDefs = globalDefinitions context
     code <- result
-    return $ (deps, optDeps,) $
+    return $ (deps, optDeps,)
         [compileText|# -*- coding: utf-8 -*-
 #{compileDocstring "" $ sourceModule source}
 %{ forall (alias, import') <- M.assocs (standardImports context) }
diff --git a/src/Nirum/Targets/Python/CodeGen.hs b/src/Nirum/Targets/Python/CodeGen.hs
--- a/src/Nirum/Targets/Python/CodeGen.hs
+++ b/src/Nirum/Targets/Python/CodeGen.hs
@@ -216,7 +216,7 @@
         pyVer
 
 getPythonVersion :: CodeGen PythonVersion
-getPythonVersion = fmap pythonVersion Control.Monad.State.get
+getPythonVersion = Control.Monad.State.gets pythonVersion
 
 renameModulePath :: RenameMap -> ModulePath -> ModulePath
 renameModulePath renameMap path' =
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 4 1 [] []
+            version `shouldBe` SV.version 0 4 2 [] []
     describe "versionText" $ do
         it "is equivalent to version" $
             versionText `shouldBe` SV.toText version