diff --git a/.travis.yml b/.travis.yml
index b8a28db..e96ae1d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,6 @@ language: ruby
 rvm:
   - 2.0.0-p598
   - 2.1.6
-  - 2.2.0
-  - 2.2.2
+  - 2.2.4
+  - 2.3.0
   - ruby-head
diff --git a/README.md b/README.md
index aff7ee3..70370de 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,24 @@ If you'd like to understand how/why this gem works, please check out my [blog po
 /written by tom lord/i.random_example #=> "WrITtEN bY tOM LORD"
 ```
 
+## Supported ruby versions
+* MRI 2.0.x
+* MRI 2.1.x
+* MRI 2.2.x
+* MRI 2.3.x
+* MRI 2.4.0-dev
+
+MRI ≤ 1.9.3 are not supported. This is primarily because MRI 2.0.0 introduced a new
+regexp engine (`Oniguruma` was replaced by `Onigmo`). Whilst *most* of this gem could
+be made to work with MRI 1.9.x (or even 1.8.x), I feel the changes are too significant
+to implement backwards compatability (especially since [long-term support for MRI
+1.9.3 has now ended](https://www.ruby-lang.org/en/news/2014/01/10/ruby-1-9-3-will-end-on-2015/)).
+
+For example, named properties (e.g. `/\p{Alpha}/`) are illegal syntax on MRI 1.9.3.
+
+Other implementations, such as JRuby, could probably work fine -
+but I haven't fully tried/tested it. Pull requests are welcome.
+
 ## Installation
 
 Add this line to your application's Gemfile:
diff --git a/db/unicode_ranges_2.3.pstore b/db/unicode_ranges_2.3.pstore
deleted file mode 120000
index 7bd1dda..0000000
--- a/db/unicode_ranges_2.3.pstore
+++ /dev/null
@@ -1 +0,0 @@
-unicode_ranges_2.2.pstore
\ No newline at end of file
diff --git a/db/unicode_ranges_2.3.pstore b/db/unicode_ranges_2.3.pstore
new file mode 100644
index 0000000..0359f42
Binary files /dev/null and b/db/unicode_ranges_2.3.pstore differ
diff --git a/db/unicode_ranges_2.4.pstore b/db/unicode_ranges_2.4.pstore
new file mode 100644
index 0000000..8b12125
Binary files /dev/null and b/db/unicode_ranges_2.4.pstore differ
diff --git a/lib/regexp-examples/version.rb b/lib/regexp-examples/version.rb
index 78fdf1b..803ab7c 100644
--- a/lib/regexp-examples/version.rb
+++ b/lib/regexp-examples/version.rb
@@ -1,4 +1,4 @@
 # Gem version
 module RegexpExamples
-  VERSION = '1.1.3'
+  VERSION = '1.1.4'
 end