diff --git a/github-linguist.gemspec b/github-linguist.gemspec
index f10f8d1f..ca7647b8 100644
--- a/github-linguist.gemspec
+++ b/github-linguist.gemspec
@@ -1,6 +1,6 @@
 Gem::Specification.new do |s|
   s.name    = 'github-linguist'
-  s.version = '2.10.11'
+  s.version = '2.10.12'
   s.summary = "GitHub Language detection"
   s.description = 'We use this library at GitHub to detect blob languages, highlight code, ignore binary files, suppress generated files in diffs, and generate language breakdown graphs.'
 
diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 324576db..561674b3 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1873,6 +1873,7 @@ XML:
   - .kml
   - .launch
   - .mxml
+  - .osm
   - .plist
   - .pluginspec
   - .ps1xml