diff --git a/fast_jsonapi.gemspec b/fast_jsonapi.gemspec
index 1f92281..d838808 100644
--- a/fast_jsonapi.gemspec
+++ b/fast_jsonapi.gemspec
@@ -24,6 +24,11 @@ Gem::Specification.new do |gem|
   gem.files = Dir['lib/**/*']
   gem.require_paths = ['lib']
   gem.extra_rdoc_files = ['LICENSE.txt', 'README.md']
+  gem.post_install_message = (
+    'This was previously known as `fast_jsonapi` ' \
+    'and it is now renamed to `jsonapi-serializer`. ' \
+    'Please see the project web page on how to migrate. Thank you!'
+  )
 
   gem.add_runtime_dependency('activesupport', '>= 4.2')
 
diff --git a/lib/fast_jsonapi/version.rb b/lib/fast_jsonapi/version.rb
index b5c6458..5de2b7f 100644
--- a/lib/fast_jsonapi/version.rb
+++ b/lib/fast_jsonapi/version.rb
@@ -1,3 +1,3 @@
 module FastJsonapi
-  VERSION = '1.7.2'.freeze
+  VERSION = '1.7.3'.freeze
 end