diff --git a/Gemfile.lock b/Gemfile.lock
index 4216fa9..bad64dd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    ro-crate (0.5.0)
+    ro-crate (0.5.1)
       addressable (>= 2.7, < 2.9)
       rubyzip (~> 2.0.0)
 
diff --git a/ro_crate.gemspec b/ro_crate.gemspec
index c3be422..56039eb 100644
--- a/ro_crate.gemspec
+++ b/ro_crate.gemspec
@@ -1,6 +1,6 @@
 Gem::Specification.new do |s|
   s.name        = 'ro-crate'
-  s.version     = '0.5.0'
+  s.version     = '0.5.1'
   s.summary     = 'Create, manipulate, read RO-Crates.'
   s.authors     = ['Finn Bacall']
   s.email       = 'finn.bacall@manchester.ac.uk'