diff --git a/squib.gemspec b/squib.gemspec
index 3403d97..5c0969e 100644
--- a/squib.gemspec
+++ b/squib.gemspec
@@ -29,14 +29,14 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(/^(spec|samples|docs|benchmarks)\//)
   spec.require_paths = ['lib']
 
-  spec.add_runtime_dependency 'cairo',                 '1.15.3'# Locked in
-  spec.add_runtime_dependency 'gio2',                  '3.0.9' # for bug 172 # NOT 3.1.0 - broken on Linux
-  spec.add_runtime_dependency 'gobject-introspection', '3.0.9' # NOT 3.1.0 - broken on Linux
+  spec.add_runtime_dependency 'cairo',                 '~> 1.15.4'# Locked in
+  spec.add_runtime_dependency 'gio2',                  '~> 3.1.1' # for bug 172 # NOT 3.1.0 - broken on Linux
+  spec.add_runtime_dependency 'gobject-introspection', '~> 3.1.1' # NOT 3.1.0 - broken on Linux
   spec.add_runtime_dependency 'mercenary',             '~> 0.3.4'
   spec.add_runtime_dependency 'nokogiri',              '~> 1.7.0'
-  spec.add_runtime_dependency 'pango',                 '3.0.9' # NOT 3.1.0 - broken on Linux
+  spec.add_runtime_dependency 'pango',                 '~> 3.1.1' # NOT 3.1.0 - broken on Linux
   spec.add_runtime_dependency 'roo',                   '~> 2.7.0'
-  spec.add_runtime_dependency 'rsvg2',                 '3.0.9' # NOT 3.1.0 - broken on Linux
+  spec.add_runtime_dependency 'rsvg2',                 '~> 3.1.1' # NOT 3.1.0 - broken on Linux
   spec.add_runtime_dependency 'ruby-progressbar',      '~> 1.8'