diff --git a/Gemfile b/Gemfile
index 47c82945..711a3bfe 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,14 +3,14 @@ source "https://rubygems.org"
 gemspec
 
 group :develop do
-  gem 'rdf-isomorphic', git: "https://github.com/ruby-rdf/rdf-isomorphic",  branch: "develop"
-  gem "rdf-reasoner",   git: "https://github.com/ruby-rdf/rdf-reasoner",    branch: "develop"
-  gem "rdf-spec",       git: "https://github.com/ruby-rdf/rdf-spec",        branch: "develop"
-  gem "rdf-turtle",     git: "https://github.com/ruby-rdf/rdf-turtle",      branch: "develop"
-  gem "rdf-vocab",      git: "https://github.com/ruby-rdf/rdf-vocab",       branch: "develop"
-  gem "rdf-xsd",        git: "https://github.com/ruby-rdf/rdf-xsd",         branch: "develop"
+  #gem 'rdf-isomorphic', git: "https://github.com/ruby-rdf/rdf-isomorphic",  branch: "develop"
+  #gem "rdf-reasoner",   git: "https://github.com/ruby-rdf/rdf-reasoner",    branch: "develop"
+  #gem "rdf-spec",       git: "https://github.com/ruby-rdf/rdf-spec",        branch: "develop"
+  #gem "rdf-turtle",     git: "https://github.com/ruby-rdf/rdf-turtle",      branch: "develop"
+  #gem "rdf-vocab",      git: "https://github.com/ruby-rdf/rdf-vocab",       branch: "develop"
+  #gem "rdf-xsd",        git: "https://github.com/ruby-rdf/rdf-xsd",         branch: "develop"
 
-  gem "ebnf",           git: "https://github.com/dryruby/ebnf",             branch: "develop"
+  #gem "ebnf",           git: "https://github.com/dryruby/ebnf",             branch: "develop"
   gem "sxp",            git: "https://github.com/dryruby/sxp",              branch: "develop"
 
   gem 'rest-client-components'
diff --git a/rdf.gemspec b/rdf.gemspec
index a6f3daf9..103264db 100755
--- a/rdf.gemspec
+++ b/rdf.gemspec
@@ -30,10 +30,10 @@ Gem::Specification.new do |gem|
   gem.required_ruby_version      = '>= 2.6'
   gem.requirements               = []
   gem.add_runtime_dependency     'link_header', '~> 0.0', '>= 0.0.8'
-  gem.add_development_dependency 'rdf-spec',    '~> 3.2'
-  gem.add_development_dependency 'rdf-turtle',  '~> 3.2'
-  gem.add_development_dependency 'rdf-vocab',   '~> 3.2'
-  gem.add_development_dependency 'rdf-xsd',     '~> 3.2', '>= 3.2.1'
+  gem.add_development_dependency 'rdf-spec',    '~> 3.2', '< 3.3'
+  gem.add_development_dependency 'rdf-turtle',  '~> 3.2', '< 3.3'
+  gem.add_development_dependency 'rdf-vocab',   '~> 3.2', '< 3.3'
+  gem.add_development_dependency 'rdf-xsd',     '~> 3.2', '>= 3.2.1', '< 3.3'
   gem.add_development_dependency 'rest-client', '~> 2.1'
   gem.add_development_dependency 'rspec',       '~> 3.12'
   gem.add_development_dependency 'rspec-its',   '~> 1.3'