diff --git a/Gemfile b/Gemfile
index 7859da6c..427fe987 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,8 +5,8 @@ group :development do
   gem 'rspec', '~> 3.1'
 
   unless ENV['NO_ACTIVERECORD']
-    gem 'activerecord', '~> 3.2.3'
-    gem 'activerecord-oracle_enhanced-adapter', '~> 1.4.1'
+    gem 'activerecord', '>= 3.2.3', '< 4.2.0'
+    gem 'activerecord-oracle_enhanced-adapter', '>= 1.4.1', '< 1.6.0'
   end
 
   platforms :ruby do
diff --git a/ruby-plsql.gemspec b/ruby-plsql.gemspec
index cdd37a1b..86222caa 100644
--- a/ruby-plsql.gemspec
+++ b/ruby-plsql.gemspec
@@ -66,21 +66,21 @@ Gem::Specification.new do |s|
     if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then
       s.add_development_dependency(%q<jeweler>, ["~> 1.8.3"])
       s.add_development_dependency(%q<rspec>, ["~> 3.1"])
-      s.add_development_dependency(%q<activerecord>, ["~> 3.2.3"])
-      s.add_development_dependency(%q<activerecord-oracle_enhanced-adapter>, ["~> 1.4.1"])
+      s.add_development_dependency(%q<activerecord>, [">= 3.2.3", "< 4.2.0"])
+      s.add_development_dependency(%q<activerecord-oracle_enhanced-adapter>, [">= 1.4.1", "< 1.6.0"])
       s.add_development_dependency(%q<ruby-oci8>, [">= 0"])
     else
       s.add_dependency(%q<jeweler>, ["~> 1.8.3"])
       s.add_dependency(%q<rspec>, ["~> 3.1"])
-      s.add_dependency(%q<activerecord>, ["~> 3.2.3"])
-      s.add_dependency(%q<activerecord-oracle_enhanced-adapter>, ["~> 1.4.1"])
+      s.add_dependency(%q<activerecord>, [">= 3.2.3", "< 4.2.0"])
+      s.add_dependency(%q<activerecord-oracle_enhanced-adapter>, [">= 1.4.1", "< 1.6.0"])
       s.add_dependency(%q<ruby-oci8>, [">= 0"])
     end
   else
     s.add_dependency(%q<jeweler>, ["~> 1.8.3"])
     s.add_dependency(%q<rspec>, ["~> 3.1"])
-    s.add_dependency(%q<activerecord>, ["~> 3.2.3"])
-    s.add_dependency(%q<activerecord-oracle_enhanced-adapter>, ["~> 1.4.1"])
+    s.add_dependency(%q<activerecord>, [">= 3.2.3", "< 4.2.0"])
+    s.add_dependency(%q<activerecord-oracle_enhanced-adapter>, [">= 1.4.1", "< 1.6.0"])
     s.add_dependency(%q<ruby-oci8>, [">= 0"])
   end
 end