diff --git a/gemfiles/activerecord_5.1.gemfile.lock b/gemfiles/activerecord_5.1.gemfile.lock
index d9f178e..2896aa1 100644
--- a/gemfiles/activerecord_5.1.gemfile.lock
+++ b/gemfiles/activerecord_5.1.gemfile.lock
@@ -1,8 +1,8 @@
 PATH
   remote: ..
   specs:
-    parentry (0.4.0)
-      activerecord (~> 5.1.0)
+    parentry (1.0.1)
+      activerecord (~> 5.1)
 
 GEM
   remote: https://rubygems.org/
@@ -105,12 +105,12 @@ DEPENDENCIES
   appraisal
   bundler (~> 1.10)
   combustion (= 0.5.3)
-  database_cleaner
+  database_cleaner (~> 1.6)
   parentry!
-  pg
-  pry
+  pg (~> 0.20)
+  pry (~> 0.10)
   rake (~> 10.0)
-  rspec-rails
+  rspec-rails (~> 3.6)
 
 BUNDLED WITH
    1.14.6
diff --git a/parentry.gemspec b/parentry.gemspec
index f0b1f1c..1bcf0f1 100644
--- a/parentry.gemspec
+++ b/parentry.gemspec
@@ -21,8 +21,8 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'bundler', '~> 1.10'
   spec.add_development_dependency 'rake', '~> 10.0'
   spec.add_development_dependency 'rspec-rails', '~> 3.6'
-  spec.add_development_dependency 'pg', '0.18.3'
+  spec.add_development_dependency 'pg', '~> 0.20'
   spec.add_development_dependency 'combustion', '0.5.3'
-  spec.add_development_dependency 'database_cleaner', '1.5.0'
-  spec.add_development_dependency 'pry', '0.10.3'
+  spec.add_development_dependency 'database_cleaner', '~> 1.6'
+  spec.add_development_dependency 'pry', '~> 0.10'
 end