diff --git a/bin/dev b/bin/dev
index 06fccb37..20dee8d5 100755
--- a/bin/dev
+++ b/bin/dev
@@ -5,5 +5,9 @@ if ! gem list foreman -i --silent; then
   gem install foreman
 fi
 
+if ! test -d sandbox; then
+  bin/sandbox
+fi
+
 export PORT=3000
 exec foreman start -f Procfile.dev "$@"
diff --git a/bin/rspec b/bin/rspec
index 42bc6a1e..175c3fb7 100755
--- a/bin/rspec
+++ b/bin/rspec
@@ -5,6 +5,6 @@ system(
   err: :out,
 ) or abort(File.read("tmp/rspec-sync.log"))
 
-system("bin/update-migrations", "dummy-app")
+system("bin/update-migrations", "dummy-app") unless ENV['CI']
 Dir.chdir "dummy-app/"
 exec "bundle", "exec", "rspec", *ARGV
diff --git a/bin/update-migrations b/bin/update-migrations
index a0f90293..adf98827 100755
--- a/bin/update-migrations
+++ b/bin/update-migrations
@@ -16,7 +16,7 @@ Dir["#{app}/db/migrate/*.#{extension_name}.rb"].sort.reverse_each do |path|
   if current_migrations[basename]
     if contents != File.read(current_migrations[basename])
       puts "rolling back #{basename}..."
-      Dir.chdir(app) { system("bin/rails db:rollback VERSION=#{timestamp}") }
+      Dir.chdir(app) { system("bin/rails db:migrate:down VERSION=#{timestamp}") }
       puts "updating #{basename}..."
       File.write(path, File.read(current_migrations[basename]))
     else
@@ -32,9 +32,10 @@ Dir["#{app}/db/migrate/*.#{extension_name}.rb"].sort.reverse_each do |path|
 end
 
 # Install missing migrations
-current_migrations.each do |basename, path|
+base_time = Time.now.utc.to_i
+current_migrations.reverse_each.with_index do |(basename, path), index|
   puts "installing #{basename}..."
-  timestamp = Time.now.utc.strftime("%F%T").delete('-:')
+  timestamp = Time.at(base_time + index).strftime("%F%T").delete('-:') # rubocop:disable Rails/TimeZone
   contents = File.read(path)
 
   File.write("#{app}/db/migrate/#{timestamp}_#{basename}.#{extension_name}.rb", contents)