diff --git a/Gemfile.lock b/Gemfile.lock
index 05abbea5..a762a7d6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -244,16 +244,16 @@ GEM
       mini_portile2 (~> 2.4.0)
     orm_adapter (0.5.0)
     parallel (1.19.1)
-    parser (2.6.5.0)
+    parser (2.7.0.1)
       ast (~> 2.4.0)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    pg (1.1.4)
+    pg (1.2.0)
     popper_js (1.14.5)
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    public_suffix (4.0.1)
+    public_suffix (4.0.2)
     puma (4.3.1)
       nio4r (~> 2.0)
     pundit (2.1.0)
@@ -297,7 +297,7 @@ GEM
     rainbow (3.0.0)
     rake (13.0.1)
     rb-fsevent (0.10.3)
-    rb-inotify (0.10.0)
+    rb-inotify (0.10.1)
       ffi (~> 1.0)
     rbnacl (4.0.2)
       ffi
@@ -331,7 +331,7 @@ GEM
       rainbow (>= 2.2.2, < 4.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 1.7)
-    rubocop-rails (2.4.0)
+    rubocop-rails (2.4.1)
       rack (>= 1.1)
       rubocop (>= 0.72.0)
     ruby-enum (0.7.2)
@@ -351,7 +351,7 @@ GEM
       sprockets (> 3.0)
       sprockets-rails
       tilt
-    selenium-webdriver (3.142.6)
+    selenium-webdriver (3.142.7)
       childprocess (>= 0.5, < 4.0)
       rubyzip (>= 1.2.2)
     simpleidn (0.1.1)
@@ -360,7 +360,7 @@ GEM
     spring-watcher-listen (2.0.1)
       listen (>= 2.7, < 4.0)
       spring (>= 1.2, < 3.0)
-    sprockets (3.7.2)
+    sprockets (4.0.0)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.2.1)
@@ -383,7 +383,7 @@ GEM
     turbolinks (5.2.1)
       turbolinks-source (~> 5.2)
     turbolinks-source (5.2.0)
-    tzinfo (1.2.5)
+    tzinfo (1.2.6)
       thread_safe (~> 0.1)
     uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)
diff --git a/Makefile b/Makefile
index f420e73f..84006b5b 100644
--- a/Makefile
+++ b/Makefile
@@ -12,8 +12,7 @@ build:
 	docker build --build-arg="RAILS_MASTER_KEY=`cat config/master.key`" -t sutty/sutty .
 
 save:
-	docker save sutty/sutty:latest | gzip > sutty.latest.gz
-	scp sutty.latest.gz root@sutty.nl:
+	docker save sutty/sutty:latest | gzip | ssh root@sutty.nl docker load
 
 load:
 	ssh root@sutty.nl sh -c "gunzip -c sutty.latest.gz | docker load"
@@ -24,7 +23,7 @@ load:
 
 gem_dir := $(shell readlink -f ../gems)
 gems := $(shell bundle show --paths | xargs -I {} sh -c 'test -f {}/ext/*/extconf.rb && basename {}')
-gems += $(shell bundle show --paths | xargs -I {} sh -c 'find {} -name extconf.rb && basename {}')
+gems += $(shell bundle show --paths | xargs -I {} sh -c 'test -f {}/ext/extconf.rb && basename {}')
 gems_musl := $(patsubst %,$(gem_dir)/%-x86_64-linux-musl.gem,$(gems))
 
 $(gem_dir)/%-x86_64-linux-musl.gem:
@@ -53,8 +52,8 @@ test-container: $(dirs)
 	           -v $(PWD)/root/public:/srv/http/_public \
 	           -v $(PWD)/config/credentials.yml.enc:/srv/http/config/credentials.yml.enc \
 	           -e RAILS_MASTER_KEY=`cat config/master.key` \
+						 -e RAILS_ENV=production \
 						 -it \
 	           --rm \
 	           --name=sutty \
-	           sutty/sutty \
-						 /bin/sh
+	           sutty/sutty /bin/sh