diff --git a/Gemfile.lock b/Gemfile.lock
index d099dcb4a..b4b1ce315 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -111,11 +111,11 @@ GEM
     globalid (0.4.2)
       activesupport (>= 4.2.0)
     govuk_ab_testing (2.4.2)
-    govuk_app_config (2.3.0)
+    govuk_app_config (2.4.0)
       logstasher (>= 1.2.2, < 1.4.0)
       sentry-raven (>= 2.7.1, < 3.1.0)
       statsd-ruby (~> 1.4.0)
-      unicorn (>= 5.4, < 5.7)
+      unicorn (>= 5.4, < 5.8)
     govuk_publishing_components (21.68.1)
       govuk_app_config
       kramdown
@@ -341,7 +341,7 @@ GEM
       unf_ext
     unf_ext (0.0.7.7)
     unicode-display_width (1.7.0)
-    unicorn (5.6.0)
+    unicorn (5.7.0)
       kgio (~> 2.6)
       raindrops (~> 0.7)
     webdrivers (4.4.1)