diff --git a/Gemfile.lock b/Gemfile.lock
index bc3d4f3e2..7c85e5928 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -122,9 +122,10 @@ GEM
       activesupport (>= 4.2.0)
     govuk-content-schema-test-helpers (1.6.1)
       json-schema (~> 2.8.0)
-    govuk_app_config (3.3.0)
+    govuk_app_config (4.0.0)
       logstasher (>= 1.2.2, < 2.2.0)
-      sentry-raven (~> 3.1.1)
+      sentry-rails (~> 4.5.0)
+      sentry-ruby (~> 4.5.0)
       statsd-ruby (~> 1.5.0)
       unicorn (>= 5.4, < 5.9)
     govuk_publishing_components (24.21.1)
@@ -302,8 +303,16 @@ GEM
     selenium-webdriver (3.142.7)
       childprocess (>= 0.5, < 4.0)
       rubyzip (>= 1.2.2)
-    sentry-raven (3.1.2)
+    sentry-rails (4.5.2)
+      railties (>= 5.0)
+      sentry-ruby-core (~> 4.5.0)
+    sentry-ruby (4.5.2)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
       faraday (>= 1.0)
+      sentry-ruby-core (= 4.5.2)
+    sentry-ruby-core (4.5.2)
+      concurrent-ruby
+      faraday
     shoulda-context (2.0.0)
     simplecov (0.19.0)
       docile (~> 1.1)