diff --git a/CHANGELOG.md b/CHANGELOG.md
index 830f087e..e46b399b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 4.10.1
+
+- Fix an object ownership/sharing bug where the Rails log level was erroneously being set to `WARN` when initialising Sentry.
+
 # 4.10.0
 
 - Reduce log level for the Sentry gem from `INFO` to `WARN` to avoid polluting logs with uninformative messages. This only affects log messages from the Sentry gem itself, which go to `stdout`.
diff --git a/lib/govuk_app_config/govuk_error.rb b/lib/govuk_app_config/govuk_error.rb
index d8adc748..e1d98076 100644
--- a/lib/govuk_app_config/govuk_error.rb
+++ b/lib/govuk_app_config/govuk_error.rb
@@ -40,8 +40,6 @@ def self.configure
 
     Sentry.init do |sentry_config|
       config = Configuration.new(sentry_config)
-      # Avoid "Sending envelope with items ... to Sentry" logspew on stdout.
-      config.logger.level = Sentry::Logger::WARN
       yield config if block_given?
     end
   end
diff --git a/lib/govuk_app_config/govuk_error/configuration.rb b/lib/govuk_app_config/govuk_error/configuration.rb
index 135ab407..c8abd1f7 100644
--- a/lib/govuk_app_config/govuk_error/configuration.rb
+++ b/lib/govuk_app_config/govuk_error/configuration.rb
@@ -74,6 +74,10 @@ def set_up_defaults
         "GdsApi::ContentStore::ItemNotFound",
       ]
 
+      # Avoid "Sending envelope with items ... to Sentry" logspew, since we
+      # don't use Sentry's automatic session tracking.
+      self.auto_session_tracking = false
+
       @before_send_callbacks = [
         ignore_excluded_exceptions_in_data_sync,
         increment_govuk_statsd_counters,
diff --git a/lib/govuk_app_config/version.rb b/lib/govuk_app_config/version.rb
index c3d37d7a..5fcd1025 100644
--- a/lib/govuk_app_config/version.rb
+++ b/lib/govuk_app_config/version.rb
@@ -1,3 +1,3 @@
 module GovukAppConfig
-  VERSION = "4.10.0".freeze
+  VERSION = "4.10.1".freeze
 end