diff --git a/lib/datadog/ci/transport/event_platform_transport.rb b/lib/datadog/ci/transport/event_platform_transport.rb
index a3ceb482..13f42521 100644
--- a/lib/datadog/ci/transport/event_platform_transport.rb
+++ b/lib/datadog/ci/transport/event_platform_transport.rb
@@ -11,7 +11,7 @@ module Datadog
   module CI
     module Transport
       class EventPlatformTransport
-        DEFAULT_MAX_PAYLOAD_SIZE = 5 * 1024 * 1024
+        DEFAULT_MAX_PAYLOAD_SIZE = 4.5 * 1024 * 1024
 
         attr_reader :api,
           :max_payload_size
diff --git a/sig/datadog/ci/transport/event_platform_transport.rbs b/sig/datadog/ci/transport/event_platform_transport.rbs
index ada13d1d..bacdc1df 100644
--- a/sig/datadog/ci/transport/event_platform_transport.rbs
+++ b/sig/datadog/ci/transport/event_platform_transport.rbs
@@ -2,15 +2,15 @@ module Datadog
   module CI
     module Transport
       class EventPlatformTransport
-        DEFAULT_MAX_PAYLOAD_SIZE: Integer
+        DEFAULT_MAX_PAYLOAD_SIZE: Numeric
 
         attr_reader api: Datadog::CI::Transport::Api::Base
-        attr_reader max_payload_size: Integer
+        attr_reader max_payload_size: Numeric
 
         @api: Datadog::CI::Transport::Api::Base
-        @max_payload_size: Integer
+        @max_payload_size: Numeric
 
-        def initialize: (api: Datadog::CI::Transport::Api::Base, ?max_payload_size: Integer) -> void
+        def initialize: (api: Datadog::CI::Transport::Api::Base, ?max_payload_size: Numeric) -> void
 
         def send_events: (Array[untyped] events) -> ::Array[Datadog::CI::Transport::Adapters::Net::Response]