diff --git a/changelog/fragments/1771953472-increase-checkin_limit.max_body_byte_size-default.yaml b/changelog/fragments/1771953472-increase-checkin_limit.max_body_byte_size-default.yaml
new file mode 100644
index 000000000..54a1f39a5
--- /dev/null
+++ b/changelog/fragments/1771953472-increase-checkin_limit.max_body_byte_size-default.yaml
@@ -0,0 +1,45 @@
+# REQUIRED
+# Kind can be one of:
+# - breaking-change: a change to previously-documented behavior
+# - deprecation: functionality that is being removed in a later release
+# - bug-fix: fixes a problem in a previous version
+# - enhancement: extends functionality but does not break or fix existing behavior
+# - feature: new functionality
+# - known-issue: problems that we are aware of in a given version
+# - security: impacts on the security of a product or a user’s deployment.
+# - upgrade: important information for someone upgrading from a prior version
+# - other: does not fit into any of the other categories
+kind: enhancement
+
+# REQUIRED for all kinds
+# Change summary; a 80ish characters long description of the change.
+summary: increase checkin_limit.max_body_byte_size default
+
+# REQUIRED for breaking-change, deprecation, known-issue
+# Long description; in case the summary is not enough to describe the change
+# this field accommodate a description without length limits.
+# description:
+
+# REQUIRED for breaking-change, deprecation, known-issue
+# impact:
+
+# REQUIRED for breaking-change, deprecation, known-issue
+# action:
+
+# REQUIRED for all kinds
+# Affected component; usually one of "elastic-agent", "fleet-server", "filebeat", "metricbeat", "auditbeat", "all", etc.
+component: fleet-server
+
+# AUTOMATED
+# OPTIONAL to manually add other PR URLs
+# PR URL: A link the PR that added the changeset.
+# If not present is automatically filled by the tooling finding the PR where this changelog fragment has been added.
+# NOTE: the tooling supports backports, so it's able to fill the original PR number instead of the backport PR number.
+# Please provide it if you are adding a fragment for a different PR.
+# pr: https://github.com/owner/repo/1234
+
+# AUTOMATED
+# OPTIONAL to manually add other issue URLs
+# Issue URL; optional; the GitHub issue related to this changeset (either closes or is part of).
+# If not present is automatically filled by the tooling with the issue linked to the PR number.
+# issue: https://github.com/owner/repo/1234
diff --git a/fleet-server.reference.yml b/fleet-server.reference.yml
index 5b0d38873..9f27d7e46 100644
--- a/fleet-server.reference.yml
+++ b/fleet-server.reference.yml
@@ -172,7 +172,7 @@ fleet:
 #         interval: 1ms
 #         burst: 1000
 #         max: 0
-#         max_body_byte_size: 1048567 # 1MiB
+#         max_body_byte_size: 2097152 # 2MiB
 #       artifact_limit:
 #         interval: 5ms
 #         burst: 25
diff --git a/internal/pkg/config/env_defaults.go b/internal/pkg/config/env_defaults.go
index fdeebe7c5..22e63945b 100644
--- a/internal/pkg/config/env_defaults.go
+++ b/internal/pkg/config/env_defaults.go
@@ -35,7 +35,7 @@ const (
 	defaultCheckinInterval = time.Millisecond
 	defaultCheckinBurst    = 1000
 	defaultCheckinMax      = 0
-	defaultCheckinMaxBody  = 1024 * 1024
+	defaultCheckinMaxBody  = 1024 * 1024 * 2
 
 	defaultArtifactInterval = time.Millisecond * 5
 	defaultArtifactBurst    = 25