diff --git a/CHANGELOG.md b/CHANGELOG.md
index 82597c9..f7b44df 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,12 @@ The format is based on [Keep a Changelog], and this project adheres to
 [Keep a Changelog]: https://keepachangelog.com/en/1.0.0/
 [Semantic Versioning]: https://semver.org/spec/v2.0.0.html
 
+## [0.11.1] - 2024-09-27
+
+### Added
+
+- Added JSON struct tags to stub types.
+
 ## [0.11.0] - 2024-09-25
 
 ### Added
@@ -77,6 +83,7 @@ The format is based on [Keep a Changelog], and this project adheres to
 [0.10.2]: https://github.com/dogmatiq/enginekit/releases/v0.10.2
 [0.10.3]: https://github.com/dogmatiq/enginekit/releases/v0.10.3
 [0.11.0]: https://github.com/dogmatiq/enginekit/releases/v0.11.0
+[0.11.1]: https://github.com/dogmatiq/enginekit/releases/v0.11.1
 
 <!-- version template
 ## [0.0.1] - YYYY-MM-DD
diff --git a/enginetest/stubs/aggregate.go b/enginetest/stubs/aggregate.go
index 85eff15..869f1d4 100644
--- a/enginetest/stubs/aggregate.go
+++ b/enginetest/stubs/aggregate.go
@@ -4,7 +4,7 @@ import "github.com/dogmatiq/dogma"
 
 // AggregateRootStub is a test implementation of [dogma.AggregateRoot].
 type AggregateRootStub struct {
-	AppliedEvents  []dogma.Event
+	AppliedEvents  []dogma.Event     `json:"applied_events,omitempty"`
 	ApplyEventFunc func(dogma.Event) `json:"-"`
 }
 
diff --git a/enginetest/stubs/process.go b/enginetest/stubs/process.go
index 30a26c3..1cf32a5 100644
--- a/enginetest/stubs/process.go
+++ b/enginetest/stubs/process.go
@@ -8,7 +8,7 @@ import (
 
 // ProcessRootStub is a test implementation of [dogma.ProcessRoot].
 type ProcessRootStub struct {
-	Value any
+	Value any `json:"value,omitempty"`
 }
 
 var _ dogma.ProcessRoot = &ProcessRootStub{}