diff --git a/coordinator/coordapi.go b/coordinator/coordapi.go
index a9d79ca29..89dac488a 100644
--- a/coordinator/coordapi.go
+++ b/coordinator/coordapi.go
@@ -72,9 +72,7 @@ func (s *coordAPIServer) SetManifest(_ context.Context, req *coordapi.SetManifes
 		s.policyTextStore.Set(policy.Hash(), policy)
 	}
 
-	if err := s.manifSetGetter.SetManifest(m); err != nil {
-		return nil, status.Errorf(codes.Internal, "setting manifest: %v", err)
-	}
+	s.manifSetGetter.SetManifest(m)
 
 	resp := &coordapi.SetManifestResponse{
 		CACert:     s.caChainGetter.GetRootCACert(),
@@ -137,7 +135,7 @@ type certChainGetter interface {
 }
 
 type manifestSetGetter interface {
-	SetManifest(*manifest.Manifest) error
+	SetManifest(*manifest.Manifest)
 	GetManifests() []*manifest.Manifest
 }
 
diff --git a/coordinator/mesh.go b/coordinator/mesh.go
index 1dad23b68..1851bdedb 100644
--- a/coordinator/mesh.go
+++ b/coordinator/mesh.go
@@ -24,7 +24,7 @@ type meshAuthority struct {
 	ca        *ca.CA
 	certs     map[string][]byte
 	certsMux  sync.RWMutex
-	manifests appendableList[manifest.Manifest]
+	manifests appendableList[*manifest.Manifest]
 	logger    *slog.Logger
 }
 
@@ -32,7 +32,7 @@ func newMeshAuthority(ca *ca.CA, log *slog.Logger) *meshAuthority {
 	return &meshAuthority{
 		ca:        ca,
 		certs:     make(map[string][]byte),
-		manifests: new(appendable.Appendable[manifest.Manifest]),
+		manifests: new(appendable.Appendable[*manifest.Manifest]),
 		logger:    log.WithGroup("mesh-authority"),
 	}
 }
@@ -129,12 +129,12 @@ func (m *meshAuthority) GetManifests() []*manifest.Manifest {
 	return m.manifests.All()
 }
 
-func (m *meshAuthority) SetManifest(mnfst *manifest.Manifest) error {
-	return m.manifests.Append(mnfst)
+func (m *meshAuthority) SetManifest(mnfst *manifest.Manifest) {
+	m.manifests.Append(mnfst)
 }
 
 type appendableList[T any] interface {
-	Append(*T) error
-	All() []*T
-	Latest() (*T, error)
+	Append(T)
+	All() []T
+	Latest() (T, error)
 }
diff --git a/internal/appendable/appendable.go b/internal/appendable/appendable.go
index 4a2e02cfa..dd9772788 100644
--- a/internal/appendable/appendable.go
+++ b/internal/appendable/appendable.go
@@ -2,41 +2,36 @@ package appendable
 
 import (
 	"errors"
-	"fmt"
 	"sync"
 )
 
 // Appendable is a thread-safe list that can be appended to.
 type Appendable[T any] struct {
-	list []*T
+	list []T
 	mux  sync.RWMutex
 }
 
 // Append adds a value to the list.
-func (a *Appendable[T]) Append(value *T) error {
-	if value == nil {
-		return fmt.Errorf("nil value of type %T cannot be appended", value)
-	}
+func (a *Appendable[T]) Append(value T) {
 	a.mux.Lock()
 	defer a.mux.Unlock()
 	a.list = append(a.list, value)
-	return nil
 }
 
 // All returns all values in the list.
-func (a *Appendable[T]) All() []*T {
+func (a *Appendable[T]) All() []T {
 	a.mux.RLock()
 	defer a.mux.RUnlock()
 	return a.list
 }
 
 // Latest returns the latest value in the list.
-func (a *Appendable[T]) Latest() (*T, error) {
+func (a *Appendable[T]) Latest() (T, error) {
 	a.mux.RLock()
 	defer a.mux.RUnlock()
 
 	if len(a.list) == 0 {
-		return nil, errors.New("appendable is empty")
+		return *new(T), errors.New("appendable is empty")
 	}
 
 	return a.list[len(a.list)-1], nil
diff --git a/internal/appendable/appendable_test.go b/internal/appendable/appendable_test.go
new file mode 100644
index 000000000..28a151210
--- /dev/null
+++ b/internal/appendable/appendable_test.go
@@ -0,0 +1,106 @@
+package appendable_test
+
+import (
+	"sync"
+	"testing"
+
+	"github.com/edgelesssys/nunki/internal/appendable"
+	"github.com/stretchr/testify/assert"
+	"go.uber.org/goleak"
+)
+
+func TestMain(m *testing.M) {
+	goleak.VerifyTestMain(m)
+}
+
+func TestAppendable(t *testing.T) {
+	t.Run("new appendable is empty", func(t *testing.T) {
+		assert := assert.New(t)
+
+		a := appendable.Appendable[string]{}
+		assert.Empty(a.All())
+	})
+
+	t.Run("append and all", func(t *testing.T) {
+		assert := assert.New(t)
+
+		a := appendable.Appendable[string]{}
+		a.Append("foo")
+		a.Append("bar")
+
+		values := a.All()
+		assert.Len(values, 2)
+		assert.Contains(values, "foo")
+		assert.Contains(values, "bar")
+	})
+
+	t.Run("latest", func(t *testing.T) {
+		assert := assert.New(t)
+
+		a := appendable.Appendable[string]{}
+		a.Append("foo")
+		a.Append("bar")
+
+		v, err := a.Latest()
+		assert.NoError(err)
+		assert.EqualValues("bar", v)
+	})
+
+	t.Run("latest empty", func(t *testing.T) {
+		assert := assert.New(t)
+
+		a := appendable.Appendable[string]{}
+		_, err := a.Latest()
+		assert.Error(err)
+	})
+}
+
+func TestAppendableConcurrent(t *testing.T) {
+	t.Run("append all latest", func(t *testing.T) {
+		assert := assert.New(t)
+
+		a := appendable.Appendable[string]{}
+
+		var wg sync.WaitGroup
+
+		appendElem := func(e string) {
+			defer wg.Done()
+			a.Append(e)
+		}
+		all := func() {
+			defer wg.Done()
+			_ = a.All()
+		}
+		latest := func() {
+			defer wg.Done()
+			_, _ = a.Latest()
+		}
+
+		wg.Add(18)
+		go latest()
+		go latest()
+		go latest()
+		go appendElem("foo")
+		go appendElem("bar")
+		go appendElem("baz")
+		go all()
+		go all()
+		go all()
+		go appendElem("foo")
+		go appendElem("bar")
+		go appendElem("baz")
+		go latest()
+		go latest()
+		go latest()
+		go all()
+		go all()
+		go all()
+		wg.Wait()
+
+		values := a.All()
+		assert.Len(values, 6)
+		assert.Contains(values, "foo")
+		assert.Contains(values, "bar")
+		assert.Contains(values, "baz")
+	})
+}