diff --git a/apiv2/pkg/clients/project/project.go b/apiv2/pkg/clients/project/project.go
index 04606dc6..188887ae 100644
--- a/apiv2/pkg/clients/project/project.go
+++ b/apiv2/pkg/clients/project/project.go
@@ -3,7 +3,6 @@ package project
 import (
 	"context"
 	goerr "errors"
-
 	projectapi "github.com/mittwald/goharbor-client/v5/apiv2/internal/api/client/project"
 	"github.com/mittwald/goharbor-client/v5/apiv2/pkg/config"
 	"github.com/mittwald/goharbor-client/v5/apiv2/pkg/errors"
@@ -109,12 +108,13 @@ func (c *RESTClient) GetProject(ctx context.Context, nameOrID string) (*model.Pr
 
 	resp, err := c.V2Client.Project.GetProject(params, c.AuthInfo)
 	if err != nil {
-		if resp == nil {
-			return nil, &errors.ErrProjectNotFound{}
-		}
 		return nil, handleSwaggerProjectErrors(err)
 	}
 
+	if resp == nil {
+		return nil, &errors.ErrProjectNotFound{}
+	}
+
 	return resp.Payload, nil
 }
 
diff --git a/apiv2/pkg/clients/project/project_errors.go b/apiv2/pkg/clients/project/project_errors.go
index 062b0449..79465266 100644
--- a/apiv2/pkg/clients/project/project_errors.go
+++ b/apiv2/pkg/clients/project/project_errors.go
@@ -27,7 +27,7 @@ func handleSwaggerProjectErrors(in error) error {
 		case http.StatusForbidden:
 			return &errors.ErrProjectNoPermission{}
 		case http.StatusNotFound:
-			return &errors.ErrProjectUnknownResource{}
+			return &errors.ErrProjectNotFound{}
 		case http.StatusInternalServerError:
 			return &errors.ErrProjectInternalErrors{}
 		}
diff --git a/apiv2/pkg/clients/retention/retention.go b/apiv2/pkg/clients/retention/retention.go
index 2b4a10e2..7848ad2c 100644
--- a/apiv2/pkg/clients/retention/retention.go
+++ b/apiv2/pkg/clients/retention/retention.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	clienterrors "github.com/mittwald/goharbor-client/v5/apiv2/pkg/errors"
 	"strconv"
 
 	"github.com/go-openapi/runtime"
@@ -186,15 +187,14 @@ func (c *RESTClient) UpdateRetentionPolicy(ctx context.Context, ret *modelv2.Ret
 	params.WithTimeout(c.Options.Timeout)
 
 	resp, err := c.V2Client.Retention.UpdateRetention(params, c.AuthInfo)
-
-	if resp == nil {
-		return &ErrRetentionDoesNotExist{}
-	}
-
 	if err != nil {
 		return handleSwaggerRetentionErrors(err)
 	}
 
+	if resp == nil {
+		return &clienterrors.ErrNotFound{}
+	}
+
 	return nil
 }