diff --git a/generator/activities/activities.go b/generator/activities/activities.go
index daf79df..0a514d0 100644
--- a/generator/activities/activities.go
+++ b/generator/activities/activities.go
@@ -81,7 +81,7 @@ func (a *Activities) Get(ctx context.Context, w io.Writer, usernames []string, s
 	cbs := []source.PullRequestCallback{}
 	if !last.IsZero() {
 		cbs = append(cbs, func(pr *source.PullRequest) bool {
-			return pr.CreatedAt.After(last)
+			return pr.MergedAt.After(last)
 		})
 	}
 
diff --git a/generator/charts/charts.go b/generator/charts/charts.go
index 995957d..939cb03 100644
--- a/generator/charts/charts.go
+++ b/generator/charts/charts.go
@@ -125,7 +125,7 @@ func (a *Charts) Get(ctx context.Context, w io.Writer, title string, usernames [
 	for i, username := range usernames {
 		prs, err := a.source.PullRequests(ctx, username,
 			states,
-			source.IssueOrderFieldCreatedAt, source.OrderDirectionDesc, size,
+			source.IssueOrderFieldUpdatedAt, source.OrderDirectionDesc, size,
 			cbs...)
 		if err != nil {
 			return fmt.Errorf("list PullRequests %q: %w", username, err)