diff --git a/internal/history/release.go b/internal/history/release.go
index 1d6965e..63a5368 100644
--- a/internal/history/release.go
+++ b/internal/history/release.go
@@ -31,6 +31,19 @@
 // It contains entries for releases of Go 1.9 and newer.
 // Older releases are listed in doc/devel/release.html.
 var Releases = map[GoVer]Release{
+	{1, 16, 3}: {
+		Date: Date{2021, 4, 1},
+
+		Components: []template.HTML{"the compiler", "linker", "runtime", "the <code>go</code> command"},
+		Packages:   []string{"testing", "time"},
+	},
+	{1, 15, 11}: {
+		Date: Date{2021, 4, 1},
+
+		Components: []template.HTML{"cgo", "the compiler", "linker", "runtime", "the <code>go</code> command"},
+		Packages:   []string{"database/sql", "net/http"},
+	},
+
 	{1, 16, 2}: {
 		Date: Date{2021, 3, 11},