diff --git a/sdk/build_release.go b/sdk/build_release.go
index 149a34e..e728afe 100644
--- a/sdk/build_release.go
+++ b/sdk/build_release.go
@@ -100,6 +100,7 @@
 	// Add the dessert build releases from oldest to newest.
 	buildReleaseS = initBuildRelease("S")
 	buildReleaseT = initBuildRelease("Tiramisu")
+	buildReleaseU = initBuildRelease("UpsideDownCake")
 
 	// Add the current build release which is always treated as being more recent than any other
 	// build release, including those added in tests.
diff --git a/sdk/build_release_test.go b/sdk/build_release_test.go
index 13730cb..5bf57b5 100644
--- a/sdk/build_release_test.go
+++ b/sdk/build_release_test.go
@@ -42,7 +42,7 @@
 		android.AssertDeepEquals(t, "release", (*buildRelease)(nil), release)
 		// Uses a wildcard in the error message to allow for additional build releases to be added to
 		// the supported set without breaking this test.
-		android.FailIfNoMatchingErrors(t, `unknown release "A", expected one of \[S,Tiramisu,F1,F2,current\]`, []error{err})
+		android.FailIfNoMatchingErrors(t, `unknown release "A", expected one of \[S,Tiramisu,UpsideDownCake,F1,F2,current\]`, []error{err})
 	})
 }
 
@@ -60,7 +60,7 @@
 	t.Run("closed range", func(t *testing.T) {
 		set, err := parseBuildReleaseSet("S-F1")
 		android.AssertDeepEquals(t, "errors", nil, err)
-		android.AssertStringEquals(t, "set", "[S,Tiramisu,F1]", set.String())
+		android.AssertStringEquals(t, "set", "[S,Tiramisu,UpsideDownCake,F1]", set.String())
 	})
 	invalidAReleaseMessage := `unknown release "A", expected one of ` + allBuildReleaseSet.String()
 	t.Run("invalid release", func(t *testing.T) {