diff --git a/internal/agentplugin/compat.go b/internal/agentplugin/compat.go
index ea009411..8c31336d 100644
--- a/internal/agentplugin/compat.go
+++ b/internal/agentplugin/compat.go
@@ -14,8 +14,8 @@ const (
 	// install says which release a report comes from.
 	PluginVersionFloor = "0.13.0"
 	// PluginVersionCeiling is the first release past the newest contract this
-	// lich implements (0.20), and the first one it cannot vouch for.
-	PluginVersionCeiling = "0.21.0"
+	// lich implements (0.21), and the first one it cannot vouch for.
+	PluginVersionCeiling = "0.22.0"
 	// ModAnswerRelease is the first release whose mod answers a subagent
 	// worker's errand itself (docs/hooks/mod-answer.md).
 	ModAnswerRelease = "0.17.0"
diff --git a/internal/agentplugin/compat_test.go b/internal/agentplugin/compat_test.go
index 3c950a60..d85fae21 100644
--- a/internal/agentplugin/compat_test.go
+++ b/internal/agentplugin/compat_test.go
@@ -18,7 +18,8 @@ func TestCompatible(t *testing.T) {
 		"0.18.0":       true,
 		"0.19.0":       true,
 		"0.20.0":       true,
-		"0.21.0":       false,
+		"0.21.0":       true,
+		"0.22.0":       false,
 		"1.0.0":        false,
 		"":             false,
 		"not-a-semver": false,
@@ -36,9 +37,9 @@ func TestNewestCompatible(t *testing.T) {
 		tags []string
 		want string
 	}{
-		{"newest in range wins over a newer one past it", []string{"0.21.0", "0.13.2", "0.13.10", "0.12.9"}, "0.13.10"},
+		{"newest in range wins over a newer one past it", []string{"0.22.0", "0.13.2", "0.13.10", "0.12.9"}, "0.13.10"},
 		{"order does not matter", []string{"0.13.0", "0.13.1"}, "0.13.1"},
-		{"nothing in range", []string{"0.21.0", "0.12.0"}, ""},
+		{"nothing in range", []string{"0.22.0", "0.12.0"}, ""},
 		{"no releases", nil, ""},
 	}
 	for _, tc := range tests {