diff --git a/src/settings.cpp b/src/settings.cpp
index 71fb72a98..bb8b3221f 100644
--- a/src/settings.cpp
+++ b/src/settings.cpp
@@ -151,8 +151,9 @@ settings::settings(chain::selection context) NOEXCEPT
             break;
         }
 
-        // Sized for the chain at 150,000 blocks.
+        // Sized for the testnet4 chain at 150,000 blocks.
         case chain::selection::testnet4:
+        case chain::selection::testnet5:
         {
             header.expected = 156'456;
             header.size = 17'835'984;
diff --git a/test/settings.cpp b/test/settings.cpp
index bd9972081..43f1b3ede 100644
--- a/test/settings.cpp
+++ b/test/settings.cpp
@@ -247,4 +247,30 @@ BC_AUTO_TEST_CASE(settings__construct__signet__expected)
     BC_REQUIRE_EQUAL(configuration.turbo, true);
 }
 
+BC_AUTO_TEST_CASE(settings__construct__testnet5__expected)
+{
+    database::settings configuration{ system::chain::selection::testnet5 };
+    BC_REQUIRE(configuration.network == system::chain::selection::testnet5);
+    BC_REQUIRE_EQUAL(configuration.path, "testnet5");
+    BC_REQUIRE_EQUAL(configuration.header.expected, 156'456u);
+    BC_REQUIRE_EQUAL(configuration.header.size, 17'835'984u);
+    BC_REQUIRE_EQUAL(configuration.txs.buckets, 150'001u);
+    BC_REQUIRE_EQUAL(configuration.txs.size, 604'424u);
+    BC_REQUIRE_EQUAL(configuration.tx.expected, 14'810'011u);
+    BC_REQUIRE_EQUAL(configuration.tx.size, 9'478'407u);
+    BC_REQUIRE_EQUAL(configuration.ins.expected, 33'127'580u);
+    BC_REQUIRE_EQUAL(configuration.ins.size, 17'226'342u);
+    BC_REQUIRE_EQUAL(configuration.outs.expected, 57'089'349u);
+    BC_REQUIRE_EQUAL(configuration.outs.size, 5'138'041u);
+    BC_REQUIRE_EQUAL(configuration.input.size, 87'852'864u);
+    BC_REQUIRE_EQUAL(configuration.output.size, 20'343'818u);
+    BC_REQUIRE_EQUAL(configuration.candidate.buckets, 150'001u);
+    BC_REQUIRE_EQUAL(configuration.confirmed.buckets, 150'001u);
+    BC_REQUIRE_EQUAL(configuration.strong.buckets, 14'810'011u);
+    BC_REQUIRE_EQUAL(configuration.scan.buckets, 150'001u);
+    BC_REQUIRE_EQUAL(configuration.state.buckets, 150'001u);
+    BC_REQUIRE_EQUAL(configuration.interval_depth, 11u);
+    BC_REQUIRE_EQUAL(configuration.turbo, true);
+}
+
 BC_AUTO_TEST_SUITE_END()
diff --git a/test/tables/envelope.cpp b/test/tables/envelope.cpp
index bb155e9d9..5d188ea05 100644
--- a/test/tables/envelope.cpp
+++ b/test/tables/envelope.cpp
@@ -340,6 +340,19 @@ BC_AUTO_TEST_CASE(envelope__from_data__testnet4__round_trip_network)
     BC_REQUIRE(out.network == chain::selection::testnet4);
 }
 
+BC_AUTO_TEST_CASE(envelope__from_data__testnet5__round_trip_network)
+{
+    const system::settings bitcoin{ chain::selection::testnet5 };
+    const database::settings configuration{ test::database_settings() };
+    const envelope instance{ bitcoin, configuration, false, 42 };
+    auto data = to_chunk(instance);
+    BC_REQUIRE_EQUAL(data.size(), instance.serialized_size());
+
+    envelope out{};
+    BC_REQUIRE(from_chunk(out, data));
+    BC_REQUIRE(out.network == chain::selection::testnet5);
+}
+
 BC_AUTO_TEST_CASE(envelope__apply__unprovided_filters__unbucketed)
 {
     system::settings bitcoin{ chain::selection::mainnet };