diff --git a/config/src/main/resources/ropsten.json b/config/src/main/resources/ropsten.json
index 710f15acc9d..0cb152fe0a7 100644
--- a/config/src/main/resources/ropsten.json
+++ b/config/src/main/resources/ropsten.json
@@ -8,6 +8,7 @@
     "byzantiumBlock": 1700000,
     "constantinopleBlock": 4230000,
     "constantinopleFixBlock": 4939394,
+    "istanbulBlock": 6485846,
     "ethash": {
     }
   },
diff --git a/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/mainnet/MainnetProtocolScheduleTest.java b/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/mainnet/MainnetProtocolScheduleTest.java
index ee1b025698f..9be3135a2b9 100644
--- a/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/mainnet/MainnetProtocolScheduleTest.java
+++ b/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/mainnet/MainnetProtocolScheduleTest.java
@@ -91,13 +91,14 @@ public void shouldCreateRopstenConfig() throws Exception {
                     Resources.toString(
                         this.getClass().getResource("/ropsten.json"), StandardCharsets.UTF_8))
                 .getConfigOptions());
-    Assertions.assertThat(sched.getByBlockNumber(0).getName()).isEqualTo("TangerineWhistle");
-    Assertions.assertThat(sched.getByBlockNumber(1).getName()).isEqualTo("TangerineWhistle");
-    Assertions.assertThat(sched.getByBlockNumber(10).getName()).isEqualTo("SpuriousDragon");
-    Assertions.assertThat(sched.getByBlockNumber(1700000).getName()).isEqualTo("Byzantium");
-    Assertions.assertThat(sched.getByBlockNumber(4230000).getName()).isEqualTo("Constantinople");
-    Assertions.assertThat(sched.getByBlockNumber(4939394).getName()).isEqualTo("ConstantinopleFix");
-    Assertions.assertThat(sched.getByBlockNumber(Long.MAX_VALUE).getName())
+    Assertions.assertThat(sched.getByBlockNumber(0L).getName()).isEqualTo("TangerineWhistle");
+    Assertions.assertThat(sched.getByBlockNumber(1L).getName()).isEqualTo("TangerineWhistle");
+    Assertions.assertThat(sched.getByBlockNumber(10L).getName()).isEqualTo("SpuriousDragon");
+    Assertions.assertThat(sched.getByBlockNumber(1_700_000L).getName()).isEqualTo("Byzantium");
+    Assertions.assertThat(sched.getByBlockNumber(4_230_000L).getName()).isEqualTo("Constantinople");
+    Assertions.assertThat(sched.getByBlockNumber(4_939_394L).getName())
         .isEqualTo("ConstantinopleFix");
+    Assertions.assertThat(sched.getByBlockNumber(6_485_846L).getName()).isEqualTo("Istanbul");
+    Assertions.assertThat(sched.getByBlockNumber(Long.MAX_VALUE).getName()).isEqualTo("Istanbul");
   }
 }