diff --git a/config/src/main/resources/rinkeby.json b/config/src/main/resources/rinkeby.json
index 0809de27f4d..63769c7a43a 100644
--- a/config/src/main/resources/rinkeby.json
+++ b/config/src/main/resources/rinkeby.json
@@ -9,6 +9,7 @@
     "byzantiumBlock": 1035301,
     "constantinopleBlock": 3660663,
     "constantinopleFixBlock": 4321234,
+    "istanbulBlock":  5435345,
     "clique": {
       "blockperiodseconds": 15,
       "epochlength": 30000
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 ff63da01772..bfb44606a34 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
@@ -131,7 +131,7 @@ public void shouldCreateRinkebyConfig() throws Exception {
     Assertions.assertThat(sched.getByBlockNumber(3_660_663L).getName()).isEqualTo("Constantinople");
     Assertions.assertThat(sched.getByBlockNumber(4_321_234L).getName())
         .isEqualTo("ConstantinopleFix");
-    Assertions.assertThat(sched.getByBlockNumber(Long.MAX_VALUE).getName())
-        .isEqualTo("ConstantinopleFix");
+    Assertions.assertThat(sched.getByBlockNumber(5_435_345L).getName()).isEqualTo("Istanbul");
+    Assertions.assertThat(sched.getByBlockNumber(Long.MAX_VALUE).getName()).isEqualTo("Istanbul");
   }
 }