diff --git a/Retesteth/default/config b/Retesteth/default/config
index b9b1d3a2785..f204351f5fb 100644
--- a/Retesteth/default/config
+++ b/Retesteth/default/config
@@ -18,6 +18,7 @@
                 "EIP158",
                 "Byzantium",
                 "Constantinople",
-                "ConstantinopleFix"
+                "ConstantinopleFix",
+                "Istanbul"
         ]
 }
diff --git a/Retesteth/default/genesis/correctMiningReward.json b/Retesteth/default/genesis/correctMiningReward.json
index 2517e9633bf..66aa57cd4ec 100644
--- a/Retesteth/default/genesis/correctMiningReward.json
+++ b/Retesteth/default/genesis/correctMiningReward.json
@@ -6,5 +6,6 @@
     "EIP158":            "5000000000000000000",
     "Byzantium":         "3000000000000000000",
     "Constantinople":    "2000000000000000000",
-    "ConstantinopleFix": "2000000000000000000"
+    "ConstantinopleFix": "2000000000000000000",
+    "Istanbul":			 "2000000000000000000"
 }
diff --git a/Retesteth/gethTCP/config b/Retesteth/gethTCP/config
index b9b1d3a2785..f204351f5fb 100644
--- a/Retesteth/gethTCP/config
+++ b/Retesteth/gethTCP/config
@@ -18,6 +18,7 @@
                 "EIP158",
                 "Byzantium",
                 "Constantinople",
-                "ConstantinopleFix"
+                "ConstantinopleFix",
+                "Istanbul"
         ]
 }