diff --git a/ethereumkit/src/main/java/io/horizontalsystems/ethereumkit/models/Chain.kt b/ethereumkit/src/main/java/io/horizontalsystems/ethereumkit/models/Chain.kt
index b31fed4b..efa8f212 100644
--- a/ethereumkit/src/main/java/io/horizontalsystems/ethereumkit/models/Chain.kt
+++ b/ethereumkit/src/main/java/io/horizontalsystems/ethereumkit/models/Chain.kt
@@ -12,8 +12,8 @@ enum class Chain(
     Base(8453, 60, 20_000_000, 15, true),
     ZkSync(324, 60, 10_000_000, 15, true),
     Polygon(137, 60, 10_000_000, 15, true),
-    Optimism(10, 60, 10_000_000, 15, false),
-    ArbitrumOne(42161, 60, 10_000_000, 15, false),
+    Optimism(10, 60, 10_000_000, 15, true),
+    ArbitrumOne(42161, 60, 10_000_000, 15, true),
     Avalanche(43114, 60, 10_000_000, 15, true),
     Gnosis(100, 60, 10_000_000, 15, true),
     Fantom(250, 60, 10_000_000, 15, false),