diff --git a/src/main/java/org/semux/config/AbstractConfig.java b/src/main/java/org/semux/config/AbstractConfig.java
index 38b712ed9..d08bf68e3 100644
--- a/src/main/java/org/semux/config/AbstractConfig.java
+++ b/src/main/java/org/semux/config/AbstractConfig.java
@@ -159,11 +159,11 @@ public File getFile() {
 
     @Override
     public Amount getBlockReward(long number) {
-        if (number <= 10_000_000L) {
+        if (number <= 2_000_000L) { // ~2 years
             return SEM.of(3);
-        } else if (number <= 25_000_000L) {
+        } else if (number <= 6_000_000L) { // ~4 years
             return SEM.of(2);
-        } else if (number <= 40_000_000L) {
+        } else if (number <= 14_000_000L) { // ~8 years
             return SEM.of(1);
         } else {
             return ZERO;
diff --git a/src/test/java/org/semux/config/MainnetConfigTest.java b/src/test/java/org/semux/config/MainnetConfigTest.java
index 484d7c7b8..0ef27c9c3 100644
--- a/src/test/java/org/semux/config/MainnetConfigTest.java
+++ b/src/test/java/org/semux/config/MainnetConfigTest.java
@@ -48,11 +48,11 @@ public void testLoad() {
     @Test
     public void testBlockReward() {
         Amount total = LongStream
-                .rangeClosed(1, 100_000_000)
+                .rangeClosed(1, 20_000_000)
                 .mapToObj(config::getBlockReward)
                 .reduce(ZERO, Amount::sum);
 
-        assertEquals(SEM.of(75_000_000), total);
+        assertEquals(SEM.of(22_000_000), total);
     }
 
     @Test