diff --git a/CHANGELOG.md b/CHANGELOG.md
index 927fbf2f90d..f5a7056e7d9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@
 
 ### Additions and Improvements
 - Add error messages on authentication failures with username and password [#6212](https://github.com/hyperledger/besu/pull/6212)
+- Set Ethereum Classic mainnet activation block for Spiral network upgrade [#6267](https://github.com/hyperledger/besu/pull/6267)
 
 ### Bug fixes
 
diff --git a/besu/src/test/java/org/hyperledger/besu/ForkIdsNetworkConfigTest.java b/besu/src/test/java/org/hyperledger/besu/ForkIdsNetworkConfigTest.java
index 5bc1c30bd61..7a83cd87515 100644
--- a/besu/src/test/java/org/hyperledger/besu/ForkIdsNetworkConfigTest.java
+++ b/besu/src/test/java/org/hyperledger/besu/ForkIdsNetworkConfigTest.java
@@ -147,8 +147,9 @@ public static Collection<Object[]> parameters() {
                 new ForkId(Bytes.ofUnsignedInt(0x9007bfccL), 11700000L),
                 new ForkId(Bytes.ofUnsignedInt(0xdb63a1caL), 13189133),
                 new ForkId(Bytes.ofUnsignedInt(0x0f6bf187L), 14525000L),
-                new ForkId(Bytes.ofUnsignedInt(0x7fd1bb25L), 0L),
-                new ForkId(Bytes.ofUnsignedInt(0x7fd1bb25L), 0L))
+                new ForkId(Bytes.ofUnsignedInt(0x7fd1bb25L), 19250000L),
+                new ForkId(Bytes.ofUnsignedInt(0xbe46d57cL), 0L),
+                new ForkId(Bytes.ofUnsignedInt(0xbe46d57cL), 0L))
           });
     }
 
diff --git a/config/src/main/resources/classic.json b/config/src/main/resources/classic.json
index 6b08923b51c..ea7c49e1fa3 100644
--- a/config/src/main/resources/classic.json
+++ b/config/src/main/resources/classic.json
@@ -13,6 +13,7 @@
     "thanosBlock": 11700000,
     "magnetoBlock": 13189133,
     "mystiqueBlock": 14525000,
+    "spiralBlock": 19250000,
     "ethash": {
 
     },