diff --git a/ethereum/config.py b/ethereum/config.py
index 7e0967ee2..fbc20d4af 100644
--- a/ethereum/config.py
+++ b/ethereum/config.py
@@ -65,7 +65,8 @@
     DAO_WITHDRAWER=utils.normalize_address('0xbf4ed7b27f1d666546e30d74d50d173d20bca754'),
     # Anti-DoS fork
     ANTI_DOS_FORK_BLKNUM=2457000,
-    CLEARING_FORK_BLKNUM=2 ** 98,
+    # "spurious dragon" fork
+    SPURIOUS_DRAGON_FORK_BLKNUM=3500000,
 )
 assert default_config['NEPHEW_REWARD'] == \
     default_config['BLOCK_REWARD'] // 32
diff --git a/fixtures b/fixtures
index 862b4e3d4..10ee17035 160000
--- a/fixtures
+++ b/fixtures
@@ -1 +1 @@
-Subproject commit 862b4e3d4a9a7141af1b4aaf7dfe228a6a294614
+Subproject commit 10ee170351fbacd448de7e2e458ab968d35b1d27