diff --git a/server/conf/evolutions/default/7.sql b/server/conf/evolutions/default/7.sql
new file mode 100644
index 0000000..4d998da
--- /dev/null
+++ b/server/conf/evolutions/default/7.sql
@@ -0,0 +1,10 @@
+
+# --- !Ups
+
+ALTER TABLE blocks
+ALTER COLUMN nonce TYPE BIGINT;
+
+# --- !Downs
+
+ALTER TABLE blocks
+ALTER COLUMN nonce TYPE INT;