diff --git a/shard.yml b/shard.yml
index c9a66dc..2a38cff 100644
--- a/shard.yml
+++ b/shard.yml
@@ -1,7 +1,11 @@
 name: sqlite3
 version: 0.1.0
 
+dependencies:
+  db:
+    github: bcardiff/crystal-db
+    branch: feature/5-type-extensibility
+
 authors:
   - Ary Borenszweig <aborenszweig@manas.com.ar>
   - Brian J. Cardiff <bcardiff@manas.com.ar>
-
diff --git a/src/sqlite3/statement.cr b/src/sqlite3/statement.cr
index d0cde14..ccd726a 100644
--- a/src/sqlite3/statement.cr
+++ b/src/sqlite3/statement.cr
@@ -4,7 +4,7 @@ class SQLite3::Statement < DB::Statement
     check LibSQLite3.prepare_v2(@connection, sql, sql.bytesize + 1, out @stmt, nil)
   end
 
-  protected def perform_query(args : Slice(DB::Any))
+  protected def perform_query(args : Enumerable) : DB::ResultSet
     LibSQLite3.reset(self)
     args.each_with_index(1) do |arg, index|
       bind_arg(index, arg)
@@ -12,7 +12,7 @@ class SQLite3::Statement < DB::Statement
     ResultSet.new(self)
   end
 
-  protected def perform_exec(args : Slice(DB::Any))
+  protected def perform_exec(args : Enumerable) : DB::ExecResult
     rs = perform_query(args)
     rs.move_next
     rs.close