diff --git a/tests/io-fixture.hpp b/tests/io-fixture.hpp
index 20d3e5b..80b88a4 100644
--- a/tests/io-fixture.hpp
+++ b/tests/io-fixture.hpp
@@ -1,7 +1,7 @@
 /* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
 /*
- * Copyright (c) 2013-2022  Regents of the University of California
- *                          The University of Memphis
+ * Copyright (c) 2013-2023,  Regents of the University of California,
+ *                           The University of Memphis.
  *
  * This file is part of PSync.
  *
@@ -22,7 +22,7 @@
 
 #include "tests/clock-fixture.hpp"
 
-#include <boost/asio/io_service.hpp>
+#include <boost/asio/io_context.hpp>
 
 namespace psync::tests {
 
@@ -33,17 +33,13 @@
   afterTick() final
   {
     if (m_io.stopped()) {
-#if BOOST_VERSION >= 106600
       m_io.restart();
-#else
-      m_io.reset();
-#endif
     }
     m_io.poll();
   }
 
 protected:
-  boost::asio::io_service m_io;
+  boost::asio::io_context m_io;
 };
 
 } // namespace psync::tests