diff --git a/util/read.cpp b/util/read.cpp
index 897ab57..b4f355c 100644
--- a/util/read.cpp
+++ b/util/read.cpp
@@ -8,8 +8,8 @@
 
 class NullEventHandler : public YAML::EventHandler {
  public:
-  typedef YAML::Mark Mark;
-  typedef YAML::anchor_t anchor_t;
+  using Mark = YAML::Mark;
+  using anchor_t = YAML::anchor_t;
 
   NullEventHandler() = default;
 
diff --git a/util/sandbox.cpp b/util/sandbox.cpp
index ec4a66f..f21490e 100644
--- a/util/sandbox.cpp
+++ b/util/sandbox.cpp
@@ -6,8 +6,8 @@
 
 class NullEventHandler : public YAML::EventHandler {
  public:
-  typedef YAML::Mark Mark;
-  typedef YAML::anchor_t anchor_t;
+  using Mark = YAML::Mark;
+  using anchor_t = YAML::anchor_t;
 
   NullEventHandler() = default;