diff --git a/src/main/java/io/github/nstdio/http/ext/spi/CompositeJsonMappingProvider.java b/src/main/java/io/github/nstdio/http/ext/spi/CompositeJsonMappingProvider.java
index deed74a..3f750f0 100644
--- a/src/main/java/io/github/nstdio/http/ext/spi/CompositeJsonMappingProvider.java
+++ b/src/main/java/io/github/nstdio/http/ext/spi/CompositeJsonMappingProvider.java
@@ -29,12 +29,20 @@ static boolean hasAnyImplementation() {
   @Override
   public JsonMapping get() {
     if (isJacksonPresent()) {
-      return new JacksonJsonMapping();
+      return JacksonMappingHolder.INSTANCE;
     }
     if (isGsonPresent()) {
-      return new GsonJsonMapping();
+      return GsonMappingHolder.INSTANCE;
     }
 
     throw new JsonMappingProviderNotFoundException(NO_JSON_MAPPING_FOUND);
   }
+
+  private static class JacksonMappingHolder {
+    private static final JacksonJsonMapping INSTANCE = new JacksonJsonMapping();
+  }
+
+  private static class GsonMappingHolder {
+    private static final GsonJsonMapping INSTANCE = new GsonJsonMapping();
+  }
 }