grntest.gemspec in grntest-1.7.6 vs grntest.gemspec in grntest-1.7.7

@@ -47,10 +47,10 @@
   spec.add_runtime_dependency("groonga-command", ">= 1.4.7")
   spec.add_runtime_dependency("groonga-command-parser")
   spec.add_runtime_dependency("groonga-log")
   spec.add_runtime_dependency("groonga-query-log", ">= 1.4.1")
   spec.add_runtime_dependency("groonga-synonym")
-  spec.add_runtime_dependency("json")
+  spec.add_runtime_dependency("json", ">= 2.8.1")
   spec.add_runtime_dependency("msgpack")
   spec.add_runtime_dependency("rexml")
 
   spec.add_development_dependency("bundler")
   spec.add_development_dependency("kramdown")