diff --git a/gnu/packages/ruby.scm b/gnu/packages/ruby.scm
index fb07e5f820..ab56e944b4 100644
--- a/gnu/packages/ruby.scm
+++ b/gnu/packages/ruby.scm
@@ -11079,13 +11079,13 @@ (define-public ruby-safe-yaml
 (define-public ruby-mercenary
   (package
     (name "ruby-mercenary")
-    (version "0.3.6")
+    (version "0.4.0")
     (source (origin
               (method url-fetch)
               (uri (rubygems-uri "mercenary" version))
               (sha256
                (base32
-                "10la0xw82dh5mqab8bl0dk21zld63cqxb1g16fk8cb39ylc4n21a"))))
+                "0f2i827w4lmsizrxixsrv2ssa3gk1b7lmqh8brk8ijmdb551wnmj"))))
     (build-system ruby-build-system)
     (arguments `(#:test-target "spec"))
     (native-inputs