diff --git a/dev/ci/mac/Gemfile.lock b/dev/ci/mac/Gemfile.lock
index c37fe1f100f62..27b3c6411568d 100644
--- a/dev/ci/mac/Gemfile.lock
+++ b/dev/ci/mac/Gemfile.lock
@@ -72,8 +72,10 @@ GEM
     nap (1.1.0)
     netrc (0.11.0)
     public_suffix (4.0.6)
-    rexml (3.2.5)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     ruby-macho (2.5.1)
+    strscan (3.1.0)
     typhoeus (1.4.0)
       ethon (>= 0.9.0)
     tzinfo (2.0.6)