diff --git a/tool/bundler/test_gems.rb b/tool/bundler/test_gems.rb
index 9126740782..cfddda765c 100644
--- a/tool/bundler/test_gems.rb
+++ b/tool/bundler/test_gems.rb
@@ -5,7 +5,7 @@ source "https://rubygems.org"
 gem "rack", "2.0.8"
 gem "rack-test", "~> 1.1"
 gem "artifice", "~> 0.6.0"
-gem "compact_index", "~> 0.11.0"
+gem "compact_index", "~> 0.12.1"
 gem "sinatra", "~> 2.0"
 gem "rake", "13.0.1"
 gem "builder", "~> 3.2"
diff --git a/tool/bundler/test_gems.rb.lock b/tool/bundler/test_gems.rb.lock
index 67dfac3cef..f6b86cab97 100644
--- a/tool/bundler/test_gems.rb.lock
+++ b/tool/bundler/test_gems.rb.lock
@@ -4,7 +4,7 @@ GEM
     artifice (0.6)
       rack-test
     builder (3.2.4)
-    compact_index (0.11.0)
+    compact_index (0.12.1)
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
     rack (2.0.8)
@@ -29,7 +29,7 @@ PLATFORMS
 DEPENDENCIES
   artifice (~> 0.6.0)
   builder (~> 3.2)
-  compact_index (~> 0.11.0)
+  compact_index (~> 0.12.1)
   rack (= 2.0.8)
   rack-test (~> 1.1)
   rake (= 13.0.1)