diff --git a/Gemfile b/Gemfile
index 0b95b32f..f8df4045 100644
--- a/Gemfile
+++ b/Gemfile
@@ -92,7 +92,7 @@ gem 'image_processing', '>= 1.2'
 
 gem 'json-schema', '~> 6.0'
 
-gem 'triangulum', '0.27.1'
+gem 'triangulum', '0.28.0'
 
 gem 'benchmark'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 9c61ae66..0ab0cc4b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -596,7 +596,7 @@ GEM
       logger
     thor (1.5.0)
     timeout (0.6.1)
-    triangulum (0.27.1)
+    triangulum (0.28.0)
       base64 (~> 0.3)
       json (~> 2.19)
       open3 (~> 0.2)
@@ -662,7 +662,7 @@ DEPENDENCIES
   simplecov (~> 0.22.0)
   simplecov-cobertura (~> 3.0)
   test-prof (~> 1.0)
-  triangulum (= 0.27.1)
+  triangulum (= 0.28.0)
   tucana (= 0.0.76)
   tzinfo-data