diff --git a/formulus/Gemfile b/formulus/Gemfile
index 347fef8a4..a063fcd4c 100644
--- a/formulus/Gemfile
+++ b/formulus/Gemfile
@@ -7,7 +7,7 @@ ruby ">= 2.6.10"
 gem 'cocoapods', '>= 1.13', '!= 1.15.0', '!= 1.15.1'
 gem 'activesupport', '>= 6.1.7.5', '!= 7.1.0'
 gem 'xcodeproj', '< 1.26.0'
-gem 'concurrent-ruby', '< 1.3.8'
+gem 'concurrent-ruby', '< 1.3.9'
 
 # Ruby 3.4.0 has removed some libraries from the standard library.
 gem 'bigdecimal'
diff --git a/formulus/Gemfile.lock b/formulus/Gemfile.lock
index 49ebb9d47..013d857f9 100644
--- a/formulus/Gemfile.lock
+++ b/formulus/Gemfile.lock
@@ -62,7 +62,7 @@ GEM
       netrc (~> 0.11)
     cocoapods-try (1.2.0)
     colored2 (3.1.2)
-    concurrent-ruby (1.3.7)
+    concurrent-ruby (1.3.8)
     connection_pool (2.5.5)
     drb (2.2.3)
     escape (0.0.4)
@@ -111,7 +111,7 @@ DEPENDENCIES
   benchmark
   bigdecimal
   cocoapods (>= 1.13, != 1.15.1, != 1.15.0)
-  concurrent-ruby (< 1.3.8)
+  concurrent-ruby (< 1.3.9)
   logger
   mutex_m
   nkf