diff --git a/Gemfile.lock b/Gemfile.lock
index 4b4c0b6..30f5e14 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -25,7 +25,6 @@ GEM
       rexml
     csv (3.3.5)
     diff-lcs (1.6.2)
-    docile (1.4.1)
     ffi (1.17.2)
     get_process_mem (1.0.0)
       bigdecimal (>= 2.0)
@@ -99,12 +98,7 @@ GEM
       prism (~> 1.7)
     ruby-progressbar (1.13.0)
     ruby2_keywords (0.0.5)
-    simplecov (0.22.0)
-      docile (~> 1.1)
-      simplecov-html (~> 0.11)
-      simplecov_json_formatter (~> 0.1)
-    simplecov-html (0.13.2)
-    simplecov_json_formatter (0.1.4)
+    simplecov (1.0.0)
     sinatra (4.2.1)
       logger (>= 1.6.0)
       mustermann (~> 3.0)
@@ -146,7 +140,7 @@ DEPENDENCIES
   rake (~> 13.0)
   rspec (~> 3.0)
   rubocop (~> 1.88.0)
-  simplecov (~> 0.17)
+  simplecov (~> 1.0)
   sinatra (~> 4.0)
   sinatra-contrib (~> 4.0)
   stream_lines!
diff --git a/stream_lines.gemspec b/stream_lines.gemspec
index 3d44b50..7273a59 100644
--- a/stream_lines.gemspec
+++ b/stream_lines.gemspec
@@ -40,7 +40,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rake', '~> 13.0'
   spec.add_development_dependency 'rspec', '~> 3.0'
   spec.add_development_dependency 'rubocop', '~> 1.88.0'
-  spec.add_development_dependency 'simplecov', '~> 0.17'
+  spec.add_development_dependency 'simplecov', '~> 1.0'
   spec.add_development_dependency 'sinatra', '~> 4.0'
   spec.add_development_dependency 'sinatra-contrib', '~> 4.0'
   spec.add_development_dependency 'webrick', '~> 1.7'