diff --git a/Gemfile b/Gemfile
index e896045..31b5a88 100644
--- a/Gemfile
+++ b/Gemfile
@@ -37,7 +37,7 @@ group :development do
   gem 'spring-watcher-listen', '~> 2.0', '>= 2.0.1'
 
   # Custom gems:
-  gem 'brakeman', '~> 4.9'
+  gem 'brakeman', '~> 5.1'
   gem 'bundler-audit', '~> 0.7.0'
 end
 
diff --git a/Gemfile.lock b/Gemfile.lock
index bc42ed6..313fad5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -61,7 +61,7 @@ GEM
     bindex (0.8.1)
     bootsnap (1.4.8)
       msgpack (~> 1.0)
-    brakeman (4.9.1)
+    brakeman (5.1.1)
     builder (3.2.4)
     bundler-audit (0.7.0.1)
       bundler (>= 1.2.0, < 3)
@@ -109,7 +109,9 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (1.0.0)
-    mimemagic (0.3.5)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.14.2)
@@ -246,7 +248,7 @@ PLATFORMS
 
 DEPENDENCIES
   bootsnap (~> 1.4)
-  brakeman (~> 4.9)
+  brakeman (~> 5.1)
   bundler-audit (~> 0.7.0)
   byebug (~> 11.1)
   capybara (~> 3.33)