diff --git a/Gemfile b/Gemfile
index 3bfcdea9d..b8e9aa209 100644
--- a/Gemfile
+++ b/Gemfile
@@ -29,7 +29,7 @@ gem 'devise-token_authenticatable', '~> 0.3.0'
 
 # Captcha
 
-gem 'simple_captcha2', '0.3.2', :require => 'simple_captcha'
+gem 'simple_captcha2', '0.3.4', :require => 'simple_captcha'
 
 # Background processing
 
diff --git a/Gemfile.lock b/Gemfile.lock
index a7184e019..4a27389fa 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -602,7 +602,7 @@ GEM
       celluloid (>= 0.14.1)
       ice_cube (= 0.11.1)
       sidekiq (>= 3.0.0)
-    simple_captcha2 (0.3.2)
+    simple_captcha2 (0.3.4)
       rails (>= 4.1)
     simple_oauth (0.2.0)
     sinatra (1.4.5)
@@ -776,7 +776,7 @@ DEPENDENCIES
   selenium-webdriver (= 2.45.0)
   sidekiq (= 3.3.2)
   sidetiq (= 0.6.3)
-  simple_captcha2 (= 0.3.2)
+  simple_captcha2 (= 0.3.4)
   sinatra (= 1.4.5)
   sinon-rails (= 1.10.3)
   spring (= 1.3.1)