diff --git a/Gemfile b/Gemfile
index 78c5270a0..eaa326015 100644
--- a/Gemfile
+++ b/Gemfile
@@ -85,7 +85,7 @@ group :test do
   gem "capybara", "~> 3.40.0"
   gem "capybara-webmock", "~> 0.7.0"
   gem "email_spec", "~> 2.2.2"
-  gem "pdf-reader"
+  gem "pdf-reader", "~> 2.12.0"
   gem "rspec-rails", "~> 5.1.2"
   gem "selenium-webdriver", "~> 4.16.0"
   gem "simplecov", "~> 0.22.0", require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index 6d6daf6be..dcc317cbe 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -413,7 +413,7 @@ GEM
     parser (3.3.0.5)
       ast (~> 2.4.1)
       racc
-    pdf-reader (2.11.0)
+    pdf-reader (2.12.0)
       Ascii85 (~> 1.0)
       afm (~> 0.2.1)
       hashery (~> 2.0)
@@ -748,7 +748,7 @@ DEPENDENCIES
   omniauth-rails_csrf_protection (~> 1.0.1)
   omniauth-twitter (~> 1.4.0)
   paranoia (~> 2.6.2)
-  pdf-reader
+  pdf-reader (~> 2.12.0)
   pg (~> 1.4.3)
   pg_search (~> 2.3.6)
   pronto (~> 0.11.1)