diff --git a/Gemfile.lock b/Gemfile.lock
index a3a1d58f..bd6bade1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -153,7 +153,7 @@ GEM
     padrino-support (0.15.3)
     parallel (1.24.0)
     parslet (2.0.0)
-    pdf-reader (2.11.0)
+    pdf-reader (2.12.0)
       Ascii85 (~> 1.0)
       afm (~> 0.2.1)
       hashery (~> 2.0)