diff --git a/Gemfile.lock b/Gemfile.lock
index 326ab79636..eb4ac5107b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -473,7 +473,7 @@ GEM
       ast (~> 2.4.1)
       racc
     pdf-core (0.9.0)
-    pdf-reader (2.15.0)
+    pdf-reader (2.15.1)
       Ascii85 (>= 1.0, < 3.0, != 2.0.0)
       afm (>= 0.2.1, < 2)
       hashery (~> 2.0)