diff --git a/Gemfile.lock b/Gemfile.lock
index fe02cf70..74e0b201 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -395,7 +395,7 @@ GEM
     pdf-core (0.10.0)
     pdf-inspector (1.3.0)
       pdf-reader (>= 1.0, < 3.0.a)
-    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)