diff --git a/Gemfile.lock b/Gemfile.lock
index dfb6c94c448eff5f57bce5a0078bbc9cfa7fe681..97e4f155c9520e59f9f5432e03c55885464e5766 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,7 @@ GEM
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
     addressable (2.4.0)
-    bibtex-ruby (4.4.0)
+    bibtex-ruby (4.4.2)
       latex-decode (~> 0.0)
     citeproc (1.0.3)
       namae (~> 0.8)