diff --git a/Gemfile.lock b/Gemfile.lock
index 7400328f..92363dae 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -17,7 +17,7 @@ GEM
     bibtex-ruby (6.1.0)
       latex-decode (~> 0.0)
       racc (~> 1.7)
-    bigdecimal (3.1.8)
+    bigdecimal (4.1.2)
     citeproc (1.0.10)
       namae (~> 1.0)
     citeproc-ruby (1.1.14)
@@ -38,7 +38,7 @@ GEM
     css_parser (1.17.1)
       addressable
     cssminify2 (2.0.1)
-    csv (3.3.0)
+    csv (3.3.5)
     deep_merge (1.2.2)
     drb (2.2.1)
     em-websocket (0.5.3)
@@ -68,7 +68,7 @@ GEM
       nokogiri (>= 1.4)
     htmlcompressor (0.4.0)
     http_parser.rb (0.8.0)
-    httparty (0.22.0)
+    httparty (0.24.0)
       csv
       mini_mime (>= 1.0.0)
       multi_xml (>= 0.5.2)
@@ -152,8 +152,8 @@ GEM
     mercenary (0.4.0)
     mini_mime (1.1.5)
     minitest (5.22.3)
-    multi_xml (0.7.1)
-      bigdecimal (~> 3.1)
+    multi_xml (0.8.1)
+      bigdecimal (>= 3.1, < 5)
     mutex_m (0.2.0)
     namae (1.2.0)
       racc (~> 1.7)