diff --git a/Gemfile b/Gemfile
index 74f0164..c5fcca0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,7 +10,7 @@ gem "json"
 gem "watchr"
 gem "uglifier"
 gem "sqlite3"
-gem "bibtex-ruby","<3.0"  # >=3.0 breaks on Ruby 1.8
+gem "bibtex-ruby","<6.0" # >=3.0 breaks on Ruby 1.8
 gem "citeproc-ruby","<1.0"  # >=1.0 breaks on Ruby <1.9.3
 
 gem "dm-core",">=1.0"
diff --git a/Gemfile.lock b/Gemfile.lock
index 868a825..eb42290 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,9 +3,8 @@ GEM
   specs:
     addressable (2.7.0)
       public_suffix (>= 2.0.2, < 5.0)
-    bibtex-ruby (2.3.4)
-      latex-decode (>= 0.0.6)
-      multi_json (~> 1.3)
+    bibtex-ruby (5.1.0)
+      latex-decode (~> 0.0)
     citeproc-ruby (0.0.6)
       logging (~> 1.5)
       nokogiri (~> 1.5)
@@ -88,7 +87,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  bibtex-ruby (< 3.0)
+  bibtex-ruby (< 6.0)
   citeproc-ruby (< 1.0)
   dm-aggregates
   dm-core (>= 1.0)