diff --git a/Project.toml b/Project.toml
index 320456a..89c3895 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,9 +1,11 @@
 name = "FewBodyDB"
 uuid = "db38d531-b084-4210-bfec-cee5c3c1a709"
-version = "0.0.3"
+version = "0.0.4"
 authors = ["Shuhei Ohno", "Martin Mikkelsen"]
 
 [deps]
+OrderedCollections = "bac558e1-5e72-5ebc-8fee-abe8a469f55d"
 
 [compat]
+OrderedCollections = "1.8.1"
 julia = "1.11"
diff --git a/src/FewBodyDB.jl b/src/FewBodyDB.jl
index 3e014cc..45793ca 100644
--- a/src/FewBodyDB.jl
+++ b/src/FewBodyDB.jl
@@ -1,11 +1,12 @@
 module FewBodyDB
 
 # import / export
+import OrderedCollections: OrderedDict
 export @get, @bib
 
 # set dictionary
-REFS = Dict{String, String}()
-DATA = Dict{String, String}()
+REFS = OrderedDict{String, String}()
+DATA = OrderedDict{String, String}()
 
 # put new data (for development use only)
 macro put(expr)