diff --git a/Gemfile.lock b/Gemfile.lock
index 8a634e6..dd01dee 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,14 +7,16 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.8.5)
-      public_suffix (>= 2.0.2, < 6.0)
+    addressable (2.8.9)
+      public_suffix (>= 2.0.2, < 8.0)
     akami (1.3.1)
       gyoku (>= 0.4.0)
       nokogiri
     ast (2.4.2)
+    bigdecimal (4.0.1)
     builder (3.2.4)
-    crack (0.4.5)
+    crack (1.0.1)
+      bigdecimal
       rexml
     date (3.3.3)
     defra_ruby_style (0.4.0)
@@ -27,7 +29,7 @@ GEM
     gyoku (1.4.0)
       builder (>= 2.1.2)
       rexml (~> 3.0)
-    hashdiff (1.0.1)
+    hashdiff (1.2.1)
     httpi (3.0.1)
       rack
     json (2.6.3)
@@ -56,13 +58,13 @@ GEM
     parser (3.2.2.4)
       ast (~> 2.4.1)
       racc
-    public_suffix (5.0.3)
+    public_suffix (7.0.5)
     racc (1.7.2)
     rack (3.0.8)
     rainbow (3.1.1)
     rake (13.1.0)
     regexp_parser (2.8.2)
-    rexml (3.2.6)
+    rexml (3.4.4)
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
       rspec-expectations (~> 3.12.0)
@@ -121,7 +123,7 @@ GEM
       addressable
       httpi (~> 3.0)
       nokogiri (>= 1.4.2)
-    webmock (3.19.1)
+    webmock (3.26.2)
       addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)