diff --git a/Gemfile.lock b/Gemfile.lock
index ef5d88d..7e36a3e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,21 +1,23 @@
 GEM
   remote: https://www.rubygems.org/
   specs:
-    activesupport (4.1.6)
-      i18n (~> 0.6, >= 0.6.9)
-      json (~> 1.7, >= 1.7.7)
+    activesupport (6.0.0)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
       minitest (~> 5.1)
-      thread_safe (~> 0.1)
       tzinfo (~> 1.1)
+      zeitwerk (~> 2.1, >= 2.1.8)
     awesome_print (1.2.0)
     clbustos-rtf (0.4.2)
+    concurrent-ruby (1.1.5)
     dirty-memoize (0.0.4)
     distribution (0.7.1)
     extendmatrix (0.3.1)
     hoe (3.13.0)
       rake (>= 0.8, < 11.0)
-    i18n (0.6.11)
-    json (1.8.1)
+    i18n (1.7.0)
+      concurrent-ruby (~> 1.0)
+    json (1.8.6)
     metaclass (0.0.4)
     minimization (0.2.1)
       rb-gsl (~> 1.2)
@@ -55,9 +57,10 @@ GEM
     spreadsheet (1.0.0)
       ruby-ole (>= 1.0)
     text-table (1.2.3)
-    thread_safe (0.3.4)
-    tzinfo (1.2.2)
+    thread_safe (0.3.6)
+    tzinfo (1.2.5)
       thread_safe (~> 0.1)
+    zeitwerk (2.2.0)
 
 PLATFORMS
   ruby