diff --git a/Gemfile.lock b/Gemfile.lock
index 9a3653c..385ad65 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,38 +2,41 @@ PATH
   remote: .
   specs:
     xdr (3.0.3)
-      activemodel (>= 4.2, < 8.0)
-      activesupport (>= 4.2, < 8.0)
+      activemodel (>= 4.2, < 9.0)
+      activesupport (>= 4.2, < 9.0)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    activemodel (7.1.3.2)
-      activesupport (= 7.1.3.2)
-    activesupport (7.1.3.2)
+    activemodel (8.1.3)
+      activesupport (= 8.1.3)
+    activesupport (8.1.3)
       base64
       bigdecimal
-      concurrent-ruby (~> 1.0, >= 1.0.2)
+      concurrent-ruby (~> 1.0, >= 1.3.1)
       connection_pool (>= 2.2.5)
       drb
       i18n (>= 1.6, < 2)
+      json
+      logger (>= 1.4.2)
       minitest (>= 5.1)
-      mutex_m
-      tzinfo (~> 2.0)
+      securerandom (>= 0.3)
+      tzinfo (~> 2.0, >= 2.0.5)
+      uri (>= 0.13.1)
     ast (2.4.2)
     backports (3.24.1)
-    base64 (0.2.0)
-    bigdecimal (3.1.6)
+    base64 (0.3.0)
+    bigdecimal (4.1.1)
     break (0.40.0)
     bundler-audit (0.9.1)
       bundler (>= 1.2.0, < 3)
       thor (~> 1.0)
     coderay (1.1.3)
-    concurrent-ruby (1.2.3)
-    connection_pool (2.4.1)
+    concurrent-ruby (1.3.6)
+    connection_pool (3.0.2)
     diff-lcs (1.5.1)
     docile (1.4.0)
-    drb (2.2.1)
+    drb (2.2.3)
     ffi (1.16.3)
     formatador (1.1.0)
     guard (2.18.1)
@@ -50,7 +53,7 @@ GEM
       guard (~> 2.1)
       guard-compat (~> 1.1)
       rspec (>= 2.99.0, < 4.0)
-    i18n (1.14.1)
+    i18n (1.14.8)
       concurrent-ruby (~> 1.0)
     json (2.7.1)
     language_server-protocol (3.17.0.3)
@@ -58,10 +61,12 @@ GEM
     listen (3.9.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
+    logger (1.7.0)
     lumberjack (1.2.10)
     method_source (1.0.0)
-    minitest (5.22.2)
-    mutex_m (0.2.0)
+    minitest (6.0.3)
+      drb (~> 2.0)
+      prism (~> 1.5)
     nenv (0.3.0)
     notiffany (0.1.3)
       nenv (~> 0.1)
@@ -70,6 +75,7 @@ GEM
     parser (3.3.0.5)
       ast (~> 2.4.1)
       racc
+    prism (1.9.0)
     pry (0.14.2)
       coderay (~> 1.1)
       method_source (~> 1.0)
@@ -117,6 +123,7 @@ GEM
       rubocop (>= 1.48.1, < 2.0)
       rubocop-ast (>= 1.30.0, < 2.0)
     ruby-progressbar (1.13.0)
+    securerandom (0.4.1)
     shellany (0.0.1)
     simplecov (0.22.0)
       docile (~> 1.1)
@@ -141,6 +148,7 @@ GEM
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
     unicode-display_width (2.5.0)
+    uri (1.1.1)
     yard (0.9.36)
     yard-junk (0.0.9)
       backports (>= 3.18)
diff --git a/xdr.gemspec b/xdr.gemspec
index fd76fcf..cd99db1 100644
--- a/xdr.gemspec
+++ b/xdr.gemspec
@@ -25,6 +25,6 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = ">= 2.4.0"
 
-  spec.add_dependency "activesupport", ">= 4.2", "< 8.0"
-  spec.add_dependency "activemodel", ">= 4.2", "< 8.0"
+  spec.add_dependency "activesupport", ">= 4.2", "< 9.0"
+  spec.add_dependency "activemodel", ">= 4.2", "< 9.0"
 end