diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 052cddc..511d671 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -14,8 +14,10 @@ jobs:
     strategy:
       matrix:
         ruby:
-          - '3.1.2'
-          - '2.6.0'
+          - '3.1'
+          - '3.3'
+          - '3.4'
+          - '4.0'
 
     steps:
     - uses: actions/checkout@v7
diff --git a/Gemfile b/Gemfile
index bac357f..25fa92e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,5 +4,10 @@ gemspec
 
 gem "debug"
 gem "rake"
-gem "minitest"
+gem "minitest", "< 6"
+gem "parallel", "< 2"
 gem "standard"
+gem "ostruct"
+gem "fiddle"
+gem "racc"
+gem "base64"
diff --git a/Gemfile.lock b/Gemfile.lock
index a0e4dac..43108ee 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,44 +6,65 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    ast (2.4.2)
+    ast (2.4.3)
+    base64 (0.3.0)
     debug (1.6.2)
       irb (>= 1.3.6)
       reline (>= 0.3.1)
+    fiddle (1.1.8)
     io-console (0.5.11)
     irb (1.4.1)
       reline (>= 0.3.0)
-    json (2.6.2)
-    minitest (5.16.3)
-    parallel (1.22.1)
-    parser (3.1.2.1)
+    json (2.21.2)
+    language_server-protocol (3.17.0.6)
+    lint_roller (1.1.0)
+    minitest (5.27.0)
+    ostruct (0.6.3)
+    parallel (1.28.0)
+    parser (3.3.12.0)
       ast (~> 2.4.1)
+      racc
+    prism (1.9.0)
+    racc (1.8.1)
     rainbow (3.1.1)
     rake (13.0.6)
-    regexp_parser (2.5.0)
+    regexp_parser (2.13.0)
     reline (0.3.1)
       io-console (~> 0.5)
-    rexml (3.2.5)
-    rubocop (1.35.1)
+    rubocop (1.88.2)
       json (~> 2.3)
-      parallel (~> 1.10)
-      parser (>= 3.1.2.1)
+      language_server-protocol (~> 3.17.0.2)
+      lint_roller (~> 1.1.0)
+      parallel (>= 1.10)
+      parser (>= 3.3.0.2)
       rainbow (>= 2.2.2, < 4.0)
-      regexp_parser (>= 1.8, < 3.0)
-      rexml (>= 3.2.5, < 4.0)
-      rubocop-ast (>= 1.20.1, < 2.0)
+      regexp_parser (>= 2.9.3, < 3.0)
+      rubocop-ast (>= 1.49.0, < 2.0)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.21.0)
-      parser (>= 3.1.1.0)
-    rubocop-performance (1.14.3)
-      rubocop (>= 1.7.0, < 2.0)
-      rubocop-ast (>= 0.4.0)
-    ruby-progressbar (1.11.0)
-    standard (1.16.1)
-      rubocop (= 1.35.1)
-      rubocop-performance (= 1.14.3)
-    unicode-display_width (2.3.0)
+      unicode-display_width (>= 2.4.0, < 4.0)
+    rubocop-ast (1.50.0)
+      parser (>= 3.3.7.2)
+      prism (~> 1.7)
+    rubocop-performance (1.26.1)
+      lint_roller (~> 1.1)
+      rubocop (>= 1.75.0, < 2.0)
+      rubocop-ast (>= 1.47.1, < 2.0)
+    ruby-progressbar (1.13.0)
+    standard (1.56.0)
+      language_server-protocol (~> 3.17.0.2)
+      lint_roller (~> 1.0)
+      rubocop (~> 1.88.0)
+      standard-custom (~> 1.0.0)
+      standard-performance (~> 1.8)
+    standard-custom (1.0.2)
+      lint_roller (~> 1.0)
+      rubocop (~> 1.50)
+    standard-performance (1.9.0)
+      lint_roller (~> 1.1)
+      rubocop-performance (~> 1.26.0)
+    unicode-display_width (3.3.0)
+      unicode-emoji (~> 4.3)
+    unicode-emoji (4.3.0)
 
 PLATFORMS
   arm64-darwin-21
@@ -51,9 +72,14 @@ PLATFORMS
   x86_64-linux
 
 DEPENDENCIES
+  base64
   debug
-  minitest
+  fiddle
+  minitest (< 6)
+  ostruct
+  parallel (< 2)
   put!
+  racc
   rake
   standard
 
diff --git a/put.gemspec b/put.gemspec
index d585e6d..9ef2c28 100644
--- a/put.gemspec
+++ b/put.gemspec
@@ -9,7 +9,7 @@ Gem::Specification.new do |spec|
   spec.summary = "Put helps you write prioritized, multi-variate sort_by blocks"
   spec.homepage = "https://github.com/testdouble/put"
   spec.license = "MIT"
-  spec.required_ruby_version = ">= 2.6.0"
+  spec.required_ruby_version = ">= 3.1.0"
 
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = spec.homepage