Upgrade to Ruby 4.0.0 on release day

Just for fun, upgrade to Ruby 4.0.0 [1] on the day of its release.

[1] https://www.ruby-lang.org/en/news/2025/12/25/ruby-4-0-0-released/

Author: brandur

.github/workflows/ci.yaml

@@ -14,7 +14,7 @@ env:
   #
   # If updating this value, you probably also want to add a new version to the
   # spec version matrix below.
-  RUBY_VERSION: "3.4"
+  RUBY_VERSION: "4.0"
 
   # A suitable URL for a test database.
   TEST_DATABASE_NAME: river_test
@@ -134,6 +134,7 @@ jobs:
           - "3.2"
           - "3.3"
           - "3.4"
+          - "4.0"
 
     services:
       postgres:

.tool-versions

@@ -1 +1 @@
-ruby 3.4
+ruby 4.0

Gemfile.lock

@@ -41,6 +41,7 @@ GEM
     docile (1.4.1)
     drb (2.2.3)
     erb (5.1.1)
+    ffi (1.17.2)
     ffi (1.17.2-arm64-darwin)
     ffi (1.17.2-x86_64-linux-gnu)
     fileutils (1.7.3)
@@ -58,12 +59,14 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     logger (1.7.0)
-    minitest (5.26.0)
+    minitest (6.0.0)
+      prism (~> 1.5)
     mutex_m (0.3.0)
     parallel (1.27.0)
     parser (3.3.9.0)
       ast (~> 2.4.1)
       racc
+    pg (1.6.2)
     pg (1.6.2-arm64-darwin)
     pg (1.6.2-x86_64-linux)
     pp (0.6.3)
@@ -159,7 +162,7 @@ GEM
       concurrent-ruby (~> 1.0)
     unicode-display_width (3.2.0)
       unicode-emoji (~> 4.1)
-    unicode-emoji (4.1.0)
+    unicode-emoji (4.2.0)
     uri (1.0.4)
 
 PLATFORMS

driver/riverqueue-activerecord/Gemfile.lock

@@ -56,12 +56,14 @@ GEM
     language_server-protocol (3.17.0.3)
     lint_roller (1.1.0)
     logger (1.6.4)
-    minitest (5.25.4)
+    minitest (6.0.0)
+      prism (~> 1.5)
     parallel (1.26.3)
     parser (3.3.6.0)
       ast (~> 2.4.1)
       racc
     pg (1.5.9)
+    prism (1.7.0)
     psych (5.2.2)
       date
       stringio
@@ -119,7 +121,7 @@ GEM
       concurrent-ruby (~> 1.0)
     unicode-display_width (3.1.2)
       unicode-emoji (~> 4.0, >= 4.0.4)
-    unicode-emoji (4.0.4)
+    unicode-emoji (4.2.0)
     uri (1.0.2)
 
 PLATFORMS

driver/riverqueue-sequel/Gemfile.lock

@@ -72,7 +72,7 @@ GEM
       rubocop-performance (~> 1.23.0)
     unicode-display_width (3.1.2)
       unicode-emoji (~> 4.0, >= 4.0.4)
-    unicode-emoji (4.0.4)
+    unicode-emoji (4.2.0)
 
 PLATFORMS
   arm64-darwin-22