diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9b0473130..daeb88792 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -45,6 +45,9 @@ jobs:
              RAILS_VERSION: 'main'
 
          # Rails 8.0 builds >= 3.2
+         - ruby: 3.4.0-rc1
+           env:
+             RAILS_VERSION: '~> 8.0.0'
          - ruby: 3.3
            env:
              RAILS_VERSION: '~> 8.0.0'
diff --git a/spec/rspec/rails/matchers/action_cable/have_broadcasted_to_spec.rb b/spec/rspec/rails/matchers/action_cable/have_broadcasted_to_spec.rb
index 67d4a51c7..b6d4d913f 100644
--- a/spec/rspec/rails/matchers/action_cable/have_broadcasted_to_spec.rb
+++ b/spec/rspec/rails/matchers/action_cable/have_broadcasted_to_spec.rb
@@ -253,7 +253,7 @@ def broadcast(stream, msg)
           .from_channel(channel)
           .with(a_hash_including(a: :b))
           .description
-      ).to eq("have broadcasted exactly 1 messages to my_stream with a hash including {:a => :b}")
+      ).to eq("have broadcasted exactly 1 messages to my_stream with a hash including #{{:a => :b}}")
     end
   end
 end
diff --git a/spec/rspec/rails/matchers/be_a_new_spec.rb b/spec/rspec/rails/matchers/be_a_new_spec.rb
index 76906a56f..e9b27f4f6 100644
--- a/spec/rspec/rails/matchers/be_a_new_spec.rb
+++ b/spec/rspec/rails/matchers/be_a_new_spec.rb
@@ -74,7 +74,13 @@ def new_record?; true; end
             expect {
               expect(record).to be_a_new(record.class).with(
                 foo: a_string_matching("bar"))
-            }.to raise_error("attribute {\"foo\"=>(a string matching \"bar\")} was not set on #{record.inspect}")
+            }.to raise_error { |e|
+              if RUBY_VERSION >= '3.4'
+                "attribute {\"foo\" => (a string matching \"bar\")} was not set on #{record.inspect}"
+              else
+                "attribute {\"foo\"=>(a string matching \"bar\")} was not set on #{record.inspect}"
+              end
+            }
           end
 
           context "matcher is wrong type" do
@@ -106,7 +112,13 @@ def new_record?; true; end
                   foo: a_string_matching("foo"),
                   bar: a_string_matching("barn")
                 )
-              }.to raise_error("attribute {\"bar\"=>(a string matching \"barn\")} was not set on #{record.inspect}")
+              }.to raise_error { |e|
+                if RUBY_VERSION >= '3.4'
+                  "attribute {\"bar\" => (a string matching \"barn\")} was not set on #{record.inspect}"
+                else
+                  "attribute {\"bar\"=>(a string matching \"barn\")} was not set on #{record.inspect}"
+                end
+              }
             end
           end
         end
@@ -118,8 +130,13 @@ def new_record?; true; end
             expect(record).to be_a_new(record.class).with(zoo: 'zoo', car: 'car')
           }.to raise_error { |e|
             expect(e.message).to match(/attributes \{.*\} were not set on #{Regexp.escape record.inspect}/)
-            expect(e.message).to match(/"zoo"=>"zoo"/)
-            expect(e.message).to match(/"car"=>"car"/)
+            if RUBY_VERSION >= '3.4'
+              expect(e.message).to match(/"zoo" => "zoo"/)
+              expect(e.message).to match(/"car" => "car"/)
+            else
+              expect(e.message).to match(/"zoo"=>"zoo"/)
+              expect(e.message).to match(/"car"=>"car"/)
+            end
           }
         end
       end
@@ -129,7 +146,7 @@ def new_record?; true; end
           expect {
             expect(record).to be_a_new(record.class).with(foo: 'bar')
           }.to raise_error(
-            %(attribute {"foo"=>"bar"} was not set on #{record.inspect})
+            %(attribute #{{"foo"=>"bar"}} was not set on #{record.inspect})
           )
         end
       end
@@ -166,8 +183,13 @@ def new_record?; false; end
             expect(record).to be_a_new(String).with(zoo: 'zoo', car: 'car')
           }.to raise_error { |e|
             expect(e.message).to match(/expected #{Regexp.escape record.inspect} to be a new String and attributes \{.*\} were not set on #{Regexp.escape record.inspect}/)
-            expect(e.message).to match(/"zoo"=>"zoo"/)
-            expect(e.message).to match(/"car"=>"car"/)
+            if RUBY_VERSION >= '3.4'
+              expect(e.message).to match(/"zoo" => "zoo"/)
+              expect(e.message).to match(/"car" => "car"/)
+            else
+              expect(e.message).to match(/"zoo"=>"zoo"/)
+              expect(e.message).to match(/"car"=>"car"/)
+            end
           }
         end
       end
@@ -178,7 +200,7 @@ def new_record?; false; end
             expect(record).to be_a_new(String).with(foo: 'bar')
           }.to raise_error(
             "expected #{record.inspect} to be a new String and " +
-            %(attribute {"foo"=>"bar"} was not set on #{record.inspect})
+            %(attribute #{{"foo"=>"bar"}} was not set on #{record.inspect})
           )
         end
       end
diff --git a/spec/rspec/rails/matchers/be_routable_spec.rb b/spec/rspec/rails/matchers/be_routable_spec.rb
index c3a6a1b15..362c39699 100644
--- a/spec/rspec/rails/matchers/be_routable_spec.rb
+++ b/spec/rspec/rails/matchers/be_routable_spec.rb
@@ -20,7 +20,7 @@
       allow(routes).to receive(:recognize_path) { raise ActionController::RoutingError, 'ignore' }
       expect do
         expect({ get: "/a/path" }).to be_routable
-      end.to raise_error(/expected \{:get=>"\/a\/path"\} to be routable/)
+      end.to raise_error(/expected #{{:get=>"\/a\/path"}} to be routable/)
     end
   end
 
@@ -37,7 +37,7 @@
       allow(routes).to receive(:recognize_path) { { controller: "foo" } }
       expect do
         expect({ get: "/a/path" }).not_to be_routable
-      end.to raise_error(/expected \{:get=>"\/a\/path"\} not to be routable, but it routes to \{:controller=>"foo"\}/)
+      end.to raise_error(/expected #{{:get=>"\/a\/path"}} not to be routable, but it routes to #{{:controller=>"foo"}}/)
     end
   end
 end
diff --git a/spec/rspec/rails/matchers/route_to_spec.rb b/spec/rspec/rails/matchers/route_to_spec.rb
index ae49791f8..d432a9f64 100644
--- a/spec/rspec/rails/matchers/route_to_spec.rb
+++ b/spec/rspec/rails/matchers/route_to_spec.rb
@@ -9,7 +9,7 @@ def assert_recognizes(*)
   it "provides a description" do
     matcher = route_to("these" => "options")
     matcher.matches?(get: "path")
-    expect(matcher.description).to eq("route {:get=>\"path\"} to {\"these\"=>\"options\"}")
+    expect(matcher.description).to eq("route #{{:get=>"path"}} to #{{"these"=>"options"}}")
   end
 
   it "delegates to assert_recognizes" do
@@ -109,7 +109,7 @@ def assert_recognizes(*)
       it "fails with custom message" do
         expect {
           expect({ get: "path" }).not_to route_to("these" => "options")
-        }.to raise_error(/expected \{:get=>"path"\} not to route to \{"these"=>"options"\}/)
+        }.to raise_error(/expected #{{:get=>"path"}} not to route to #{{"these"=>"options"}}/)
       end
     end