diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index b35c130..6a68bab 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -13,10 +13,9 @@ jobs:
     strategy:
       matrix:
         ruby-version:
+          - '3.4'
           - '3.3'
           - '3.2'
-          - '3.1'
-          - '3.0'
 
     steps:
       - uses: actions/checkout@v4
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1242fc3..f34c8d5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 4.3.1
+
+* Bump rack dependency
+* Bump oj dependency
+
 ## 4.3.0
 
 * Add support for disabling retries on timeout for `GET` and `HEAD` requests
diff --git a/Gemfile.lock b/Gemfile.lock
index 584aa9b..102b84f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,39 +1,43 @@
 PATH
   remote: .
   specs:
-    grac (4.3.0)
-      oj (~> 3.13.23)
+    grac (4.3.1)
+      oj (~> 3.16)
       typhoeus (~> 1)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    benchmark-ips (2.10.0)
-    builder (3.2.3)
-    diff-lcs (1.5.0)
-    ethon (0.16.0)
+    benchmark-ips (2.14.0)
+    bigdecimal (3.2.3)
+    builder (3.3.0)
+    diff-lcs (1.6.2)
+    ethon (0.15.0)
       ffi (>= 1.15.0)
-    ffi (1.15.5)
-    oj (3.13.23)
-    rack (3.1.16)
-    rack-test (2.1.0)
+    ffi (1.17.2)
+    oj (3.16.11)
+      bigdecimal (>= 3.0)
+      ostruct (>= 0.2)
+    ostruct (0.6.3)
+    rack (3.2.1)
+    rack-test (2.2.0)
       rack (>= 1.3)
-    rake (13.0.1)
-    rspec (3.12.0)
-      rspec-core (~> 3.12.0)
-      rspec-expectations (~> 3.12.0)
-      rspec-mocks (~> 3.12.0)
-    rspec-core (3.12.0)
-      rspec-support (~> 3.12.0)
-    rspec-expectations (3.12.0)
+    rake (13.3.0)
+    rspec (3.13.1)
+      rspec-core (~> 3.13.0)
+      rspec-expectations (~> 3.13.0)
+      rspec-mocks (~> 3.13.0)
+    rspec-core (3.13.5)
+      rspec-support (~> 3.13.0)
+    rspec-expectations (3.13.5)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.12.0)
-    rspec-mocks (3.12.0)
+      rspec-support (~> 3.13.0)
+    rspec-mocks (3.13.5)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.12.0)
-    rspec-support (3.12.0)
-    typhoeus (1.4.0)
-      ethon (>= 0.9.0)
+      rspec-support (~> 3.13.0)
+    rspec-support (3.13.6)
+    typhoeus (1.5.0)
+      ethon (>= 0.9.0, < 0.16.0)
 
 PLATFORMS
   ruby
diff --git a/grac.gemspec b/grac.gemspec
index 09db18d..76e2c46 100644
--- a/grac.gemspec
+++ b/grac.gemspec
@@ -26,6 +26,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rack',          '~> 3.1'
   spec.add_development_dependency 'rack-test',     '~> 2.1'
 
-  spec.add_runtime_dependency 'oj',                '~> 3.13.23'
+  spec.add_runtime_dependency 'oj',                '~> 3.16'
   spec.add_runtime_dependency 'typhoeus',          '~> 1'
 end
diff --git a/lib/grac/version.rb b/lib/grac/version.rb
index 51107a9..b923028 100644
--- a/lib/grac/version.rb
+++ b/lib/grac/version.rb
@@ -1,3 +1,3 @@
 module Grac
-  VERSION = "4.3.0"
+  VERSION = "4.3.1"
 end
diff --git a/spec/lib/grac/client_spec.rb b/spec/lib/grac/client_spec.rb
index 29c4b9d..eccb08a 100644
--- a/spec/lib/grac/client_spec.rb
+++ b/spec/lib/grac/client_spec.rb
@@ -538,7 +538,7 @@ def check_options(client, field, value)
             grac.send(:check_response, method, grac_response)
           }.to raise_exception(
             Grac::Exception::BadRequest,
-            "GET '#{grac.uri}' failed with content: {\"value\"=>\"success\"}"
+            /GET '#{grac.uri}' failed with content: {"value"\s?\=\>\s?"success"}/
           )
         end
       end
@@ -566,7 +566,7 @@ def check_options(client, field, value)
           grac.send(:check_response, method, grac_response)
         }.to raise_exception(
           Grac::Exception::Forbidden,
-          "GET '#{grac.uri}' failed with content: {\"value\"=>\"success\"}"
+          /GET '#{grac.uri}' failed with content: {"value"\s?\=\>\s?"success"}/
         )
       end
     end
@@ -579,7 +579,7 @@ def check_options(client, field, value)
           grac.send(:check_response, method, grac_response)
         }.to raise_exception(
           Grac::Exception::NotFound,
-          "GET '#{grac.uri}' failed with content: {\"value\"=>\"success\"}"
+          /GET '#{grac.uri}' failed with content: {"value"\s?\=\>\s?"success"}/
         )
       end
     end
@@ -592,7 +592,7 @@ def check_options(client, field, value)
           grac.send(:check_response, method, grac_response)
         }.to raise_exception(
           Grac::Exception::Conflict,
-          "GET '#{grac.uri}' failed with content: {\"value\"=>\"success\"}"
+          /GET '#{grac.uri}' failed with content: {"value"\s?\=\>\s?"success"}/
         )
       end
     end
@@ -605,7 +605,7 @@ def check_options(client, field, value)
           grac.send(:check_response, method, grac_response)
         }.to raise_exception(
           Grac::Exception::ServiceError,
-          "GET '#{grac.uri}' failed with content: {\"value\"=>\"success\"}"
+          /GET '#{grac.uri}' failed with content: {"value"\s?\=\>\s?"success"}/
         )
       end
     end