diff --git a/Gemfile b/Gemfile
index 0e2b1603..3bdcc668 100644
--- a/Gemfile
+++ b/Gemfile
@@ -19,7 +19,7 @@ group :development, :test do
   gem "factory_bot"
   gem "govuk_schemas"
   gem "govuk_test"
-  gem "openapi3_parser", "~> 0.9.0" # This should be the same version as used in the tech-docs-gem
+  gem "openapi3_parser", "~> 0.10.0"
   gem "pact"
   gem "pry-byebug"
   gem "rspec-rails"
diff --git a/Gemfile.lock b/Gemfile.lock
index a8747385..dc613346 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -102,7 +102,11 @@ GEM
       rspec (>= 2.14, < 4)
     climate_control (1.2.0)
     coderay (1.1.3)
-    commonmarker (0.23.11)
+    commonmarker (2.0.2.1)
+      rb_sys (~> 0.9)
+    commonmarker (2.0.2.1-aarch64-linux)
+    commonmarker (2.0.2.1-arm64-darwin)
+    commonmarker (2.0.2.1-x86_64-linux)
     concurrent-ruby (1.3.4)
     connection_pool (2.4.1)
     crack (1.0.0)
@@ -274,8 +278,8 @@ GEM
     omniauth-oauth2 (1.8.0)
       oauth2 (>= 1.4, < 3)
       omniauth (~> 2.0)
-    openapi3_parser (0.9.2)
-      commonmarker (~> 0.17)
+    openapi3_parser (0.10.0)
+      commonmarker (>= 1.0)
     opentelemetry-api (1.4.0)
     opentelemetry-common (0.21.0)
       opentelemetry-api (~> 1.0)
@@ -573,6 +577,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
+    rb_sys (0.9.106)
     rdoc (6.10.0)
       psych (>= 4.0.0)
     regexp_parser (2.10.0)
@@ -713,7 +718,7 @@ DEPENDENCIES
   govuk_schemas
   govuk_test
   listen
-  openapi3_parser (~> 0.9.0)
+  openapi3_parser (~> 0.10.0)
   pact
   pg
   plek