diff --git a/Gemfile b/Gemfile
index c14284722..8eb586aa8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 gem 'rails', '~> 7.0'
 
 # DLSS/domain-specific dependencies
-gem 'cocina-models', '~> 0.90.0'
+gem 'cocina-models', '~> 0.91.0'
 gem 'datacite', '~> 0.3.0'
 gem 'dor-workflow-client', '~> 5.0'
 gem 'druid-tools', '~> 2.2'
diff --git a/Gemfile.lock b/Gemfile.lock
index cef849805..1665b32cf 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -104,7 +104,7 @@ GEM
       capistrano-bundler (>= 1.1, < 3)
     capistrano-shared_configs (0.2.2)
     chronic (0.10.2)
-    cocina-models (0.90.0)
+    cocina-models (0.91.0)
       activesupport
       deprecation
       dry-struct (~> 1.0)
@@ -114,15 +114,15 @@ GEM
       jsonpath
       nokogiri
       openapi3_parser
-      openapi_parser (>= 0.11.1, < 1.0)
+      openapi_parser (~> 1.0)
       rss
       super_diff
       thor
       zeitwerk (~> 2.1)
     coderay (1.1.3)
-    committee (4.99.1)
+    committee (5.0.0)
       json_schema (~> 0.14, >= 0.14.3)
-      openapi_parser (>= 0.11.1, < 1.0)
+      openapi_parser (~> 1.0)
       rack (>= 1.5)
     commonmarker (0.23.10)
     concurrent-ruby (1.2.2)
@@ -312,7 +312,7 @@ GEM
     okcomputer (1.18.4)
     openapi3_parser (0.9.2)
       commonmarker (~> 0.17)
-    openapi_parser (0.15.0)
+    openapi_parser (1.0.0)
     optimist (3.1.0)
     parallel (1.23.0)
     parser (3.2.2.3)
@@ -526,7 +526,7 @@ DEPENDENCIES
   capistrano-passenger
   capistrano-rails
   capistrano-shared_configs
-  cocina-models (~> 0.90.0)
+  cocina-models (~> 0.91.0)
   committee
   config
   datacite (~> 0.3.0)
diff --git a/spec/requests/create_object_spec.rb b/spec/requests/create_object_spec.rb
index 2aebdb1cc..dde101dd6 100644
--- a/spec/requests/create_object_spec.rb
+++ b/spec/requests/create_object_spec.rb
@@ -679,7 +679,7 @@
                                 view: 'stanford',
                                 download: 'none',
                                 controlledDigitalLending: false,
-                                embargo: { view: 'world', download: 'world', releaseDate: '2020-02-29' }
+                                embargo: { view: 'world', download: 'world', releaseDate: '2020-02-29T07:00:00.000+00:00' }
                               })
     end
     let(:data) do
@@ -688,7 +688,7 @@
           "cocinaVersion":"#{Cocina::Models::VERSION}",
           "type":"#{Cocina::Models::ObjectType.book}",
           "label":"This is my label","version":1,"access":{"view":"stanford","download":"none","controlledDigitalLending":false,
-          "embargo":{"view":"world","download":"world","releaseDate":"2020-02-29"}},
+          "embargo":{"view":"world","download":"world","releaseDate":"2020-02-29T07:00:00.000+00:00"}},
           "administrative":{"releaseTags":[],"hasAdminPolicy":"#{admin_policy_id}"},
           "description":{"title":[{"value":"This is my title"}]},
           "identification":{"sourceId":"googlebooks:999999"},
diff --git a/spec/requests/start_accession_spec.rb b/spec/requests/start_accession_spec.rb
index 1f07af500..de85bf739 100644
--- a/spec/requests/start_accession_spec.rb
+++ b/spec/requests/start_accession_spec.rb
@@ -40,8 +40,7 @@
     end
 
     it 'does not open or close a version and starts default workflow' do
-      post("/v1/objects/#{druid}/accession",
-           params:,
+      post("/v1/objects/#{druid}/accession?#{params.to_query}",
            headers: { 'Authorization' => "Bearer #{jwt}" })
       expect(response).to be_successful
       expect(EventFactory).to have_received(:create).with(
@@ -55,8 +54,7 @@
     end
 
     it 'can override the default workflow' do
-      post "/v1/objects/#{druid}/accession",
-           params: params.merge(workflow: 'accessionWF'),
+      post "/v1/objects/#{druid}/accession?#{params.merge(workflow: 'accessionWF').to_query}",
            headers: { 'Authorization' => "Bearer #{jwt}" }
       expect(response).to be_successful
       expect(workflow_client).to have_received(:create_workflow_by_name).with(druid, 'accessionWF', version: '1')
@@ -71,8 +69,7 @@
     end
 
     it 'opens and closes a version and starts default workflow' do
-      post("/v1/objects/#{druid}/accession",
-           params:,
+      post("/v1/objects/#{druid}/accession?#{params.to_query}",
            headers: { 'Authorization' => "Bearer #{jwt}" })
       expect(workflow_client).to have_received(:create_workflow_by_name).with(druid, default_start_accession_workflow, version: '2')
       expect(VersionService).to have_received(:open).with(cocina_object:, **params)
@@ -80,8 +77,7 @@
     end
 
     it 'can override the default workflow' do
-      post "/v1/objects/#{druid}/accession",
-           params: params.merge(workflow: 'accessionWF'),
+      post "/v1/objects/#{druid}/accession?#{params.merge(workflow: 'accessionWF').to_query}",
            headers: { 'Authorization' => "Bearer #{jwt}" }
       expect(workflow_client).to have_received(:create_workflow_by_name).with(druid, 'accessionWF', version: '2')
       expect(VersionService).to have_received(:open).with(cocina_object:, **params)
@@ -95,8 +91,7 @@
     end
 
     it 'closes a version and starts default workflow' do
-      post("/v1/objects/#{druid}/accession",
-           params:,
+      post("/v1/objects/#{druid}/accession?#{params.to_query}",
            headers: { 'Authorization' => "Bearer #{jwt}" })
       expect(response).to have_http_status(:success)
       expect(workflow_client).to have_received(:create_workflow_by_name).with(druid, default_start_accession_workflow, version: '1')
@@ -111,8 +106,7 @@
     end
 
     it 'returns an unacceptable response and does not start any workflows' do
-      post("/v1/objects/#{druid}/accession",
-           params:,
+      post("/v1/objects/#{druid}/accession?#{params.to_query}",
            headers: { 'Authorization' => "Bearer #{jwt}" })
       expect(EventFactory).to have_received(:create).with(
         { data: { workflow: 'assemblyWF' },
diff --git a/spec/requests/update_metadata_spec.rb b/spec/requests/update_metadata_spec.rb
index 25d843382..348558a64 100644
--- a/spec/requests/update_metadata_spec.rb
+++ b/spec/requests/update_metadata_spec.rb
@@ -794,7 +794,7 @@
           embargo: {
             view: 'world',
             download: 'world',
-            releaseDate: '2020-02-29'
+            releaseDate: '2020-02-29T07:00:00.000+00:00'
           }
         }
       )
@@ -807,7 +807,7 @@
           "type":"#{Cocina::Models::ObjectType.book}",
           "label":"This is my label","version":1,
           "access":{"view":"stanford","download":"stanford",
-            "embargo":{"view":"world","download":"world","releaseDate":"2020-02-29"}
+            "embargo":{"view":"world","download":"world","releaseDate":"2020-02-29T07:00:00.000+00:00"}
           },
           "administrative":{"releaseTags":[],"hasAdminPolicy":"#{apo_druid}"},
           "description":{
diff --git a/spec/requests/versions_spec.rb b/spec/requests/versions_spec.rb
index 92be16fff..ce47e6152 100644
--- a/spec/requests/versions_spec.rb
+++ b/spec/requests/versions_spec.rb
@@ -46,8 +46,7 @@
       end
 
       it 'closes the current version when posted to' do
-        post '/v1/objects/druid:mx123qw2323/versions/current/close',
-             params: close_params,
+        post "/v1/objects/druid:mx123qw2323/versions/current/close?#{close_params.to_query}",
              headers: { 'Authorization' => "Bearer #{jwt}" }
         expect(response).to have_http_status :ok
         expect(response.body).to match(/version 1 closed/)
@@ -64,8 +63,7 @@
       end
 
       it 'returns an error' do
-        post '/v1/objects/druid:mx123qw2323/versions/current/close',
-             params: close_params,
+        post "/v1/objects/druid:mx123qw2323/versions/current/close?#{close_params.to_query}",
              headers: { 'Authorization' => "Bearer #{jwt}" }
         expect(response).to have_http_status :unprocessable_entity
         expect(response.body).to eq(
@@ -95,8 +93,7 @@
       end
 
       it 'opens a new object version when posted to' do
-        post '/v1/objects/druid:mx123qw2323/versions',
-             params: open_params,
+        post "/v1/objects/druid:mx123qw2323/versions?#{open_params.to_query}",
              headers: { 'Authorization' => "Bearer #{jwt}" }
         expect(response).to be_successful
         expect(response.body).to equal_cocina_model(cocina_object)
@@ -116,8 +113,7 @@
       end
 
       it 'returns a bad request error' do
-        post '/v1/objects/druid:mx123qw2323/versions',
-             params: incomplete_params,
+        post "/v1/objects/druid:mx123qw2323/versions?#{incomplete_params.to_query}",
              headers: { 'Authorization' => "Bearer #{jwt}" }
         expect(response.body).to match('missing required parameters: description, significance')
         expect(response).to have_http_status :bad_request
@@ -131,8 +127,7 @@
       end
 
       it 'returns an error' do
-        post '/v1/objects/druid:mx123qw2323/versions',
-             params: open_params,
+        post "/v1/objects/druid:mx123qw2323/versions?#{open_params.to_query}",
              headers: { 'Authorization' => "Bearer #{jwt}" }
         expect(response.body).to eq('{"errors":[{"status":"422","title":"Unable to open version","detail":"Object net yet accessioned"}]}')
         expect(response).to have_http_status :unprocessable_entity
@@ -145,8 +140,7 @@
       end
 
       it 'returns an error' do
-        post '/v1/objects/druid:mx123qw2323/versions',
-             params: open_params,
+        post "/v1/objects/druid:mx123qw2323/versions?#{open_params.to_query}",
              headers: { 'Authorization' => "Bearer #{jwt}" }
         expect(response.body).to eq('{"errors":[{"status":"500","title":"Unable to open version due to preservation client error","detail":"Oops, a 500"}]}')
         expect(response).to have_http_status :internal_server_error