diff --git a/Gemfile b/Gemfile
index f9b7756a7..7a952fe7a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -18,7 +18,7 @@ gem 'assembly-objectfile', '~> 1.5'
 # We don't require this by default, because we need it to load after hydrus models
 # or we'll get a superclass mismatch for Hydrus::Item
 gem 'dor-services', '~> 7.1', require: false
-gem 'dor-services-client', '~> 1.1'
+gem 'dor-services-client', '~> 1.9.2'
 gem 'rubydora', '~> 2.1'
 gem 'bagit', '~> 0.4'
 gem 'blacklight', '~> 6.19'
diff --git a/Gemfile.lock b/Gemfile.lock
index 8a78216af..6220b7dff 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -196,12 +196,13 @@ GEM
       stanford-mods (>= 2.3.1)
       stanford-mods-normalizer (~> 0.1)
       systemu (~> 2.6)
-    dor-services-client (1.8.0)
+    dor-services-client (1.9.2)
       activesupport (>= 4.2, < 6)
       deprecation
       faraday (~> 0.15)
       moab-versioning (~> 4.0)
       nokogiri (~> 1.8)
+      zeitwerk (~> 2.1)
     dor-workflow-client (3.2.0)
       activesupport (>= 3.2.1, < 6)
       deprecation (~> 0)
@@ -539,6 +540,7 @@ GEM
     xml-simple (1.1.5)
     xpath (3.2.0)
       nokogiri (~> 1.8)
+    zeitwerk (2.1.6)
 
 PLATFORMS
   ruby
@@ -565,7 +567,7 @@ DEPENDENCIES
   devise-remote-user (~> 1.0)
   dlss-capistrano
   dor-services (~> 7.1)
-  dor-services-client (~> 1.1)
+  dor-services-client (~> 1.9.2)
   dynamic_form
   equivalent-xml
   factory_bot_rails
diff --git a/app/models/hydrus/item.rb b/app/models/hydrus/item.rb
index a9d49b443..d234dd40c 100644
--- a/app/models/hydrus/item.rb
+++ b/app/models/hydrus/item.rb
@@ -170,7 +170,7 @@ def resubmit
   #   - Other options:
   #       :no_super   Used to prevent super() during testing.
   def open_new_version(opts = {})
-    raise "#{cannot_do_message(:open_new_version)}\nItem is not accessioned" unless is_accessioned
+    raise "#{cannot_do_message(:open_new_version)}\nItem is not accessioned" unless version_openeable?
     # Store the time when the object was initially published.
     self.initial_publish_time = publish_time if is_initial_version
 
@@ -179,7 +179,7 @@ def open_new_version(opts = {})
     vers_md_upd_info[:significance] = opts[:significance] || :major
     vers_md_upd_info[:description] = opts[:description] || ''
     # Use the dor-services-client to open a new version, passing along args needed by Hydrus
-    Dor::Services::Client.object(pid).open_new_version(assume_accessioned: should_treat_as_accessioned, vers_md_upd_info: vers_md_upd_info)
+    Dor::Services::Client.object(pid).version.open(assume_accessioned: should_treat_as_accessioned, vers_md_upd_info: vers_md_upd_info)
     # Varying behavior: remediations vs ordinary user edits.
     if opts[:is_remediation]
       # Just log the event.
@@ -207,7 +207,7 @@ def close_version(opts = {})
     # We want to start accessioning only if ...
     sa = !!opts[:is_remediation] # ... we are running a remediation and
     sa = false if should_treat_as_accessioned # ... we are not in development or test
-    Dor::Services::Client.object(pid).close_version(version_num: version_id, start_accession: sa)
+    Dor::Services::Client.object(pid).version.close(version_num: version_id, start_accession: sa)
   end
 
   # indicates if this item has an accepted terms of deposit, or if the supplied
diff --git a/app/models/hydrus/processable.rb b/app/models/hydrus/processable.rb
index 85c582d00..b95f113af 100644
--- a/app/models/hydrus/processable.rb
+++ b/app/models/hydrus/processable.rb
@@ -64,24 +64,12 @@ def should_start_assembly_wf
     Dor::Config.hydrus.start_assembly_wf
   end
 
-  # Returns true if the most recent version of the object has been accessioned.
-  def is_accessioned
-    # Basic tests:
-    #   - Must be published before it can be accessioned.
-    #   - For local development and automated testing, treat published as
-    #     equivalent to accessioned.
+  # Returns true if a new version can be opened for the object.
+  def version_openeable?
     return false unless is_published
-    return true if should_treat_as_accessioned
-
-    # Return false unless has been accessioned at least once.
-    # accessioned lifecyle is set in the last step in the accessionWF.
-    return false unless workflow_client.lifecycle(REPO, pid, 'accessioned')
-
-    # Return false if accessionWF has been started for most current version and there are there are any incomplete workflow steps.
-    return false if workflow_client.active_lifecycle(REPO, pid, 'submitted')
-
-    # Accessioned.
-    true
+    # For testing, this avoids Dor::Services::Client.
+    return false if should_treat_as_accessioned
+    Dor::Services::Client.object(pid).version.openeable?(assume_accessioned: should_treat_as_accessioned)
   end
 
   # Returns a string -- the datetime when the object achived the published
diff --git a/app/views/hydrus_items/_actions_box_show.html.erb b/app/views/hydrus_items/_actions_box_show.html.erb
index cba42941e..d4ff301b9 100644
--- a/app/views/hydrus_items/_actions_box_show.html.erb
+++ b/app/views/hydrus_items/_actions_box_show.html.erb
@@ -77,7 +77,7 @@
     </p>
 
   <!-- Open new version. -->
-  <% elsif @fobj.is_accessioned && can?(:edit, @fobj) %>
+  <% elsif @fobj.version_openeable? && can?(:edit, @fobj) %>
     <p>
       <%= button_to "Open new version",
                     open_new_version_item_path(@fobj),
diff --git a/spec/models/hydrus/item_spec.rb b/spec/models/hydrus/item_spec.rb
index d6e264144..806558fc5 100644
--- a/spec/models/hydrus/item_spec.rb
+++ b/spec/models/hydrus/item_spec.rb
@@ -1112,7 +1112,7 @@
     # More significant testing is done at the integration level.
     context 'when the item has not been accessioned' do
       before do
-        allow(item).to receive(:is_accessioned).and_return(false)
+        allow(item).to receive(:version_openeable?).and_return(false)
       end
 
       it 'raises an exception' do
@@ -1121,20 +1121,23 @@
     end
 
     context 'when it has been accessioned' do
-      let(:object_client) { instance_double(Dor::Services::Client::Object, open_new_version: true) }
+      let(:object_client) { instance_double(Dor::Services::Client::Object) }
+
+      let(:version_client) { instance_double(Dor::Services::Client::ObjectVersion, open: true) }
 
       before do
         item.submitted_for_publish_time = HyTime.now_datetime
         item.visibility = 'stanford'
-        allow(item).to receive(:is_accessioned).and_return(true)
+        allow(item).to receive(:version_openeable?).and_return(true)
         allow(Dor::Services::Client).to receive(:object).and_return(object_client)
+        allow(object_client).to receive(:version).and_return(version_client)
         allow(item).to receive(:uncomplete_workflow_steps)
       end
 
       it 'calls the client and sets prior_visibility to the old visibility value' do
         expect(item).to receive(:start_hydrus_wf)
         item.open_new_version
-        expect(object_client).to have_received(:open_new_version)
+        expect(version_client).to have_received(:open)
         expect(item.prior_visibility).to eq 'stanford'
       end
     end
@@ -1148,16 +1151,19 @@
       end
     end
     context 'when item is not initial version' do
-      let(:object_client) { instance_double(Dor::Services::Client::Object, close_version: true) }
+      let(:object_client) { instance_double(Dor::Services::Client::Object) }
+
+      let(:version_client) { instance_double(Dor::Services::Client::ObjectVersion, close: true) }
 
       before do
         allow(item).to receive(:is_initial_version).and_return(false)
         allow(Dor::Services::Client).to receive(:object).and_return(object_client)
+        allow(object_client).to receive(:version).and_return(version_client)
       end
 
       it 'calls the client and sets prior_visibility to the old visibility value' do
         item.close_version
-        expect(object_client).to have_received(:close_version).with(version_num: '1', start_accession: false)
+        expect(version_client).to have_received(:close).with(version_num: '1', start_accession: false)
       end
     end
   end
diff --git a/spec/models/hydrus/processable_spec.rb b/spec/models/hydrus/processable_spec.rb
index 6857070b5..5ca86cacd 100644
--- a/spec/models/hydrus/processable_spec.rb
+++ b/spec/models/hydrus/processable_spec.rb
@@ -88,32 +88,41 @@
     end
   end
 
-  describe 'is_accessioned()' do
-    let(:wfs) { instance_double(Dor::Workflow::Client) }
-    before do
-      allow(Dor::Config.workflow).to receive(:client).and_return(wfs)
-    end
+  describe 'version_openeable?' do
+    let(:object_client) { instance_double(Dor::Services::Client::Object) }
+    let(:version_client) { instance_double(Dor::Services::Client::ObjectVersion) }
 
-    it 'can exercise all logic branches' do
-      # At each stage, we set a stub, call is_accessioned(), and then reverse the stub.
-      # Not published: false.
-      allow(@go).to receive(:is_published).and_return(false)
-      expect(@go.is_accessioned).to eq(false)
+    before do
       allow(@go).to receive(:is_published).and_return(true)
-      # Running in development or test mode: true.
-      allow(@go).to receive(:should_treat_as_accessioned).and_return(true)
-      expect(@go.is_accessioned).to eq(true)
       allow(@go).to receive(:should_treat_as_accessioned).and_return(false)
-      # Never accessioned: false.
-      allow(wfs).to receive(:lifecycle).with('dor', @go.pid, 'accessioned').and_return(false)
-      expect(@go.is_accessioned).to eq(false)
-      allow(wfs).to receive(:lifecycle).with('dor', @go.pid, 'accessioned').and_return(true)
-      # AccessionWF active for current version: true
-      allow(wfs).to receive(:active_lifecycle).with('dor', @go.pid, 'submitted').and_return(true)
-      expect(@go.is_accessioned).to eq(false)
-      allow(wfs).to receive(:active_lifecycle).with('dor', @go.pid, 'submitted').and_return(false)
-      # Survived all tests: true.
-      expect(@go.is_accessioned).to eq(true)
+      allow(version_client).to receive(:openeable?).and_return(true)
+      allow(Dor::Services::Client).to receive(:object).and_return(object_client)
+      allow(object_client).to receive(:version).and_return(version_client)
+    end
+
+    context 'when item has not been published' do
+      before do
+        allow(@go).to receive(:is_published).and_return(false)
+      end
+
+      it 'returns false' do
+        expect(@go.version_openeable?).to eq(false)
+      end
+    end
+    context 'when published, but dor-services-app reports a new version cannot be opened' do
+      before do
+        allow(version_client).to receive(:openeable?).and_return(false)
+      end
+
+      it 'returns false' do
+        expect(@go.version_openeable?).to eq(false)
+      end
+    end
+
+    context 'when published and dor-services-app reports a new version can be opened' do
+      it 'returns true' do
+        expect(@go.version_openeable?).to eq(true)
+      end
     end
   end