diff --git a/.ruby-version b/.ruby-version
index ef538c281..be94e6f53 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.1.2
+3.2.2
diff --git a/Dockerfile b/Dockerfile
index 128a9b6be..693edd2e3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-ARG ruby_version=3.1.2
+ARG ruby_version=3.2.2
 ARG base_image=ghcr.io/alphagov/govuk-ruby-base:$ruby_version
 ARG builder_image=ghcr.io/alphagov/govuk-ruby-builder:$ruby_version
 
diff --git a/Gemfile b/Gemfile
index 7e1cb6361..bb487b434 100644
--- a/Gemfile
+++ b/Gemfile
@@ -14,7 +14,7 @@ gem "govuk_app_config"
 gem "govuk_document_types"
 gem "govuk_schemas"
 gem "govuk_sidekiq"
-gem "jsonnet", "~>0.4.0" #  0.5 (current latest) does not currently compile on our CI machines
+gem "jsonnet"
 gem "json-schema", require: false
 gem "oj"
 gem "pg"
diff --git a/Gemfile.lock b/Gemfile.lock
index 323384e3d..296727644 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -243,7 +243,7 @@ GEM
     json (2.6.3)
     json-schema (4.1.1)
       addressable (>= 2.8)
-    jsonnet (0.4.0)
+    jsonnet (0.5.3)
       mini_portile2 (>= 2.2.0)
     jwt (2.7.1)
     kramdown (2.4.0)
@@ -782,7 +782,7 @@ DEPENDENCIES
   govuk_sidekiq
   govuk_test
   json-schema
-  jsonnet (~> 0.4.0)
+  jsonnet
   listen
   oj
   pact
diff --git a/spec/models/access_limit_spec.rb b/spec/models/access_limit_spec.rb
index d0d762193..c0b13215e 100644
--- a/spec/models/access_limit_spec.rb
+++ b/spec/models/access_limit_spec.rb
@@ -30,8 +30,8 @@
       it { is_expected.to be_valid }
     end
 
-    context "where users has an array with an integer" do
-      let(:organisations) { [123] }
+    context "where users has an array with an invalid UUID" do
+      let(:organisations) { %w[123] }
       it { is_expected.to be_invalid }
     end
   end