diff --git a/.github/workflows/integration-enterprise.yaml b/.github/workflows/integration-enterprise.yaml
index 24b253c4a..a3e20551d 100644
--- a/.github/workflows/integration-enterprise.yaml
+++ b/.github/workflows/integration-enterprise.yaml
@@ -33,6 +33,7 @@ jobs:
         - 'kong/kong-gateway:3.12'
         - 'kong/kong-gateway:3.13'
         - 'kong/kong-gateway:3.14'
+        - 'kong/kong-gateway:3.15'
         - 'kong/kong-gateway-dev:latest'
         router_flavor:
           - 'traditional_compatible'
diff --git a/tests/integration/dump_test.go b/tests/integration/dump_test.go
index e1d3b0a31..974e30bca 100644
--- a/tests/integration/dump_test.go
+++ b/tests/integration/dump_test.go
@@ -1577,6 +1577,11 @@ func Test_Dump_ClonedPluginDefinitions(t *testing.T) {
 			runWhen(t, tc.runWhen, tc.runWhenVersion)
 
 			reset(t)
+			// Sync the plugin definitions first, in a separate run, so Kong
+			// has them registered before any plugin references them.
+			require.NoError(t, sync(ctx,
+				"testdata/sync/054-cloned-plugin-definitions/plugin-definitions.yaml",
+				"--include-plugin-definitions"))
 			require.NoError(t, sync(ctx,
 				"testdata/sync/054-cloned-plugin-definitions/kong.yaml", "--include-plugin-definitions"))
 
@@ -1634,6 +1639,14 @@ func Test_Dump_CustomPluginDefinitions(t *testing.T) {
 			runWhen(t, tc.runWhen, tc.runWhenVersion)
 
 			reset(t)
+			// Sync the plugin definitions first, in a separate run, so Kong
+			// has them registered before any plugin references them. Doing
+			// this in a single sync is racy: a plugin may be created before
+			// its (custom) definition is ready, yielding an intermittent
+			// 404 "No plugin named '<name>'".
+			require.NoError(t, sync(ctx,
+				"testdata/sync/055-custom-plugin-definitions/plugin-definitions.yaml",
+				"--include-plugin-definitions"))
 			require.NoError(t, sync(ctx,
 				"testdata/sync/055-custom-plugin-definitions/kong.yaml", "--include-plugin-definitions"))
 
diff --git a/tests/integration/testdata/sync/054-cloned-plugin-definitions/plugin-definitions.yaml b/tests/integration/testdata/sync/054-cloned-plugin-definitions/plugin-definitions.yaml
new file mode 100644
index 000000000..34edc020d
--- /dev/null
+++ b/tests/integration/testdata/sync/054-cloned-plugin-definitions/plugin-definitions.yaml
@@ -0,0 +1,15 @@
+_format_version: "3.0"
+cloned_plugins:
+- name: new-file-log
+  ref: file-log
+  priority: 100
+  tags:
+  - tag1
+  - tag2
+  - select-me
+- name: new-acl
+  ref: acl
+  priority: 1000
+  tags:
+  - tag1
+  - tag2
diff --git a/tests/integration/testdata/sync/055-custom-plugin-definitions/plugin-definitions.yaml b/tests/integration/testdata/sync/055-custom-plugin-definitions/plugin-definitions.yaml
new file mode 100644
index 000000000..f5f088612
--- /dev/null
+++ b/tests/integration/testdata/sync/055-custom-plugin-definitions/plugin-definitions.yaml
@@ -0,0 +1,37 @@
+_format_version: "3.0"
+custom_plugins:
+- name: set-header
+  handler: |
+    return {
+      VERSION = "1.0,0",
+      PRIORITY = 500,
+      access = function(self, config)
+        kong.service.request.set_header(config.name, config.value)
+      end
+    }
+  schema: |
+    return {
+      name = "set-header",
+      fields = {
+        { protocols = require("kong.db.schema.typedefs").protocols_http },
+        {
+          config = {
+            type = "record",
+            fields = {
+              { name = { description = "The name of the header to set.", type = "string", required = true, }, },
+              { value = { description = "The value for the header.", type = "string", required = true, }, },
+            },
+          },
+        },
+      },
+    }
+  tags:
+  - tag1
+  - tag2
+  - select-me
+- name: col-dbless
+  handler: 'return { PRIORITY = 1000, VERSION = "1.0.0" }'
+  schema: 'return { name = "col-dbless", fields = { { config = { type = "record", fields = {} } } } }'
+  tags:
+  - tag1
+  - tag2