diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index c367ea7a..1d4adedd 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -14,8 +14,7 @@ jobs:
     strategy:
       matrix:
         config:
-          - ["Py3.8-Plone5.2", "3.8", "5.2"]
-          - ["Py3.8-Plone6.0", "3.8", "6.0"]
+          - ["Py3.8-Plone6.0", "3.8"]
     runs-on: ubuntu-latest
     name: ${{ matrix.config[0] }}
     steps:
@@ -42,17 +41,13 @@ jobs:
         run: |
           sudo locale-gen en_US.UTF-8 nl_NL@euro
           python -m venv .
-          ln -s requirements-${{ matrix.config[2] }}.txt requirements.txt
           bin/pip install -r requirements.txt
-          ln -s versions-${{ matrix.config[2] }}.cfg versions.cfg
           bin/buildout -c .github.cfg
       - name: Pre commit
         uses: pre-commit/action@v2.0.0
-        if: ${{ matrix.config[2] == '5.2' }}
       - name: Code Analysis
         run: |
           bin/code-analysis
-        if: ${{ matrix.config[2] == '5.2' }}
       - name: Test
         run: |
           bin/coverage run bin/test -s osha.oira
diff --git a/docs/changes.rst b/docs/changes.rst
index a9ebaa86..16d88a02 100644
--- a/docs/changes.rst
+++ b/docs/changes.rst
@@ -1,11 +1,13 @@
 Changelog
 =========
 
-10.0.6 (unreleased)
+10.1.0 (unreleased)
 -------------------
 
 - Support openpyxl 3.x
   [reinhardt]
+- Remove support and testing infrastructure for Plone 5.2.
+  [thet]
 
 
 10.0.5 (2024-12-09)
diff --git a/requirements-5.2.txt b/requirements-5.2.txt
deleted file mode 100644
index 6001582a..00000000
--- a/requirements-5.2.txt
+++ /dev/null
@@ -1 +0,0 @@
--r https://raw.githubusercontent.com/euphorie/Euphorie/main/requirements-5.2.txt
diff --git a/requirements-6.0.txt b/requirements.txt
similarity index 100%
rename from requirements-6.0.txt
rename to requirements.txt
diff --git a/setup.py b/setup.py
index 0962bb0e..19407784 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@
 import os
 
 
-version = "10.0.6.dev0"
+version = "10.1.0.dev0"
 
 setup(
     name="osha.oira",
@@ -18,7 +18,6 @@
         "Development Status :: 5 - Production/Stable",
         "Environment :: Web Environment",
         "Framework :: Plone",
-        "Framework :: Plone :: 5.2",
         "Framework :: Plone :: 6.0",
         "License :: OSI Approved :: GNU General Public License (GPL)",
         "Programming Language :: Python :: 3",
diff --git a/src/osha/oira/client/browser/client.py b/src/osha/oira/client/browser/client.py
index 128c0950..5872c631 100644
--- a/src/osha/oira/client/browser/client.py
+++ b/src/osha/oira/client/browser/client.py
@@ -69,6 +69,14 @@ def validate_ticket(self):
         if ticket != expected:
             raise Unauthorized("Invalid ticket")
 
+    @property
+    def page(self):
+        return int(self.request.get("page", "1"))
+
+    @property
+    def page_limit(self):
+        return int(self.request.get("page_limit", "10"))
+
     def __call__(self):
         """Returns a json meant to be consumed by pat-autosuggest.
 
@@ -178,7 +186,8 @@ def results(self):
             user = api.user.get_current()
 
             if (
-                not q or q in all_users["id"] or q in all_users["text"].lower()
+                self.page == 1
+                and (not q or q in all_users["id"] or q in all_users["text"].lower())
             ) and api.user.has_permission("Manage portal"):
                 results.append(all_users)
 
@@ -198,7 +207,9 @@ def results(self):
                 else:
                     query["path"] = "/".join((query["path"], q))
 
-            brains = self.filter_permission(catalog(**query), query, user)
+            b_start = (self.page - 1) * self.page_limit
+            brains = catalog(**query, b_start=b_start, b_size=self.page_limit)
+            brains = self.filter_permission(brains, query, user)
 
             for brain in brains:
                 results.extend(self._get_mailing_lists_for(brain))
diff --git a/src/osha/oira/client/tests/test_mailing_lists.py b/src/osha/oira/client/tests/test_mailing_lists.py
index dcb990c4..c5658cba 100644
--- a/src/osha/oira/client/tests/test_mailing_lists.py
+++ b/src/osha/oira/client/tests/test_mailing_lists.py
@@ -65,6 +65,64 @@ def test_mailing_lists(self):
             results,
         )
 
+    def test_mailing_lists_batching(self):
+        request = self.request.clone()
+        request.form = {"user_id": "admin", "page_limit": "2"}
+        with mock.patch.object(
+            MailingListsJson,
+            "addresses_view",
+            return_value=GroupToAddresses(context=self.portal.client, request=request),
+        ):
+            view = MailingListsJson(context=self.portal.client, request=request)
+            results = view.results
+
+        # Result = 3, because the "general" mailing list is always added
+        # on page one for admin users.
+        self.assertEqual(len(results), 3)
+        self.assertEqual(
+            results[0],
+            {"id": "general|QWxsIHVzZXJz", "text": "All users [0 subscribers]"},
+        )
+        self.assertEqual(
+            results[1],
+            {
+                "id": "nl/test/second-survey|U2Vjb25kIFN1cnZleQ==",
+                "text": "Second Survey (nl/test/second-survey) [0 subscribers]",
+            },
+        )
+        self.assertEqual(
+            results[2],
+            {
+                "id": "nl/ict/software-development|U29mdHdhcmUgZGV2ZWxvcG1lbnQ=",
+                "text": "Software development (nl/ict/software-development) [0 subscribers]",  # noqa: E501
+            },
+        )
+
+        request.form = {"user_id": "admin", "page_limit": "2", "page": "2"}
+        with mock.patch.object(
+            MailingListsJson,
+            "addresses_view",
+            return_value=GroupToAddresses(context=self.portal.client, request=request),
+        ):
+            view = MailingListsJson(context=self.portal.client, request=request)
+            results = view.results
+
+        self.assertEqual(len(results), 2)
+        self.assertEqual(
+            results[0],
+            {
+                "id": "nl-nl|VGhlIE5ldGhlcmxhbmRzIChubCk=",
+                "text": "The Netherlands (nl) [0 subscribers]",
+            },
+        )
+        self.assertEqual(
+            results[1],
+            {
+                "id": "nl-fr|VGhlIE5ldGhlcmxhbmRzIChmcik=",
+                "text": "The Netherlands (fr) [0 subscribers]",
+            },
+        )
+
     def test_group_to_addresses(self):
         user = Account(loginname="leni@example.nl", password="secret")
         Session.add(user)
diff --git a/versions-5.2.cfg b/versions-5.2.cfg
deleted file mode 100644
index dfe438f6..00000000
--- a/versions-5.2.cfg
+++ /dev/null
@@ -1,45 +0,0 @@
-[buildout]
-extends = https://raw.githubusercontent.com/euphorie/Euphorie/main/versions-5.2.cfg
-
-[versions]
-# Use latest Euphorie version for development.
-Euphorie =
-
-# LDAP fixtures
-pas.plugins.ldap = 1.8.0
-node.ext.ldap= 1.0b12
-
-# LDAP fixtures Known Good Set
-bda.cache = 1.3.0
-node = 0.9.26
-node.ext.ugm = 0.9.12
-odict = 1.7.0
-plumber = 1.6
-pyasn1 = 0.4.8
-pyasn1-modules = 0.2.8
-python-ldap = 3.3.1
-python-Levenshtein = 0.12.2
-python-memcached = 1.59
-yafowil = 2.3.3
-yafowil.plone = 4.0.0a3
-yafowil.widget.array = 1.6.1
-yafowil.widget.dict = 1.8
-yafowil.yaml = 1.3.1
-
-# automatically picked.
-alchemy-mock = 0.4.3
-argparse = 1.4.0
-createcoverage = 1.5
-flake8 = 7.0.0
-mccabe = 0.7.0
-mobile.sniffer = 1.0.0
-passlib = 1.7.4
-plone.formwidget.recaptcha = 2.3.0
-plone.recipe.codeanalysis = 3.0.1
-Products.MemcachedManager = 1.2.1
-pycodestyle = 2.11.1
-pyflakes = 3.2.0
-slc.zopescript = 1.1.4
-zope.app.publication = 4.5
-zope.authentication = 4.5.0
-zope.error = 4.6
diff --git a/versions-6.0.cfg b/versions.cfg
similarity index 100%
rename from versions-6.0.cfg
rename to versions.cfg