diff --git a/build-constraints.txt b/build-constraints.txt
new file mode 100644
index 0000000..b722ef6
--- /dev/null
+++ b/build-constraints.txt
@@ -0,0 +1 @@
+setuptools<82
diff --git a/cloudkittydashboard/dashboards/project/rating/views.py b/cloudkittydashboard/dashboards/project/rating/views.py
index 87ee80c..f1e9139 100644
--- a/cloudkittydashboard/dashboards/project/rating/views.py
+++ b/cloudkittydashboard/dashboards/project/rating/views.py
@@ -52,7 +52,7 @@ def get_data(self):
 
 def quote(request):
     pricing = 0.0
-    if request.is_ajax():
+    if request.headers.get('x-requested-with') == 'XMLHttpRequest':
         if request.method == 'POST':
             json_data = json.loads(request.body)
 
diff --git a/cloudkittydashboard/tests/test_predictive_pricing.py b/cloudkittydashboard/tests/test_predictive_pricing.py
index 38c898b..8fad16b 100644
--- a/cloudkittydashboard/tests/test_predictive_pricing.py
+++ b/cloudkittydashboard/tests/test_predictive_pricing.py
@@ -36,7 +36,7 @@ def setUp(self):
     def _test_quote_request_not_ajax_post(self, arg):
         request = mock.MagicMock()
         if arg == 'ajax':
-            request.is_ajax.return_value = False
+            request.headers.get.return_value = None  # Not an AJAX request
         elif arg == 'method':
             request.method == 'POST'
         resp = self.quote(request)
@@ -57,7 +57,7 @@ def test_quote_does_update_request_dict(self, api_mock):
                          {'other_key': None, 'service': 'test_service'}]
 
         request = mock.MagicMock()
-        request.is_ajax.return_value = True
+        request.headers.get.return_value = 'XMLHttpRequest'
         request.method = 'POST'
         request.body = json.dumps(body)
 
diff --git a/tools/pip.sh b/tools/pip.sh
new file mode 100755
index 0000000..eebd54e
--- /dev/null
+++ b/tools/pip.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+pip install 'pip==25.3'
+pip install "$@"
diff --git a/tox.ini b/tox.ini
index d783310..aa778f2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,11 +7,16 @@ ignore_basepython_conflict = True
 [testenv]
 basepython = python3
 usedevelop = True
-install_command = pip install -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2025.1} -U {opts} {packages}
+install_command = {toxinidir}/tools/pip.sh --build-constraint={toxinidir}/build-constraints.txt {opts} {packages}
 setenv =
    VIRTUAL_ENV={envdir}
-deps = -r{toxinidir}/requirements.txt
+deps = -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2025.1}
+       -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
+       pip==25.3  # Needed for build-constraints.txt
+       setuptools<82  # Due to deprecation of pkg_resources
+allowlist_externals =
+  {toxinidir}/tools/pip.sh
 commands =
    stestr run --slowest {posargs}
 
@@ -32,13 +37,16 @@ commands =
     coverage xml -o cover/coverage.xml
 
 [testenv:docs]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2025.1}
+       -r{toxinidir}/doc/requirements.txt
+       setuptools<82  # Due to deprecation of pkg_resources
 commands = sphinx-build -W --keep-going -b html doc/source doc/build/html
 
 [testenv:pdf-docs]
 deps = {[testenv:docs]deps}
 allowlist_externals =
   make
+  {toxinidir}/tools/pip.sh
 commands =
   sphinx-build -W --keep-going -b latex doc/source doc/build/pdf
   make -C doc/build/pdf
@@ -55,6 +63,6 @@ builtins = _
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build,.ropeproject,releasenotes
 
 [testenv:releasenotes]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 commands =
   sphinx-build -a -E -W -d releasenotes/build/doctrees --keep-going -b html releasenotes/source releasenotes/build/html