diff --git a/app/templates/components/components/radios/template.njk b/app/templates/components/components/radios/template.njk
index 375dcfd3a..bab8ab7dc 100644
--- a/app/templates/components/components/radios/template.njk
+++ b/app/templates/components/components/radios/template.njk
@@ -43,14 +43,14 @@
     visuallyHiddenText: params.errorMessage.visuallyHiddenText
   }) | indent(2) | trim }}
 {% endif %}
-  <div class="govuk-radios {%- if params.classes %} {{ params.classes }}{% endif %}{%- if isConditional %} govuk-radios--conditional{% endif -%}"
+  <div class="usa-radios {%- if params.classes %} {{ params.classes }}{% endif %}{%- if isConditional %} usa-radios--conditional{% endif -%}"
     {%- for attribute, value in params.attributes %} {{ attribute }}="{{ value }}"{% endfor %}
     {%- if isConditional %} data-module="radios"{% endif -%}>
     {% for item in params.items %}
     {% set id = item.id if item.id else idPrefix + "-" + loop.index %}
     {% set conditionalId = "conditional-" + id %}
     {%- if item.divider %}
-    <div class="govuk-radios__divider">{{ item.divider }}</div>
+    <div class="usa-radios__divider">{{ item.divider }}</div>
     {%- else %}
     {% set hasHint = true if item.hint.text or item.hint.html %}
     {% set itemHintId = id + '-item-hint' %}
@@ -79,7 +79,7 @@
       {%- endif %}
     </div>
     {% if item.conditional %}
-      <div class="govuk-radios__conditional{% if not item.checked %} govuk-radios__conditional--hidden{% endif %}" id="{{ conditionalId }}">
+      <div class="usa-radios__conditional{% if not item.checked %} usa-radios__conditional--hidden{% endif %}" id="{{ conditionalId }}">
         {{ item.conditional.html | safe }}
       </div>
     {% endif %}
diff --git a/app/templates/components/list-entry.html b/app/templates/components/list-entry.html
index ac777484d..a17930379 100644
--- a/app/templates/components/list-entry.html
+++ b/app/templates/components/list-entry.html
@@ -36,9 +36,9 @@
             {% set autocomplete = "" %}
           {% endif %}
           {% if entry.errors %}
-            {% set label_classes = "govuk-input--numbered__label govuk-input--numbered__label--error" %}
+            {% set label_classes = "usa-input--numbered__label usa-input--numbered__label--error" %}
           {% else %}
-            {% set label_classes = "govuk-input--numbered__label" %}
+            {% set label_classes = "usa-input--numbered__label" %}
           {% endif %}
           {% set field_name = field.name + "-" + loop.index|string %}
           {{ entry(param_extensions={
@@ -48,7 +48,7 @@
               "html": '<span class="usa-sr-only">' + item_name + ' number </span>' + loop.index|string + '.',
               "classes": label_classes
             },
-            "classes": "govuk-input--numbered ",
+            "classes": "usa-input--numbered ",
             "value": field.data[loop.index0],
             "autocomplete": autocomplete
           }) }}
diff --git a/app/templates/views/cookies.html b/app/templates/views/cookies.html
index a591ce2f3..ffa032e38 100644
--- a/app/templates/views/cookies.html
+++ b/app/templates/views/cookies.html
@@ -126,7 +126,7 @@
             <legend class="govuk-fieldset__legend govuk-fieldset__legend--s">
               Do you want to accept analytics cookies?
             </legend>
-            <div class="govuk-radios govuk-radios--inline">
+            <div class="usa-radios usa-radios--inline">
               <div class="usa-radio">
                 <input class="usa-radio__input" id="cookies-analytics-yes" name="cookies-analytics" type="radio" value="on">
                 <label class="usa-radio__label" for="cookies-analytics-yes">
diff --git a/app/templates/views/user-profile/confirm.html b/app/templates/views/user-profile/confirm.html
index fb5ae2d05..207a27cb5 100644
--- a/app/templates/views/user-profile/confirm.html
+++ b/app/templates/views/user-profile/confirm.html
@@ -23,7 +23,7 @@
       </p>
       {% call form_wrapper() %}
         {{ form_field(param_extensions={
-            "classes": "govuk-input govuk-input--width-5",
+            "classes": "usa-input width-15",
             "attributes": {"data-module": "autofocus"}
         }) }}
 
diff --git a/tests/app/main/views/organizations/test_organizations.py b/tests/app/main/views/organizations/test_organizations.py
index ccaffda14..3abffc2fb 100644
--- a/tests/app/main/views/organizations/test_organizations.py
+++ b/tests/app/main/views/organizations/test_organizations.py
@@ -1536,7 +1536,7 @@ def test_view_edit_organization_billing_details(
     ]
     for label in labels:
         assert label.text.strip() in labels_list
-    textbox_names = page.find_all("input", class_="govuk-input ")
+    textbox_names = page.find_all("input", class_="usa-input ")
     names_list = [
         "billing_contact_email_addresses",
         "billing_contact_names",
diff --git a/tests/app/main/views/service_settings/test_service_settings.py b/tests/app/main/views/service_settings/test_service_settings.py
index 2284e61e3..22847e13c 100644
--- a/tests/app/main/views/service_settings/test_service_settings.py
+++ b/tests/app/main/views/service_settings/test_service_settings.py
@@ -4409,7 +4409,7 @@ def test_view_edit_service_billing_details(
     ]
     for label in labels:
         assert label.text.strip() in labels_list
-    textbox_names = page.find_all("input", class_="govuk-input ")
+    textbox_names = page.find_all("input", class_="usa-input ")
     names_list = [
         "billing_contact_email_addresses",
         "billing_contact_names",
diff --git a/tests/app/main/views/test_send.py b/tests/app/main/views/test_send.py
index 01318d940..69e68e882 100644
--- a/tests/app/main/views/test_send.py
+++ b/tests/app/main/views/test_send.py
@@ -81,11 +81,11 @@ def test_default_email_sender_is_checked_and_has_hint(
         ".set_sender", service_id=SERVICE_ONE_ID, template_id=fake_uuid
     )
 
-    assert page.select(".govuk-radios input")[0].has_attr("checked")
+    assert page.select(".usa-radios input")[0].has_attr("checked")
     assert (
-        normalize_spaces(page.select_one(".govuk-radios .usa-hint").text) == "(Default)"
+        normalize_spaces(page.select_one(".usa-radios .usa-hint").text) == "(Default)"
     )
-    assert not page.select(".govuk-radios input")[1].has_attr("checked")
+    assert not page.select(".usa-radios input")[1].has_attr("checked")
 
 
 def test_default_sms_sender_is_checked_and_has_hint(
@@ -98,11 +98,11 @@ def test_default_sms_sender_is_checked_and_has_hint(
         ".set_sender", service_id=SERVICE_ONE_ID, template_id=fake_uuid
     )
 
-    assert page.select(".govuk-radios input")[0].has_attr("checked")
+    assert page.select(".usa-radios input")[0].has_attr("checked")
     assert (
-        normalize_spaces(page.select_one(".govuk-radios .usa-hint").text) == "(Default)"
+        normalize_spaces(page.select_one(".usa-radios .usa-hint").text) == "(Default)"
     )
-    assert not page.select(".govuk-radios input")[1].has_attr("checked")
+    assert not page.select(".usa-radios input")[1].has_attr("checked")
 
 
 def test_default_sms_sender_is_checked_and_has_hint_when_there_are_no_inbound_numbers(
@@ -115,11 +115,11 @@ def test_default_sms_sender_is_checked_and_has_hint_when_there_are_no_inbound_nu
         ".set_sender", service_id=SERVICE_ONE_ID, template_id=fake_uuid
     )
 
-    assert page.select(".govuk-radios input")[0].has_attr("checked")
+    assert page.select(".usa-radios input")[0].has_attr("checked")
     assert (
-        normalize_spaces(page.select_one(".govuk-radios .usa-hint").text) == "(Default)"
+        normalize_spaces(page.select_one(".usa-radios .usa-hint").text) == "(Default)"
     )
-    assert not page.select(".govuk-radios input")[1].has_attr("checked")
+    assert not page.select(".usa-radios input")[1].has_attr("checked")
 
 
 def test_default_inbound_sender_is_checked_and_has_hint_with_default_and_receives_text(
@@ -133,13 +133,13 @@ def test_default_inbound_sender_is_checked_and_has_hint_with_default_and_receive
         ".set_sender", service_id=service_one["id"], template_id=fake_uuid
     )
 
-    assert page.select(".govuk-radios input")[0].has_attr("checked")
+    assert page.select(".usa-radios input")[0].has_attr("checked")
     assert (
-        normalize_spaces(page.select_one(".govuk-radios .usa-hint").text)
+        normalize_spaces(page.select_one(".usa-radios .usa-hint").text)
         == "(Default and receives replies)"
     )
-    assert not page.select(".govuk-radios input")[1].has_attr("checked")
-    assert not page.select(".govuk-radios input")[2].has_attr("checked")
+    assert not page.select(".usa-radios input")[1].has_attr("checked")
+    assert not page.select(".usa-radios input")[2].has_attr("checked")
 
 
 def test_sms_sender_has_receives_replies_hint(
@@ -153,13 +153,13 @@ def test_sms_sender_has_receives_replies_hint(
         ".set_sender", service_id=service_one["id"], template_id=fake_uuid
     )
 
-    assert page.select(".govuk-radios input")[0].has_attr("checked")
+    assert page.select(".usa-radios input")[0].has_attr("checked")
     assert (
-        normalize_spaces(page.select_one(".govuk-radios .usa-hint").text)
+        normalize_spaces(page.select_one(".usa-radios .usa-hint").text)
         == "(Default and receives replies)"
     )
-    assert not page.select(".govuk-radios input")[1].has_attr("checked")
-    assert not page.select(".govuk-radios input")[2].has_attr("checked")
+    assert not page.select(".usa-radios input")[1].has_attr("checked")
+    assert not page.select(".usa-radios input")[2].has_attr("checked")
 
 
 @pytest.mark.parametrize(