diff --git a/app/javascript/mastodon/features/account/components/follow_request_note.jsx b/app/javascript/mastodon/features/account/components/follow_request_note.jsx
index 9c20f1e0626..27ebb8fd64b 100644
--- a/app/javascript/mastodon/features/account/components/follow_request_note.jsx
+++ b/app/javascript/mastodon/features/account/components/follow_request_note.jsx
@@ -24,12 +24,12 @@ export default class FollowRequestNote extends ImmutablePureComponent {
         </div>
 
         <div className='follow-request-banner__action'>
-          <button type='button' className='button button-tertiary button--confirmation' onClick={onAuthorize}>
+          <button type='button' className='button button-secondary button--confirmation' onClick={onAuthorize}>
             <Icon id='check' icon={CheckIcon} />
             <FormattedMessage id='follow_request.authorize' defaultMessage='Authorize' />
           </button>
 
-          <button type='button' className='button button-tertiary button--destructive' onClick={onReject}>
+          <button type='button' className='button button-secondary button--destructive' onClick={onReject}>
             <Icon id='times' icon={CloseIcon} />
             <FormattedMessage id='follow_request.reject' defaultMessage='Reject' />
           </button>
diff --git a/app/javascript/mastodon/features/navigation_panel/components/disabled_account_banner.tsx b/app/javascript/mastodon/features/navigation_panel/components/disabled_account_banner.tsx
index 9103170fa75..6cb450d1d61 100644
--- a/app/javascript/mastodon/features/navigation_panel/components/disabled_account_banner.tsx
+++ b/app/javascript/mastodon/features/navigation_panel/components/disabled_account_banner.tsx
@@ -75,7 +75,7 @@ export const DisabledAccountBanner: React.FC = () => {
       </a>
       <button
         type='button'
-        className='button button--block button-tertiary'
+        className='button button--block button-secondary'
         onClick={handleLogOutClick}
       >
         <FormattedMessage
diff --git a/app/javascript/mastodon/features/navigation_panel/components/sign_in_banner.tsx b/app/javascript/mastodon/features/navigation_panel/components/sign_in_banner.tsx
index 470b806cbc5..ebcb532bb44 100644
--- a/app/javascript/mastodon/features/navigation_panel/components/sign_in_banner.tsx
+++ b/app/javascript/mastodon/features/navigation_panel/components/sign_in_banner.tsx
@@ -46,7 +46,7 @@ export const SignInBanner: React.FC = () => {
         <a
           href={sso_redirect}
           data-method='post'
-          className='button button--block button-tertiary'
+          className='button button--block button-secondary'
         >
           <FormattedMessage
             id='sign_in_banner.sso_redirect'
@@ -98,7 +98,7 @@ export const SignInBanner: React.FC = () => {
         />
       </p>
       {signupButton}
-      <a href='/auth/sign_in' className='button button--block button-tertiary'>
+      <a href='/auth/sign_in' className='button button--block button-secondary'>
         <FormattedMessage id='sign_in_banner.sign_in' defaultMessage='Login' />
       </a>
     </div>
diff --git a/app/javascript/mastodon/features/ui/components/bundle_column_error.jsx b/app/javascript/mastodon/features/ui/components/bundle_column_error.jsx
index beaf1856382..2461028d8be 100644
--- a/app/javascript/mastodon/features/ui/components/bundle_column_error.jsx
+++ b/app/javascript/mastodon/features/ui/components/bundle_column_error.jsx
@@ -98,7 +98,7 @@ class BundleColumnError extends PureComponent {
             <div className='error-column__message__actions'>
               {errorType === 'network' && <Button onClick={this.handleRetry}><FormattedMessage id='bundle_column_error.retry' defaultMessage='Try again' /></Button>}
               {errorType === 'error' && <CopyButton value={stacktrace}><FormattedMessage id='bundle_column_error.copy_stacktrace' defaultMessage='Copy error report' /></CopyButton>}
-              <Link to='/' className={classNames('button', { 'button-tertiary': errorType !== 'routing' })}><FormattedMessage id='bundle_column_error.return' defaultMessage='Go back home' /></Link>
+              <Link to='/' className={classNames('button', { 'button-secondary': errorType !== 'routing' })}><FormattedMessage id='bundle_column_error.return' defaultMessage='Go back home' /></Link>
             </div>
           </div>
         </div>
diff --git a/app/javascript/mastodon/features/ui/components/modal_placeholder.tsx b/app/javascript/mastodon/features/ui/components/modal_placeholder.tsx
index 13ec6ca2c82..9901ab6492b 100644
--- a/app/javascript/mastodon/features/ui/components/modal_placeholder.tsx
+++ b/app/javascript/mastodon/features/ui/components/modal_placeholder.tsx
@@ -46,7 +46,7 @@ export const ModalPlaceholder: React.FC<{
                   defaultMessage='Try again'
                 />
               </Button>
-              <Button onClick={handleClose} className='button button-tertiary'>
+              <Button onClick={handleClose} className='button button-secondary'>
                 <FormattedMessage
                   id='bundle_modal_error.close'
                   defaultMessage='Close'
diff --git a/app/javascript/mastodon/features/ui/components/navigation_bar.tsx b/app/javascript/mastodon/features/ui/components/navigation_bar.tsx
index a542bd1f680..def1835c3e0 100644
--- a/app/javascript/mastodon/features/ui/components/navigation_bar.tsx
+++ b/app/javascript/mastodon/features/ui/components/navigation_bar.tsx
@@ -104,7 +104,7 @@ const LoginOrSignUp: React.FC = () => {
         <a
           href={sso_redirect}
           data-method='post'
-          className='button button--block button-tertiary'
+          className='button button--block button-secondary'
         >
           <FormattedMessage
             id='sign_in_banner.sso_redirect'
@@ -143,7 +143,7 @@ const LoginOrSignUp: React.FC = () => {
     return (
       <div className='ui__navigation-bar__sign-up'>
         {signupButton}
-        <a href='/auth/sign_in' className='button button-tertiary'>
+        <a href='/auth/sign_in' className='button button-secondary'>
           <FormattedMessage
             id='sign_in_banner.sign_in'
             defaultMessage='Login'
diff --git a/app/javascript/styles/mastodon-light/variables.scss b/app/javascript/styles/mastodon-light/variables.scss
index 5dad233a5d3..e0542065c81 100644
--- a/app/javascript/styles/mastodon-light/variables.scss
+++ b/app/javascript/styles/mastodon-light/variables.scss
@@ -16,8 +16,6 @@ $grey-600: hsl(240deg, 8%, 33%); // Trout
   $ui-button-secondary-color: $grey-600,
   $ui-button-secondary-border-color: $grey-600,
   $ui-button-secondary-focus-color: $white,
-  $ui-button-tertiary-color: $blurple-500,
-  $ui-button-tertiary-border-color: $blurple-500,
 
   $emojis-requiring-inversion: 'chains'
 );
diff --git a/app/javascript/styles/mastodon/_variables.scss b/app/javascript/styles/mastodon/_variables.scss
index 6cd7848b619..03760972b2c 100644
--- a/app/javascript/styles/mastodon/_variables.scss
+++ b/app/javascript/styles/mastodon/_variables.scss
@@ -36,11 +36,6 @@ $ui-button-secondary-border-color: $blurple-500 !default;
 $ui-button-secondary-focus-border-color: $blurple-300 !default;
 $ui-button-secondary-focus-color: $blurple-300 !default;
 
-$ui-button-tertiary-color: $blurple-300 !default;
-$ui-button-tertiary-border-color: $blurple-300 !default;
-$ui-button-tertiary-focus-background-color: $blurple-600 !default;
-$ui-button-tertiary-focus-color: $white !default;
-
 // Keep this filter a SCSS variable rather than
 // a CSS Custom Property due to this Safari bug:
 // https://github.com/mdn/browser-compat-data/issues/25914#issuecomment-2676190245
diff --git a/app/javascript/styles/mastodon/components.scss b/app/javascript/styles/mastodon/components.scss
index 895f96075b2..1693a68201c 100644
--- a/app/javascript/styles/mastodon/components.scss
+++ b/app/javascript/styles/mastodon/components.scss
@@ -243,50 +243,6 @@
     }
   }
 
-  &.button-tertiary {
-    background: transparent;
-    padding: 6px 17px;
-    color: $ui-button-tertiary-color;
-    border: 1px solid $ui-button-tertiary-border-color;
-
-    &:active,
-    &:focus,
-    &:hover {
-      background-color: $ui-button-tertiary-focus-background-color;
-      color: $ui-button-tertiary-focus-color;
-      border: 0;
-      padding: 7px 18px;
-    }
-
-    &:disabled {
-      opacity: 0.5;
-    }
-
-    &.button--confirmation {
-      color: var(--clr-text-success);
-      border-color: var(--clr-text-success);
-
-      &:active,
-      &:focus,
-      &:hover {
-        background: var(--clr-bg-primary);
-        color: var(--clr-text-primary);
-      }
-    }
-
-    &.button--destructive {
-      color: var(--clr-text-error);
-      border-color: var(--clr-text-error);
-
-      &:active,
-      &:focus,
-      &:hover {
-        background: var(--clr-bg-success-strong);
-        color: var(--clr-text-on-success-strong);
-      }
-    }
-  }
-
   &.button--block {
     width: 100%;
   }
@@ -9920,11 +9876,6 @@ noscript {
         flex-grow: 1;
       }
     }
-
-    .button-tertiary {
-      background: color.change($ui-base-color, $alpha: 0.15);
-      backdrop-filter: blur(8px);
-    }
   }
 
   &__action {
diff --git a/app/views/admin/domain_blocks/confirm_suspension.html.haml b/app/views/admin/domain_blocks/confirm_suspension.html.haml
index e82026d3a2b..5b56c1903f6 100644
--- a/app/views/admin/domain_blocks/confirm_suspension.html.haml
+++ b/app/views/admin/domain_blocks/confirm_suspension.html.haml
@@ -18,5 +18,5 @@
                           domain: @domain_block.domain
 
   .actions
-    = link_to t('.cancel'), admin_instances_path, class: 'button button-tertiary'
+    = link_to t('.cancel'), admin_instances_path, class: 'button button-secondary'
     = f.button :submit, t('.confirm'), class: 'button button--dangerous', name: :confirm
diff --git a/app/views/admin/reports/actions/preview.html.haml b/app/views/admin/reports/actions/preview.html.haml
index 5a90bf1b8f6..bfd7fd5a409 100644
--- a/app/views/admin/reports/actions/preview.html.haml
+++ b/app/views/admin/reports/actions/preview.html.haml
@@ -76,7 +76,7 @@
     %hr.spacer/
 
   .actions
-    = link_to t('admin.reports.cancel'), admin_report_path(@report), class: 'button button-tertiary'
+    = link_to t('admin.reports.cancel'), admin_report_path(@report), class: 'button button-secondary'
     = form.button t('admin.reports.confirm'),
                   name: :confirm,
                   class: 'button',
diff --git a/app/views/auth/registrations/rules.html.haml b/app/views/auth/registrations/rules.html.haml
index 59e7c9072fb..a5a96c57378 100644
--- a/app/views/auth/registrations/rules.html.haml
+++ b/app/views/auth/registrations/rules.html.haml
@@ -27,4 +27,4 @@
   .stacked-actions
     - accept_path = @invite_code.present? ? public_invite_url(invite_code: @invite_code, accept: @accept_token) : new_user_registration_path(accept: @accept_token)
     = link_to t('auth.rules.accept'), accept_path, class: 'button'
-    = link_to t('auth.rules.back'), root_path, class: 'button button-tertiary'
+    = link_to t('auth.rules.back'), root_path, class: 'button button-secondary'
diff --git a/app/views/settings/imports/show.html.haml b/app/views/settings/imports/show.html.haml
index dd18ac2168c..40b06e6efb1 100644
--- a/app/views/settings/imports/show.html.haml
+++ b/app/views/settings/imports/show.html.haml
@@ -11,5 +11,5 @@
 
 .simple_form
   .actions
-    = link_to t('generic.cancel'), settings_import_path(@bulk_import), method: :delete, class: 'button button-tertiary'
+    = link_to t('generic.cancel'), settings_import_path(@bulk_import), method: :delete, class: 'button button-secondary'
     = link_to t('generic.confirm'), confirm_settings_import_path(@bulk_import), method: :post, class: 'button'