diff --git a/.changeset/rude-shrimps-wonder.md b/.changeset/rude-shrimps-wonder.md
new file mode 100644
index 0000000000..798cb060a2
--- /dev/null
+++ b/.changeset/rude-shrimps-wonder.md
@@ -0,0 +1,5 @@
+---
+'@swisspost/design-system-styles': patch
+---
+
+Corrected high contrast mode styles for `checkbox` and `radio-button`.
diff --git a/packages/styles/src/components/checkbox.scss b/packages/styles/src/components/checkbox.scss
index e4b43c308f..723ea45a0f 100644
--- a/packages/styles/src/components/checkbox.scss
+++ b/packages/styles/src/components/checkbox.scss
@@ -43,6 +43,7 @@ $checkbox-icon-indeterminate: url("data:image/svg+xml,<svg width='16' height='16
       background-color: Field;
       border-color: FieldText;
       color: FieldText;
+      transition: none;
     }
 
     &:not([disabled]) {
@@ -61,6 +62,10 @@ $checkbox-icon-indeterminate: url("data:image/svg+xml,<svg width='16' height='16
 
     &:checked,
     &:indeterminate {
+      @include utility-mx.high-contrast-mode() {
+        background-color: SelectedItem;
+      }
+
       &::after {
         background-color: currentColor;
 
diff --git a/packages/styles/src/components/header/index.scss b/packages/styles/src/components/header/index.scss
index 674e266c8e..99a0330eb9 100644
--- a/packages/styles/src/components/header/index.scss
+++ b/packages/styles/src/components/header/index.scss
@@ -4,7 +4,7 @@
 @use 'mixins' as *;
 
 post-header {
-  ul[slot="meta-navigation"] {
+  ul[slot='meta-navigation'] {
     gap: var(--post-core-dimension-4);
 
     @include media.max(lg) {
diff --git a/packages/styles/src/components/radio-button.scss b/packages/styles/src/components/radio-button.scss
index a4ba90479b..2b0f7a27a7 100644
--- a/packages/styles/src/components/radio-button.scss
+++ b/packages/styles/src/components/radio-button.scss
@@ -58,6 +58,10 @@ tokens.$default-map: components.$post-radio-button;
   }
 
   &:checked {
+    @include utility-mx.high-contrast-mode() {
+      background-color: SelectedItem;
+    }
+
     &::after {
       background-color: tokens.get('radio-button-enabled-fg');