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diff --git a/packages/eui/.loki/reference/chrome_mobile_Navigation_EuiButtonGroup_High_Contrast.png b/packages/eui/.loki/reference/chrome_mobile_Navigation_EuiButtonGroup_High_Contrast.png
index a2bc349f62d..d4bfcc2496a 100644
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diff --git a/packages/eui/changelogs/upcoming/8734.md b/packages/eui/changelogs/upcoming/8734.md
new file mode 100644
index 00000000000..dc08ebf7a9d
--- /dev/null
+++ b/packages/eui/changelogs/upcoming/8734.md
@@ -0,0 +1,2 @@
+- Updated the `font-weight` of default `EuiFilterButton` and `EuiButtonGroupButton` to `450`
+
diff --git a/packages/eui/src/components/button/button_group/button_group_button.styles.ts b/packages/eui/src/components/button/button_group/button_group_button.styles.ts
index ed1d6865121..8ef0693d727 100644
--- a/packages/eui/src/components/button/button_group/button_group_button.styles.ts
+++ b/packages/eui/src/components/button/button_group/button_group_button.styles.ts
@@ -287,7 +287,7 @@ export const euiButtonGroupButtonStyles = (euiThemeContext: UseEuiTheme) => {
     compressed: css`
       ${logicalCSS('height', compressedButtonHeight)}
       line-height: ${compressedButtonHeight};
-      font-weight: ${euiTheme.font.weight.regular};
+      font-weight: ${euiTheme.font.weight.medium};
 
       /* Offset the background color from the border by clipping background to before the padding starts */
       padding: ${isRefreshVariant
diff --git a/packages/eui/src/components/filter_group/filter_button.styles.ts b/packages/eui/src/components/filter_group/filter_button.styles.ts
index 5041bbbea89..b78fa30a9e8 100644
--- a/packages/eui/src/components/filter_group/filter_button.styles.ts
+++ b/packages/eui/src/components/filter_group/filter_button.styles.ts
@@ -205,7 +205,7 @@ export const euiFilterButtonStyles = (euiThemeContext: UseEuiTheme) => {
     `,
     hasActiveFilters: css`
       font-weight: ${isRefreshVariant
-        ? euiTheme.font.weight.regular
+        ? euiTheme.font.weight.medium
         : euiTheme.font.weight.bold};
     `,
   };