diff --git a/.changeset/fuzzy-dryers-speak.md b/.changeset/fuzzy-dryers-speak.md
new file mode 100644
index 000000000..2d908cd68
--- /dev/null
+++ b/.changeset/fuzzy-dryers-speak.md
@@ -0,0 +1,5 @@
+---
+"@ledgerhq/device-management-kit-sample": patch
+---
+
+Pretty print buffers in device actions logs
diff --git a/apps/sample/src/components/DeviceActionsView/DeviceActionResponse.tsx b/apps/sample/src/components/DeviceActionsView/DeviceActionResponse.tsx
index 4c30add87..3417253fc 100644
--- a/apps/sample/src/components/DeviceActionsView/DeviceActionResponse.tsx
+++ b/apps/sample/src/components/DeviceActionsView/DeviceActionResponse.tsx
@@ -1,5 +1,6 @@
 import React from "react";
 import {
+  bufferToHexaString,
   type DeviceActionIntermediateValue,
   type DeviceActionState,
   DeviceActionStatus,
@@ -38,6 +39,14 @@ const TooltipTitle = styled(Text).attrs({
   flex-grow: 0;
 `;
 
+function bufferStringifyReplacer(_key: string, value: unknown): unknown {
+  // Pretty-print buffers to make signatures or public keys readable
+  if (value instanceof Uint8Array) {
+    return bufferToHexaString(value);
+  }
+  return value;
+}
+
 /**
  * Component to display an event emitted by a device action.
  */
@@ -69,7 +78,7 @@ export function DeviceActionResponse<
         content={
           <Text color="neutral.c00" whiteSpace="pre-wrap">
             Arguments:{"\n"}
-            {JSON.stringify(args, null, 2)}
+            {JSON.stringify(args, bufferStringifyReplacer, 2)}
           </Text>
         }
       >
@@ -96,7 +105,11 @@ export function DeviceActionResponse<
           ? inspect(props.error, { depth: null })
           : props.deviceActionState.status === DeviceActionStatus.Error
             ? inspect(props.deviceActionState.error, { depth: null })
-            : JSON.stringify(props.deviceActionState, null, 2)}
+            : JSON.stringify(
+                props.deviceActionState,
+                bufferStringifyReplacer,
+                2,
+              )}
       </Text>
       {!isError &&
       props.deviceActionState.status === DeviceActionStatus.Pending ? (