diff --git a/speculos/cxlib/stax-api-level-cx-21.elf b/speculos/cxlib/stax-api-level-cx-21.elf
new file mode 100644
index 00000000..c5b562f8
Binary files /dev/null and b/speculos/cxlib/stax-api-level-cx-21.elf differ
diff --git a/speculos/fonts/stax-fonts-21.bin b/speculos/fonts/stax-fonts-21.bin
new file mode 120000
index 00000000..1ff63ee0
--- /dev/null
+++ b/speculos/fonts/stax-fonts-21.bin
@@ -0,0 +1 @@
+stax-fonts-20.bin
\ No newline at end of file
diff --git a/src/launcher.c b/src/launcher.c
index 4ba4a05e..b036b5aa 100644
--- a/src/launcher.c
+++ b/src/launcher.c
@@ -818,7 +818,7 @@ int main(int argc, char *argv[])
         sdk_version != SDK_API_LEVEL_10 && sdk_version != SDK_API_LEVEL_11 &&
         sdk_version != SDK_API_LEVEL_12 && sdk_version != SDK_API_LEVEL_13 &&
         sdk_version != SDK_API_LEVEL_14 && sdk_version != SDK_API_LEVEL_15 &&
-        sdk_version != SDK_API_LEVEL_20) {
+        sdk_version != SDK_API_LEVEL_20 && sdk_version != SDK_API_LEVEL_21) {
       errx(1, "invalid SDK version for the Ledger Stax");
     }
     break;
diff --git a/src/sdk.h b/src/sdk.h
index cd3f70b2..21474684 100644
--- a/src/sdk.h
+++ b/src/sdk.h
@@ -35,6 +35,7 @@ typedef enum {
   SDK_API_LEVEL_18,
   SDK_API_LEVEL_19,
   SDK_API_LEVEL_20,
+  SDK_API_LEVEL_21,
   SDK_COUNT
 } sdk_version_t;