diff --git a/platform.py b/platform.py
index e7af216a..78806c4a 100644
--- a/platform.py
+++ b/platform.py
@@ -53,7 +53,7 @@ def configure_default_packages(self, variables, targets):
                 self.packages["framework-cmsis"]["optional"] = False
 
         if "mbed" in frameworks:
-            self.packages["toolchain-gccarmnoneeabi"]["version"] = "~1.90201.0"
+            self.packages["toolchain-gccarmnoneeabi"]["version"] = "~1.120301.0"
 
         if "cmsis" in frameworks:
             assert build_mcu, ("Missing MCU field for %s" % board)