diff --git a/builder/main.py b/builder/main.py
index b301747..fa32383 100644
--- a/builder/main.py
+++ b/builder/main.py
@@ -47,7 +47,7 @@ def _parse_size(value):
     return value
 
 
-@functools.lru_cache
+@functools.lru_cache(maxsize=None)
 def _parse_ld_sizes(ldscript_path):
     assert ldscript_path
     result = {}
diff --git a/platform.json b/platform.json
index d79dc00..9a006c3 100644
--- a/platform.json
+++ b/platform.json
@@ -17,7 +17,7 @@
     "type": "git",
     "url": "https://github.com/platformio/platform-espressif8266.git"
   },
-  "version": "4.0.0",
+  "version": "4.0.1",
   "frameworks": {
     "arduino": {
       "package": "framework-arduinoespressif8266",