diff --git a/appveyor.yml b/appveyor.yml
index 23bf2da..001f5ee 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -12,7 +12,7 @@ environment:
 
 install:
   - cmd: git submodule update --init --recursive
-  - cmd: SET PATH=%PATH%;C:\Python36\Scripts
+  - cmd: SET PATH=C:\Python36\Scripts;%PATH%
   - cmd: pip3 install -U https://github.com/platformio/platformio/archive/develop.zip
   - cmd: platformio platform install file://.
 
diff --git a/boards/teensy40.json b/boards/teensy40.json
index 05da1ee..2ff6e8e 100644
--- a/boards/teensy40.json
+++ b/boards/teensy40.json
@@ -18,7 +18,7 @@
   ],
   "name": "Teensy 4.0",
   "upload": {
-    "maximum_ram_size": 1048576,
+    "maximum_ram_size": 524288,
     "maximum_size": 2031616,
     "protocol": "teensy-gui",
     "protocols": [
diff --git a/builder/frameworks/arduino.py b/builder/frameworks/arduino.py
index 5e88e85..af52657 100644
--- a/builder/frameworks/arduino.py
+++ b/builder/frameworks/arduino.py
@@ -65,7 +65,7 @@
 
 env.Replace(
     SIZEPROGREGEXP=r"^(?:\.text|\.text\.progmem|\.text\.itcm|\.data)\s+([0-9]+).*",
-    SIZEDATAREGEXP=r"^(?:\.usbdescriptortable|\.dmabuffers|\.usbbuffers|\.data|\.bss|\.bss\.dma|\.noinit|\.text\.itcm)\s+([0-9]+).*"
+    SIZEDATAREGEXP=r"^(?:\.usbdescriptortable|\.dmabuffers|\.usbbuffers|\.data|\.bss|\.noinit|\.text\.itcm|\.text\.itcm\.padding)\s+([0-9]+).*"
 )
 
 env.Append(
@@ -261,19 +261,19 @@
     ASFLAGS=env.get("CCFLAGS", [])[:]
 )
 
-if "cortex-m" in env.BoardConfig().get("build.cpu", ""):
-    board = env.subst("$BOARD")
-    math_lib = "arm_cortex%s_math"
-    if board in ("teensy35", "teensy36"):
-        math_lib = math_lib % "M4lf"
-    elif board in ("teensy30", "teensy31"):
-        math_lib = math_lib % "M4l"
-    elif board == "teensy40":
-        math_lib = math_lib % "M7lfsp"
-    else:
-        math_lib = math_lib % "M0l"
-
-    env.Prepend(LIBS=[math_lib])
+# if "cortex-m" in env.BoardConfig().get("build.cpu", ""):
+#     board = env.subst("$BOARD")
+#     math_lib = "arm_cortex%s_math"
+#     if board in ("teensy35", "teensy36"):
+#         math_lib = math_lib % "M4lf"
+#     elif board in ("teensy30", "teensy31"):
+#         math_lib = math_lib % "M4l"
+#     elif board == "teensy40":
+#         math_lib = math_lib % "M7lfsp"
+#     else:
+#         math_lib = math_lib % "M0l"
+
+#     env.Prepend(LIBS=[math_lib])
 
 # Teensy 2.x Core
 if BUILD_CORE == "teensy":
diff --git a/platform.json b/platform.json
index 863b3d4..8df4c43 100644
--- a/platform.json
+++ b/platform.json
@@ -12,7 +12,7 @@
     "type": "git",
     "url": "https://github.com/platformio/platform-teensy.git"
   },
-  "version": "4.6.0",
+  "version": "4.7.0",
   "packageRepositories": [
     "https://dl.bintray.com/platformio/dl-packages/manifest.json",
     "http://dl.platformio.org/packages/manifest.json"
@@ -41,7 +41,7 @@
     "framework-arduinoteensy": {
       "type": "framework",
       "optional": true,
-      "version": "~1.148.0"
+      "version": "~1.149.0"
     },
     "framework-mbed": {
       "type": "framework",