diff --git a/GorgonMeducer.perf_counter.pdsc b/GorgonMeducer.perf_counter.pdsc
index 0970489..d24aaf2 100644
--- a/GorgonMeducer.perf_counter.pdsc
+++ b/GorgonMeducer.perf_counter.pdsc
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 
-<package schemaVersion="1.7.28" xmlns:xs="http://www.w3.org/2001/XMLSchema-instance" xs:noNamespaceSchemaLocation="https://raw.githubusercontent.com/Open-CMSIS-Pack/Open-CMSIS-Pack-Spec/v1.7.28/schema/PACK.xsd">
+<package schemaVersion="1.7.37" xmlns:xs="http://www.w3.org/2001/XMLSchema-instance" xs:noNamespaceSchemaLocation="https://raw.githubusercontent.com/Open-CMSIS-Pack/Open-CMSIS-Pack-Spec/v1.7.37/schema/PACK.xsd">
   <vendor>GorgonMeducer</vendor>
   <name>perf_counter</name>
   <description>A dedicated performance counter for the Cortex-M Systick. It shares the SysTick with users' original SysTick function without interfering with it. This library will bring new functionalities, such as performance counter, APIs for delay, clock() defined in time.h etc.</description>