diff --git a/tests/blink/platformio.ini b/tests/blink/platformio.ini
index 2344571..89a95b8 100644
--- a/tests/blink/platformio.ini
+++ b/tests/blink/platformio.ini
@@ -10,9 +10,9 @@
 default_envs = xiao_nrf54l15, xiao_nrf54l15_sense, nrf54l15dk, nrf54l10dk, nrf54l05dk
 
 [env]
-; Until the platform with the s145 10.0.1 boards is released, build against its s145-10.0.1
-; branch; switch back to master after that.
-platform = https://github.com/meshtastic/platform-nordicnrf54.git#s145-10.0.1
+; Pinned to a release tag: CI caches the installed platform under a key derived from this file,
+; so an unpinned URL keeps building against whatever platform was cached first.
+platform = https://github.com/meshtastic/platform-nordicnrf54.git#v0.5.0
 framework = arduino
 ; Force PlatformIO to use *this* checkout of the framework rather than
 ; cloning the published one. Path is relative to the project dir