diff --git a/AGENTS.md b/AGENTS.md
index 01621b4..9d500ec 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -128,7 +128,8 @@ chip-independently. Per-chip values (from `nrf54l<chip>_s145_v10.ld`):
 | nRF54L10 | `0x8000 – 0xC7000` | `0xC7000 – 0xCE000` | `0xCF000` | `0xDA800` |
 | nRF54L15 | `0x8000 – 0x147000` | `0x147000 – 0x14E000` | `0x14F000` | `0x15A800` |
 
-RAM ends at `0x2003FF80`; the bootloader keeps its BLE peer data and the
+App RAM ends at `0x20017F80` / `0x2002FF80` / `0x2003FF80` (L05 96 KB, L10
+192 KB, L15 256 KB); the bootloader keeps its BLE peer data and the
 double-reset marker in the last 128 bytes. Both sides must agree, so change
 the layout in the bootloader repo's `linker/` scripts in the same step.
 
diff --git a/README.md b/README.md
index 1c9c1d2..868623a 100644
--- a/README.md
+++ b/README.md
@@ -85,7 +85,8 @@ of RRAM.
 | nRF54L15 | `0x0 – 0x8000` | `0x8000 – 0x147000` | `0x147000 – 0x14E000` | `0x14F000` | `0x15A800` |
 
 RAM: `0x20000000 – 0x20004800` belongs to the SoftDevice, the application
-runs from `0x20004800` to `0x2003FF80`; the last 128 bytes hold the
+runs from `0x20004800` to `0x20017F80` / `0x2002FF80` / `0x2003FF80` (L05 /
+L10 / L15); the last 128 bytes of RAM hold the
 bootloader's BLE peer data and double-reset marker. The layout matches the
 [nRF54_Bootloader](https://github.com/meshtastic/nRF54_Bootloader) linker
 scripts.
diff --git a/changelog.md b/changelog.md
index f3d7aa0..3d53700 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## 0.5.1 — 2026-10-26
+
+- nRF54L05 and nRF54L10: application RAM ends at `0x20017F80` / `0x2002FF80`
+  instead of the nRF54L15's `0x2003FF80`, which is past the end of their RAM.
+  The stack and the bootloader's peer data and double-reset marker are now
+  inside RAM, where the bootloader expects them
+
 ## 0.5.0 — 2026-10-26
 
 Requires s145 10.0.1, bootloader 0.5.0 and a platform with the 10.0.1 boards.
diff --git a/cores/nRF5/linker/nrf54l05_s145_v10.ld b/cores/nRF5/linker/nrf54l05_s145_v10.ld
index 9c3ca80..6609d0d 100644
--- a/cores/nRF5/linker/nrf54l05_s145_v10.ld
+++ b/cores/nRF5/linker/nrf54l05_s145_v10.ld
@@ -6,10 +6,10 @@ GROUP(-lgcc -lc -lnosys)
 MEMORY
 {
   FLASH (rx) : ORIGIN = 0x00008000, LENGTH = 0x3f000
-  RAM (rwx) :  ORIGIN = 0x20004800, LENGTH = 0x3B780
+  RAM (rwx) :  ORIGIN = 0x20004800, LENGTH = 0x13780
 
   /* Bootloader peer data and double-reset marker, must stay untouched by the app */
-  NOINIT (rwx) :  ORIGIN = 0x2003FF80, LENGTH = 0x78
+  NOINIT (rwx) :  ORIGIN = 0x20017F80, LENGTH = 0x78
 }
 
 __softdevice_start__ = 0x0005A800;
diff --git a/cores/nRF5/linker/nrf54l10_s145_v10.ld b/cores/nRF5/linker/nrf54l10_s145_v10.ld
index 1136491..624f905 100644
--- a/cores/nRF5/linker/nrf54l10_s145_v10.ld
+++ b/cores/nRF5/linker/nrf54l10_s145_v10.ld
@@ -6,10 +6,10 @@ GROUP(-lgcc -lc -lnosys)
 MEMORY
 {
   FLASH (rx) : ORIGIN = 0x00008000, LENGTH = 0xbf000
-  RAM (rwx) :  ORIGIN = 0x20004800, LENGTH = 0x3B780
+  RAM (rwx) :  ORIGIN = 0x20004800, LENGTH = 0x2B780
 
   /* Bootloader peer data and double-reset marker, must stay untouched by the app */
-  NOINIT (rwx) :  ORIGIN = 0x2003FF80, LENGTH = 0x78
+  NOINIT (rwx) :  ORIGIN = 0x2002FF80, LENGTH = 0x78
 }
 
 __softdevice_start__ = 0x000DA800;
diff --git a/package.json b/package.json
index 6cf52e4..abe1c64 100644
--- a/package.json
+++ b/package.json
@@ -28,5 +28,5 @@
     "url": "https://github.com/meshtastic/nRF54_Arduino.git"
   },
   "license": "LGPL-2.1-or-later",
-  "version": "0.5.0"
+  "version": "0.5.1"
 }