diff --git a/CHANGES.md b/CHANGES.md
index 6bbf5aa0..25b0cfea 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -7,6 +7,7 @@
   - STIR: 6.2.0
   - parallelproj: 1.9.1 (contains a fix for truncation of the TOF kernel)
   - CIL: v24.1.0
+  - Armadillo: 12.8.4 (as per latest Gadgetron, see #923)
 - docker image updates:
   - fix CUDA toolkit on GPU image
   - use CMake 3.29.6
diff --git a/version_config.cmake b/version_config.cmake
index 01fd4ef3..dcfd1d29 100644
--- a/version_config.cmake
+++ b/version_config.cmake
@@ -35,8 +35,8 @@ set(Boost_MD5 e193e5089060ed6ce5145c8eb05e67e3)
 
 
 ## Armadillo
-set(Armadillo_URL https://downloads.sourceforge.net/project/arma/armadillo-9.800.2.tar.xz)
-set(Armadillo_MD5 c2fa488ea069b9972363ebad16e51ab5)
+set(Armadillo_URL https://downloads.sourceforge.net/project/arma/armadillo-12.8.4.tar.xz)
+set(Armadillo_MD5 345f46a1e496d5c5d95acb01a9110f8b)
 
 ## FFTW3
 if(WIN32)