diff --git a/.gitignore b/.gitignore
index ddd5d7d..c5ee64f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /armadillo-10.7.4.tar.xz
 /armadillo-10.8.2.tar.xz
+/armadillo-12.6.6.tar.xz
diff --git a/armadillo.spec b/armadillo.spec
index d18e277..dd463ae 100644
--- a/armadillo.spec
+++ b/armadillo.spec
@@ -1,6 +1,6 @@
 Name:           armadillo
-Version:        10.8.2
-Release:        4%{?dist}
+Version:        12.6.6
+Release:        1%{?dist}
 Summary:        Fast C++ matrix library with syntax similar to MATLAB and Octave
 
 License:        ASL 2.0
@@ -108,7 +108,7 @@ make -C "%{_vpath_builddir}"
 %doc armadillo_icon.png
 %doc mex_interface
 %doc armadillo_nicta_2010.pdf
-%doc rcpp_armadillo_csda_2014.pdf
+%doc armadillo_rcpp_2014.pdf
 %doc armadillo_joss_2016.pdf
 %doc armadillo_spcs_2017.pdf
 %doc armadillo_lncs_2018.pdf
@@ -116,6 +116,9 @@ make -C "%{_vpath_builddir}"
 
 
 %changelog
+* Sun Dec 31 2023 Ryan Curtin <ryan@ratml.org> - 12.6.6-1
+- Update to latest stable version.
+
 * Fri Jul 08 2022 Ryan Curtin <ryan@ratml.org> - 10.8.2-4
 - Re-enable ARPACK and HDF5 support since it is now available in EPEL9.
 
diff --git a/sources b/sources
index 624edba..3edb8e2 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (armadillo-10.8.2.tar.xz) = 720fadad491dfeeb894544b0305cd64a0e0402e66fc788949ecd54c0b1a3b9c3ede9f75b081f832931d59d2bd59529cebb9d5b57b8582df869765cac01c2979b
+SHA512 (armadillo-12.6.6.tar.xz) = bf6a3db60256aa9789b52d92b33971a43816e73cd079d08e35350fcb251c213fba59604263595f886c4228147e75dd9308a5208ab9b290bb094128a1aee5da3d