diff --git a/pkgs/development/libraries/armadillo/default.nix b/pkgs/development/libraries/armadillo/default.nix
index 8dec9827141..9f0f16d5cee 100644
--- a/pkgs/development/libraries/armadillo/default.nix
+++ b/pkgs/development/libraries/armadillo/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   pname = "armadillo";
-  version = "9.800.3";
+  version = "9.800.4";
 
   src = fetchurl {
     url = "mirror://sourceforge/arma/armadillo-${version}.tar.xz";
-    sha256 = "16bm1pa5a8wsk497y9s18dyi3hax03z6g2x2z19b6z0bi3ff30d4";
+    sha256 = "1vcgqshlah5cv1954r1jv02y2iyr0gi5jqc8zz8wmvgm56vm83mw";
   };
 
   nativeBuildInputs = [ cmake ];