diff --git a/gnu/packages/lisp-xyz.scm b/gnu/packages/lisp-xyz.scm
index 55602a0df78..dcd77c227ce 100644
--- a/gnu/packages/lisp-xyz.scm
+++ b/gnu/packages/lisp-xyz.scm
@@ -29269,7 +29269,7 @@ running into parallelism problems when having to change directory.")
 (define-public sbcl-simple-matrix
   (package
     (name "sbcl-simple-matrix")
-    (version "3.5")
+    (version "3.6")
     (source
      (origin
        (method git-fetch)
@@ -29278,7 +29278,7 @@ running into parallelism problems when having to change directory.")
              (commit (string-append "v" version))))
        (file-name (git-file-name "cl-simple-matrix" version))
        (sha256
-        (base32 "1zdj16vy1h24ypm7kjb20pzniclqm6xdndb5kh3f6kcgfsmc6m06"))))
+        (base32 "00ixjvq6gpcc3pppglb941mva05rwd41dvir5rqqdkzrzdnxgmpc"))))
     (build-system asdf-build-system/sbcl)
     (native-inputs (list sbcl-fiveam))
     (synopsis "Matrix library for Common Lisp")