diff --git a/gnu/packages/serialization.scm b/gnu/packages/serialization.scm
index 3064e385e2..40b3d1bae0 100644
--- a/gnu/packages/serialization.scm
+++ b/gnu/packages/serialization.scm
@@ -225,6 +225,26 @@ that implements both the msgpack and msgpack-rpc specifications.")
     (home-page "https://github.com/libmpack/libmpack-lua")
     (synopsis "Lua bindings for the libmpack binary serialization library")))
 
+(define-public lua5.1-libmpack
+  (package (inherit lua-libmpack)
+    (name "lua5.1-libmpack")
+    (arguments
+     (substitute-keyword-arguments (package-arguments lua-libmpack)
+       ((#:make-flags flags)
+        `(let* ((lua-version ,(package-version lua-5.1))
+                (lua-major+minor ,(version-major+minor (package-version lua-5.1))))
+           (list "CC=gcc"
+                 "USE_SYSTEM_LUA=yes"
+                 (string-append "MPACK_LUA_VERSION=" lua-version)
+                 (string-append "MPACK_LUA_VERSION_NOPATCH=" lua-major+minor)
+                 (string-append "PREFIX="
+                                (assoc-ref %outputs "out"))
+                 (string-append "LUA_CMOD_INSTALLDIR="
+                                (assoc-ref %outputs "out")
+                                "/lib/lua/" lua-major+minor))))))
+    (inputs
+     `(("lua" ,lua-5.1)))))
+
 (define-public lua5.2-libmpack
   (package (inherit lua-libmpack)
     (name "lua5.2-libmpack")
@@ -418,7 +438,7 @@ to generate and parse.  The two primary functions are @code{cbor.loads} and
 (define-public flatbuffers
   (package
     (name "flatbuffers")
-    (version "1.9.0")
+    (version "1.10.0")
     (source
       (origin
         (method url-fetch)
@@ -426,7 +446,7 @@ to generate and parse.  The two primary functions are @code{cbor.loads} and
                             version ".tar.gz"))
         (sha256
          (base32
-          "1qs7sa9q4q6hs12yp875lvrv6393178qcmqs1ziwmjk088g4k9aw"))))
+          "0z4swldxs0s31hnkqdhsbfmc8vx3p7zsvmqaw4l31r2iikdy651p"))))
     (build-system cmake-build-system)
     (arguments
      '(#:build-type "Release"
@@ -435,7 +455,7 @@ to generate and parse.  The two primary functions are @code{cbor.loads} and
                             (assoc-ref %outputs "out") "/lib"))))
     (home-page "https://google.github.io/flatbuffers/")
     (synopsis "Memory-efficient serialization library")
-    (description "FlatBuffers is a cross platform serialization library for C++,
+    (description "FlatBuffers is a cross-platform serialization library for C++,
 C#, C, Go, Java, JavaScript, PHP, and Python.  It was originally created for
 game development and other performance-critical applications.")
     (license license:asl2.0)))