diff --git a/gnu/packages/python-xyz.scm b/gnu/packages/python-xyz.scm
index 2077d6d12a..331b80e9a6 100644
--- a/gnu/packages/python-xyz.scm
+++ b/gnu/packages/python-xyz.scm
@@ -11006,14 +11006,14 @@ (define-public python2-stem
 (define-public python-pyserial
   (package
     (name "python-pyserial")
-    (version "3.1.1")
+    (version "3.4")
     (source
       (origin
         (method url-fetch)
         (uri (pypi-uri "pyserial" version))
         (sha256
           (base32
-            "0k1nfdrxxkdlv4zgaqsdv8li0pj3gbh2pyxw8q2bsg6f9490amyn"))))
+            "09y68bczw324a4jb9a1cfwrbjhq179vnfkkkrybbksp0vqgl0bbf"))))
     (build-system python-build-system)
     (arguments
      '(#:tests? #f)) ; FIXME: 3/49 tests are failing.