diff --git a/gnu/packages/gnome.scm b/gnu/packages/gnome.scm
index c6437ce450..8d2265b10d 100644
--- a/gnu/packages/gnome.scm
+++ b/gnu/packages/gnome.scm
@@ -5810,7 +5810,7 @@ (define-public upower
            python
            ;; For tests.
            python-dbus
-           python-dbusmock
+           python-dbusmock-minimal
            python-packaging
            python-pygobject
            umockdev
diff --git a/gnu/packages/gtk.scm b/gnu/packages/gtk.scm
index b5246c8b3b..761b65fd1f 100644
--- a/gnu/packages/gtk.scm
+++ b/gnu/packages/gtk.scm
@@ -849,7 +849,7 @@ (define-public at-spi2-core
             gobject-introspection
             gsettings-desktop-schemas
             pkg-config
-            python-dbusmock
+            python-dbusmock-minimal
             python-pytest
             python-wrapper))
      (synopsis "Assistive Technology Service Provider Interface, core components")
@@ -880,7 +880,8 @@ (define-public at-spi2-core-with-documentation
                                   "/share/doc'\n")))))))))
     (native-inputs
      (modify-inputs (package-native-inputs at-spi2-core)
-       (append gi-docgen python python-sphinx)))
+       (append gi-docgen python python-sphinx)
+       (replace "python-dbusmock" python-dbusmock)))
     (properties (alist-delete 'hidden?
                               (package-properties at-spi2-core)))))
 
diff --git a/gnu/packages/polkit.scm b/gnu/packages/polkit.scm
index 2f733dd703..337d9b9a73 100644
--- a/gnu/packages/polkit.scm
+++ b/gnu/packages/polkit.scm
@@ -158,7 +158,7 @@ (define-public polkit
            perl
            pkg-config
            python
-           python-dbusmock))
+           python-dbusmock-minimal))
     (home-page "https://www.freedesktop.org/wiki/Software/polkit/")
     (synopsis "Authorization API for privilege management")
     (description "Polkit is an application-level toolkit for defining and
diff --git a/gnu/packages/python-xyz.scm b/gnu/packages/python-xyz.scm
index db113caae7..44b3f89574 100644
--- a/gnu/packages/python-xyz.scm
+++ b/gnu/packages/python-xyz.scm
@@ -27374,14 +27374,14 @@ (define-public python-dbus-python
 (define-public python-dbusmock
   (package
     (name "python-dbusmock")
-    (version "0.25.0")
+    (version "0.30.0")
     (source
      (origin
        (method url-fetch)
        (uri (pypi-uri "python-dbusmock" version))
        (sha256
         (base32
-         "1nwl0gzzds2g1w1gfxfzlgrkb5hr1rrdyn619ml25c6b1rjyfk3g"))))
+         "1hanz6x76jq66ypdirga5h15zjs67kwysl6rmsf0i22dbdqrxdfv"))))
     (build-system python-build-system)
     (arguments
      (list #:modules `((guix build python-build-system)
@@ -27392,6 +27392,9 @@ (define-public python-dbusmock
            #~(modify-phases %standard-phases
                (add-after 'unpack 'patch-paths
                  (lambda* (#:key inputs #:allow-other-keys)
+                   (substitute* "tests/test_api.py"
+                     (("/usr/bin/python3")
+                      (which "python3")))
                    (substitute* "tests/test_code.py"
                      (("/bin/bash")
                       (which "bash")))
@@ -27418,11 +27421,11 @@ (define-public python-dbusmock
                                           status))
                                  (loop)))))))))))))
     (native-inputs
-     (list dbus python-pytest which))
+     (list dbus python-pytest upower which))
     (inputs
      (list dbus))
     (propagated-inputs
-     (list python-dbus python-pygobject))
+     (list python-dbus-python python-pygobject))
     (home-page "https://github.com/martinpitt/python-dbusmock")
     (synopsis "Python library for mock D-Bus objects")
     (description "python-dbusmock allows for the easy creation of mock objects on
@@ -27432,6 +27435,16 @@ (define-public python-dbusmock
 services to what you expect in your tests.")
     (license license:lgpl3+)))
 
+(define-public python-dbusmock-minimal
+  (package
+    (inherit python-dbusmock)
+    (name "python-dbusmock-minimal")
+    (arguments
+     (substitute-keyword-arguments (package-arguments python-dbusmock)
+       ((#:tests? _ #t) #f)))
+    (native-inputs (list which))
+    (properties '((hidden? . #t)))))
+
 (define-public python-jsonplus
   (package
     (name "python-jsonplus")