diff --git a/.drone.yml b/.drone.yml
index 093e78e96c..034f1d6044 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -113,8 +113,8 @@ steps:
 
   commands:
     - echo "Installing required build dependencies"
-    - apk add --update --no-cache make py3-sphinx py3-myst-parser py3-pip py3-paho-mqtt $(cat platypush/install/requirements/alpine.txt)
-    - pip install -U hid sphinx-rtd-theme sphinx-book-theme
+    - apk add --update --no-cache make py3-sphinx py3-myst-parser py3-pip $(cat platypush/install/requirements/alpine.txt)
+    - pip install -U sphinx-rtd-theme sphinx-book-theme
     - pip install .
     - mkdir -p /docs/current
     - export APPDIR=$PWD
diff --git a/platypush/backend/ping/manifest.yaml b/platypush/backend/ping/manifest.yaml
index 6c59f9224e..d9900d385e 100644
--- a/platypush/backend/ping/manifest.yaml
+++ b/platypush/backend/ping/manifest.yaml
@@ -3,6 +3,12 @@ manifest:
     platypush.message.event.ping.HostDownEvent: if a host stops responding ping requests
     platypush.message.event.ping.HostUpEvent: if a host starts responding ping requests
   install:
-    pip: []
+    apt:
+      - iputils-ping
+    dnf:
+      - iputils
+    pacman:
+      - iputils
+
   package: platypush.backend.ping
   type: backend
diff --git a/platypush/plugins/ping/manifest.yaml b/platypush/plugins/ping/manifest.yaml
index 8d7984be39..57800cd41e 100644
--- a/platypush/plugins/ping/manifest.yaml
+++ b/platypush/plugins/ping/manifest.yaml
@@ -1,6 +1,12 @@
 manifest:
   events: {}
   install:
-    pip: []
+    apt:
+      - iputils-ping
+    dnf:
+      - iputils
+    pacman:
+      - iputils
+
   package: platypush.plugins.ping
   type: plugin
diff --git a/platypush/utils/mock/modules.py b/platypush/utils/mock/modules.py
index a84299acbf..14aed19abb 100644
--- a/platypush/utils/mock/modules.py
+++ b/platypush/utils/mock/modules.py
@@ -45,6 +45,7 @@ mock_imports = [
     "graphyte",
     "grpc",
     "gunicorn",
+    "hid",
     "httplib2",
     "icalendar",
     "imapclient",
@@ -60,6 +61,7 @@ mock_imports = [
     "keras",
     "linode_api4",
     "luma",
+    "marshmallow_dataclass",
     "mpd",
     "ndef",
     "nfc",