diff --git a/.buildbot/appimage/Dockerfile b/.buildbot/appimage/Dockerfile
index c4dde327..2674952c 100644
--- a/.buildbot/appimage/Dockerfile
+++ b/.buildbot/appimage/Dockerfile
@@ -7,7 +7,8 @@ RUN apt-get install -yq --no-install-suggests --no-install-recommends \
     build-essential libcap-dev libssl-dev \
     python-all-dev python-setuptools wget \
     git gtk-update-icon-cache \
-    binutils-multiarch crossbuild-essential-armhf crossbuild-essential-arm64
+    binutils-multiarch crossbuild-essential-armhf crossbuild-essential-arm64 \
+    python-six
 
 RUN dpkg --add-architecture armhf
 RUN dpkg --add-architecture arm64
diff --git a/.buildbot/tox-bionic/Dockerfile b/.buildbot/tox-bionic/Dockerfile
index 1acf58dc..af7c2002 100644
--- a/.buildbot/tox-bionic/Dockerfile
+++ b/.buildbot/tox-bionic/Dockerfile
@@ -8,7 +8,8 @@ RUN apt-get install -yq --no-install-suggests --no-install-recommends \
     software-properties-common build-essential libcap-dev libffi-dev \
     libssl-dev python-all-dev python-setuptools \
     python3-dev python3-pip python3.8 python3.8-dev python3.8-venv \
-    python-msgpack python-qt4 language-pack-en qt5dxcb-plugin tor xvfb
+    python-msgpack python-qt4 language-pack-en qt5dxcb-plugin tor xvfb \
+    python3-six
 
 RUN apt-get install -yq sudo
 
diff --git a/.buildbot/tox-focal/Dockerfile b/.buildbot/tox-focal/Dockerfile
index fecc0819..a9a2af0d 100644
--- a/.buildbot/tox-focal/Dockerfile
+++ b/.buildbot/tox-focal/Dockerfile
@@ -8,7 +8,7 @@ RUN apt-get install -yq --no-install-suggests --no-install-recommends \
     software-properties-common build-essential libcap-dev libffi-dev \
     libssl-dev python-all-dev python-setuptools \
     python3-dev python3-pip python3.9 python3.9-dev python3.9-venv \
-    language-pack-en qt5dxcb-plugin tor xvfb
+    language-pack-en qt5dxcb-plugin tor xvfb python3-six
 
 RUN python3.9 -m pip install --upgrade pip tox virtualenv
 
diff --git a/requirements.txt b/requirements.txt
index c787d2dd..3eb8ba22 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,5 +4,4 @@ pycryptodome
 PyQt5;python_version>="3.7" and platform_machine=="x86_64"
 mock;python_version<="2.7"
 python_prctl;platform_system=="Linux"
-six
 xvfbwrapper;platform_system=="Linux"