diff --git a/.github/workflows/pyinstaller.yml b/.github/workflows/pyinstaller.yml
index 83d3a73b4..0f9a02a64 100644
--- a/.github/workflows/pyinstaller.yml
+++ b/.github/workflows/pyinstaller.yml
@@ -32,10 +32,12 @@ jobs:
         python-version: '3.x'
         architecture: 'x64'
 
+    # curl -sSL https://bootstrap.pypa.io/get-pip.py -o get-pip.py
+    # python3 get-pip.py "pip<20"
+    # => fails with https://github.com/pypa/setuptools/issues/3044
     - name: Install Python package dependencies
       run: |
-        curl -sSL https://bootstrap.pypa.io/get-pip.py -o get-pip.py
-        python3 get-pip.py "pip<20"
+        pip3 -U pip
         pip3 show pip
         pip3 install -r requirements-dev.txt
 
diff --git a/docker/Makefile b/docker/Makefile
index 2979d367c..f5d2da1d6 100644
--- a/docker/Makefile
+++ b/docker/Makefile
@@ -40,6 +40,10 @@ clean_wheels:
 	rm -rf ./.wheels
 	mkdir -p ./.wheels/
 
+clean_docker:
+	-docker images | grep "crossbario/autobahn-python" | awk '{print $1}' | xargs docker rmi
+
+
 download_wheels:
 	mkdir -p ./.wheels/
 	rm -f ./.wheels/*.whl
@@ -63,12 +67,28 @@ docker_stop_rm:
 	-docker rm $(docker ps -a -q -f)
 
 
+show:
+	@echo
+	@echo
+	@echo "autobahn build configuration -------------------------------------------------------------------------------------------"
+	@echo
+	@echo "  AUTOBAHN_BUILD_DATE     = ${AUTOBAHN_BUILD_DATE}"
+	@echo "  AUTOBAHN_BUILD_ID       = ${AUTOBAHN_BUILD_ID}"
+	@echo "  AUTOBAHN_VCS_REF        = ${AUTOBAHN_VCS_REF}"
+	@echo "  AUTOBAHN_VERSION        = ${AUTOBAHN_VERSION}"
+	@echo ""
+	@echo "  XBRNETWORK_EXE_FILENAME = ${XBRNETWORK_EXE_FILENAME}"
+	@echo
+
+
 build: build_cpy build_pypy
 
 test: test_cpy test_pypy
 
 publish: publish_cpy publish_pypy
 
+list: list_cpy list_pypy
+
 
 build_amd64: build_cpy_amd64 build_pypy_amd64
 
@@ -76,6 +96,8 @@ test_amd64: test_cpy_amd64 test_pypy_amd64
 
 publish_amd64: publish_cpy_amd64 publish_pypy_amd64
 
+list_amd64: list_cpy_amd64 list_pypy_amd64
+
 
 build_arm64v8: build_cpy_arm64v8 build_pypy_arm64v8
 
@@ -83,6 +105,8 @@ test_arm64v8: test_cpy_arm64v8 test_pypy_arm64v8
 
 publish_arm64v8: publish_cpy_arm64v8 publish_pypy_arm64v8
 
+list_arm64v8: list_cpy_arm64v8 list_pypy_arm64v8
+
 
 build_cpy: build_cpy_amd64 build_cpy_arm64v8
 
@@ -90,6 +114,8 @@ test_cpy: test_cpy_amd64 test_cpy_arm64v8
 
 publish_cpy: publish_cpy_amd64 publish_cpy_arm64v8
 
+list_cpy: list_cpy_amd64 list_cpy_arm64v8
+
 
 build_pypy: build_pypy_amd64 build_pypy_arm64v8
 
@@ -97,6 +123,8 @@ test_pypy: test_pypy_amd64 test_pypy_arm64v8
 
 publish_pypy: publish_pypy_amd64 publish_pypy_arm64v8
 
+list_pypy: list_pypy_amd64 list_pypy_arm64v8
+
 
 build_cpy_amd64:
 	docker build \
@@ -119,6 +147,17 @@ publish_cpy_amd64:
 	docker push crossbario/autobahn-python:cpy-amd64-${AUTOBAHN_VERSION}
 	docker push crossbario/autobahn-python:cpy-amd64-${AUTOBAHN_VERSION}-${AUTOBAHN_BUILD_ID}
 
+list_cpy_amd64:
+	@echo
+	@echo "autobahn-python:cpy-amd64 ----------------------------------------------------------------------------------------------"
+	@echo
+	@docker inspect --format='{{index .RepoDigests 0}}' crossbario/autobahn-python:cpy-amd64-${AUTOBAHN_VERSION}-${AUTOBAHN_BUILD_ID}
+	@echo
+	@docker images crossbario/autobahn-python:cpy-amd64
+	@docker images crossbario/autobahn-python:cpy-amd64-${AUTOBAHN_VERSION}
+	@docker images crossbario/autobahn-python:cpy-amd64-${AUTOBAHN_VERSION}-${AUTOBAHN_BUILD_ID}
+	@docker images `docker inspect --format='{{index .RepoDigests 0}}' crossbario/autobahn-python:cpy-amd64-${AUTOBAHN_VERSION}-${AUTOBAHN_BUILD_ID}`
+
 
 build_cpy_arm64v8:
 	docker build \
@@ -141,6 +180,18 @@ publish_cpy_arm64v8:
 	docker push crossbario/autobahn-python:cpy-arm64v8-${AUTOBAHN_VERSION}
 	docker push crossbario/autobahn-python:cpy-arm64v8-${AUTOBAHN_VERSION}-${AUTOBAHN_BUILD_ID}
 
+list_cpy_arm64v8:
+	@echo
+	@echo
+	@echo "autobahn-python:cpy-arm64v8 --------------------------------------------------------------------------------------------"
+	@echo
+	@docker inspect --format='{{index .RepoDigests 0}}' crossbario/autobahn-python:cpy-arm64v8-${AUTOBAHN_VERSION}-${AUTOBAHN_BUILD_ID}
+	@echo
+	@docker images crossbario/autobahn-python:cpy-arm64v8
+	@docker images crossbario/autobahn-python:cpy-arm64v8-${AUTOBAHN_VERSION}
+	@docker images crossbario/autobahn-python:cpy-arm64v8-${AUTOBAHN_VERSION}-${AUTOBAHN_BUILD_ID}
+	@docker images `docker inspect --format='{{index .RepoDigests 0}}' crossbario/autobahn-python:cpy-arm64v8-${AUTOBAHN_VERSION}-${AUTOBAHN_BUILD_ID}`
+
 
 build_pypy_amd64:
 	docker build \
@@ -163,6 +214,18 @@ publish_pypy_amd64:
 	docker push crossbario/autobahn-python:pypy-amd64-${AUTOBAHN_VERSION}
 	docker push crossbario/autobahn-python:pypy-amd64-${AUTOBAHN_VERSION}-${AUTOBAHN_BUILD_ID}
 
+list_pypy_amd64:
+	@echo
+	@echo
+	@echo "autobahn-python:pypy-amd64 --------------------------------------------------------------------------------------------"
+	@echo
+	@docker inspect --format='{{index .RepoDigests 0}}' crossbario/autobahn-python:pypy-amd64-${AUTOBAHN_VERSION}-${AUTOBAHN_BUILD_ID}
+	@echo
+	@docker images crossbario/autobahn-python:pypy-amd64
+	@docker images crossbario/autobahn-python:pypy-amd64-${AUTOBAHN_VERSION}
+	@docker images crossbario/autobahn-python:pypy-amd64-${AUTOBAHN_VERSION}-${AUTOBAHN_BUILD_ID}
+	@docker images `docker inspect --format='{{index .RepoDigests 0}}' crossbario/autobahn-python:pypy-amd64-${AUTOBAHN_VERSION}-${AUTOBAHN_BUILD_ID}`
+
 
 build_pypy_arm64v8:
 	docker build \
@@ -185,6 +248,17 @@ publish_pypy_arm64v8:
 	docker push crossbario/autobahn-python:pypy-arm64v8-${AUTOBAHN_VERSION}
 	docker push crossbario/autobahn-python:pypy-arm64v8-${AUTOBAHN_VERSION}-${AUTOBAHN_BUILD_ID}
 
+list_pypy_arm64v8:
+	@echo
+	@echo
+	@echo "autobahn-python:pypy-arm64v8 ------------------------------------------------------------------------------------------"
+	@echo
+	@docker inspect --format='{{index .RepoDigests 0}}' crossbario/autobahn-python:pypy-arm64v8-${AUTOBAHN_VERSION}-${AUTOBAHN_BUILD_ID}
+	@echo
+	@docker images crossbario/autobahn-python:pypy-arm64v8
+	@docker images crossbario/autobahn-python:pypy-arm64v8-${AUTOBAHN_VERSION}
+	@docker images crossbario/autobahn-python:pypy-arm64v8-${AUTOBAHN_VERSION}-${AUTOBAHN_BUILD_ID}
+	@docker images `docker inspect --format='{{index .RepoDigests 0}}' crossbario/autobahn-python:pypy-arm64v8-${AUTOBAHN_VERSION}-${AUTOBAHN_BUILD_ID}`
 
 # Docker multi-arch manifest
 #
diff --git a/docker/README.md b/docker/README.md
index ab8936d9f..ca7472924 100644
--- a/docker/README.md
+++ b/docker/README.md
@@ -75,3 +75,18 @@ make build
 make test
 make publish
 ```
+
+
+## Checking built images
+
+To show the Docker image hashes and tags:
+
+```
+clear && make show list
+```
+
+To test the Docker images and print version infos:
+
+```
+clear && make test
+```
diff --git a/pyinstaller/xbrnetwork.spec b/pyinstaller/xbrnetwork.spec
index b1cb3f97a..030041b87 100644
--- a/pyinstaller/xbrnetwork.spec
+++ b/pyinstaller/xbrnetwork.spec
@@ -1,14 +1,16 @@
 # -*- mode: python ; coding: utf-8 -*-
 
+
 block_cipher = None
 
 
 a = Analysis(['../autobahn/xbr/_cli.py'],
-             pathex=['/home/oberstet/scm/crossbario/autobahn-python/pyinstaller'],
+             pathex=[],
              binaries=[],
              datas=[],
              hiddenimports=[],
              hookspath=['/home/oberstet/scm/crossbario/autobahn-python/pyinstaller'],
+             hooksconfig={},
              runtime_hooks=[],
              excludes=[],
              win_no_prefer_redirects=False,
@@ -17,11 +19,12 @@ a = Analysis(['../autobahn/xbr/_cli.py'],
              noarchive=False)
 pyz = PYZ(a.pure, a.zipped_data,
              cipher=block_cipher)
+
 exe = EXE(pyz,
           a.scripts,
           a.binaries,
           a.zipfiles,
-          a.datas,
+          a.datas,  
           [],
           name='xbrnetwork',
           debug=False,
@@ -30,4 +33,8 @@ exe = EXE(pyz,
           upx=True,
           upx_exclude=[],
           runtime_tmpdir=None,
-          console=True )
+          console=True,
+          disable_windowed_traceback=False,
+          target_arch=None,
+          codesign_identity=None,
+          entitlements_file=None )
diff --git a/tox.ini b/tox.ini
index 0b0338e98..1ca4a0f4a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -209,7 +209,8 @@ passenv =
     AUTOBAHN_VERSION
     XBRNETWORK_EXE_FILENAME
 deps =
-    pyinstaller==4.2
+    pip
+    pyinstaller==4.8
 commands =
     echo "Building with AUTOBAHN_BUILD_DATE={env:AUTOBAHN_BUILD_DATE}"
     echo "Building with AUTOBAHN_BUILD_ID={env:AUTOBAHN_BUILD_ID}"
@@ -218,8 +219,9 @@ commands =
     echo "Building with XBRNETWORK_EXE_FILENAME={env:XBRNETWORK_EXE_FILENAME}"
 
     # Install pip v19.3.1 (yes, absolutely, we do not want the "new resolver" shit)
-    curl -sSL -o get-pip.py https://bootstrap.pypa.io/get-pip.py
-    python get-pip.py "pip<20"
+    # curl -sSL -o get-pip.py https://bootstrap.pypa.io/get-pip.py
+    # python get-pip.py   # fails with https://github.com/pypa/setuptools/issues/3044
+    # python get-pip.py "pip<20"
     pip show pip
 
     # Install development dependencies