diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..f9c159a
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,16 @@
+name: Test
+
+on: push
+
+jobs:
+  build:
+    name: Setup, Build, Publish, and Deploy
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+      
+    - name: Build
+      run: |-
+        FORCE_DOWNLOAD=y ./build 
diff --git a/Dockerfile-core b/Dockerfile-core
index 56c2c13..97f4c87 100644
--- a/Dockerfile-core
+++ b/Dockerfile-core
@@ -1,7 +1,7 @@
 FROM ubuntu:18.04
 
-ARG PIP_INSTALL="pip install --no-cache-dir --use-feature=2020-resolver"
-ARG OCRD_VERSION_MINIMUM="2.18.1"
+ARG PIP_INSTALL="pip install --no-cache-dir"
+ARG OCRD_VERSION_MINIMUM="2.21.0"
 ENV LC_ALL=C.UTF-8 LANG=C.UTF-8
 ENV PIP_DEFAULT_TIMEOUT=120
 
diff --git a/Dockerfile-dinglehopper b/Dockerfile-dinglehopper
index a95d487..8885325 100644
--- a/Dockerfile-dinglehopper
+++ b/Dockerfile-dinglehopper
@@ -1,6 +1,6 @@
 FROM my_ocrd_workflow-core
 
-ARG PIP_INSTALL="pip install --no-cache-dir --use-feature=2020-resolver"
+ARG PIP_INSTALL="pip install --no-cache-dir"
 ARG DINGLEHOPPER_COMMIT="6e47acd"
 
 
diff --git a/Dockerfile-ocrd_calamari b/Dockerfile-ocrd_calamari
index 640e94b..f94d54c 100644
--- a/Dockerfile-ocrd_calamari
+++ b/Dockerfile-ocrd_calamari
@@ -2,7 +2,7 @@ FROM my_ocrd_workflow-core-cuda10.1
 
 
 # XXX https://github.com/OCR-D/core/issues/642
-#ARG PIP_INSTALL="pip install --no-cache-dir --use-feature=2020-resolver"
+#ARG PIP_INSTALL="pip install --no-cache-dir"
 ARG PIP_INSTALL="pip install --no-cache-dir"
 ARG OCRD_CALAMARI_VERSION="1.0.0"
 
@@ -20,8 +20,7 @@ COPY data/mirror/github.com/Calamari-OCR/calamari_models/gt4histocr
 
 
 # Check pip dependencies
-# XXX https://github.com/OCR-D/core/issues/642
-#RUN pip check
+RUN pip check
 
 
 # Default command
diff --git a/Dockerfile-ocrd_calamari03 b/Dockerfile-ocrd_calamari03
index 549c4ed..6d4089b 100644
--- a/Dockerfile-ocrd_calamari03
+++ b/Dockerfile-ocrd_calamari03
@@ -1,6 +1,6 @@
 FROM my_ocrd_workflow-core
 
-ARG PIP_INSTALL="pip install --no-cache-dir --use-feature=2020-resolver"
+ARG PIP_INSTALL="pip install --no-cache-dir"
 
 
 # Build pip installable stuff
diff --git a/Dockerfile-ocrd_cis b/Dockerfile-ocrd_cis
index 9cb02bd..f846251 100644
--- a/Dockerfile-ocrd_cis
+++ b/Dockerfile-ocrd_cis
@@ -1,6 +1,6 @@
 FROM my_ocrd_workflow-core
 
-ARG PIP_INSTALL="pip install --no-cache-dir --use-feature=2020-resolver"
+ARG PIP_INSTALL="pip install --no-cache-dir"
 ARG OCRD_CIS_VERSION="0.1.5"
 
 
diff --git a/Dockerfile-ocrd_fileformat b/Dockerfile-ocrd_fileformat
index c1a2180..deff0c6 100644
--- a/Dockerfile-ocrd_fileformat
+++ b/Dockerfile-ocrd_fileformat
@@ -1,6 +1,6 @@
 FROM my_ocrd_workflow-core
 
-ARG PIP_INSTALL="pip install --no-cache-dir --use-feature=2020-resolver"
+ARG PIP_INSTALL="pip install --no-cache-dir"
 ARG OCRD_FILEFORMAT_VERSION="0.1.1"
 
 
diff --git a/Dockerfile-ocrd_olena b/Dockerfile-ocrd_olena
index 644ad4e..1f2bcd4 100644
--- a/Dockerfile-ocrd_olena
+++ b/Dockerfile-ocrd_olena
@@ -1,6 +1,6 @@
 FROM my_ocrd_workflow-core
 
-ARG PIP_INSTALL="pip install --no-cache-dir --use-feature=2020-resolver"
+ARG PIP_INSTALL="pip install --no-cache-dir"
 ARG OCRD_OLENA_VERSION="1.2.0"
 
 
diff --git a/Dockerfile-ocrd_tesserocr b/Dockerfile-ocrd_tesserocr
index 6776eff..b95ab2a 100644
--- a/Dockerfile-ocrd_tesserocr
+++ b/Dockerfile-ocrd_tesserocr
@@ -1,6 +1,6 @@
 FROM my_ocrd_workflow-core
 
-ARG PIP_INSTALL="pip install --no-cache-dir --use-feature=2020-resolver"
+ARG PIP_INSTALL="pip install --no-cache-dir"
 ARG TESSDATA_BEST_VERSION="4.0.0"
 ENV TESSDATA_PREFIX /usr/local/share/tessdata
 
diff --git a/Dockerfile-sbb_binarization b/Dockerfile-sbb_binarization
index 6ee301d..64cd158 100644
--- a/Dockerfile-sbb_binarization
+++ b/Dockerfile-sbb_binarization
@@ -1,6 +1,6 @@
 FROM my_ocrd_workflow-core
 
-ARG PIP_INSTALL="pip install --no-cache-dir --use-feature=2020-resolver"
+ARG PIP_INSTALL="pip install --no-cache-dir"
 ARG SBB_BINARIZATION_COMMIT="4d145cc"
 
 
diff --git a/Dockerfile-sbb_textline_detector b/Dockerfile-sbb_textline_detector
index d989c0a..006799f 100644
--- a/Dockerfile-sbb_textline_detector
+++ b/Dockerfile-sbb_textline_detector
@@ -1,6 +1,6 @@
 FROM my_ocrd_workflow-core-cuda10.0
 
-ARG PIP_INSTALL="pip install --no-cache-dir --use-feature=2020-resolver"
+ARG PIP_INSTALL="pip install --no-cache-dir"
 ARG SBB_TEXTLINE_DETECTOR_COMMIT="247d5f9"
 
 
diff --git a/README.md b/README.md
index 27e4cb9..b1597e3 100644
--- a/README.md
+++ b/README.md
@@ -27,13 +27,25 @@ including all dependencies in Docker.
 
 How to use
 ----------
-It's easiest to use it as pre-built containers. To run the containers on an
-example workspace:
+**Currently, due to problems with the Travis CI, we do not provide pre-built
+containers anymore.***
 
+To build the containers yourself using Docker:
+~~~
+cd ~/devel/ocrd-galley/
+./build
 ~~~
-# Update to the latest stable containers
-(cd ~/devel/ocrd-galley/; ./run-docker-hub-update)
 
+You can then install the wrappers into a Python venv:
+~~~
+cd ~/devel/ocrd-galley/wrapper
+pip install .
+~~~
+
+You may then use the script `my_ocrd_workflow` to use your self-built
+containers on an example workspace:
+
+~~~
 # Download an example workspace
 cd /tmp
 wget https://qurator-data.de/examples/actevedef_718448162.first-page.zip
@@ -41,17 +53,8 @@ unzip actevedef_718448162.first-page.zip
 
 # Run the workflow on it
 cd actevedef_718448162.first-page
-~/devel/ocrd-galley/run-docker-hub
-~~~
-
-### Build the containers yourself
-To build the containers yourself using Docker:
-~~~
-cd ~/devel/ocrd-galley/
-./build
+~/devel/ocrd-galley/my_ocrd_workflow
 ~~~
-You may then use the script `run` to use your self-built containers, analogous to
-the example above.
 
 ### Viewing results
 You may then examine the results using
@@ -83,7 +86,7 @@ The document must be specified by its PPN, for example:
 ~~~
 ~/devel/ocrd-galley/ppn2ocr PPN77164308X
 cd PPN77164308X
-~/devel/ocrd-galley/run-docker-hub -I BEST --skip-validation
+~/devel/ocrd-galley/my_ocrd_workflow -I BEST --skip-validation
 ~~~
 
 This produces a workspace directory `PPN77164308X` with the OCR results in it;
@@ -101,7 +104,7 @@ for the given images.
 ~~~
 ~/devel/ocrd-galley/ocrd-workspace-from-images 0005.png
 cd workspace-xxxxx  # output by the last command
-~/devel/ocrd-galley/run-docker-hub
+~/devel/ocrd-galley/my_ocrd_workflow
 ~~~
 
 This produces a workspace from the files and then runs the OCR workflow on it.
diff --git a/my_ocrd_workflow b/my_ocrd_workflow
index 50d2724..113c6ab 100755
--- a/my_ocrd_workflow
+++ b/my_ocrd_workflow
@@ -70,7 +70,7 @@ main() {
   do_validate
 
 
-  ocrd-calamari-recognize --overwrite -I OCR-D-SEG-LINE -O OCR-D-OCR-CALAMARI -P checkpoint "/var/lib/calamari-models/GT4HistOCR/2019-07-22T15_49+0200/*.ckpt.json" -P textequiv_level "$TEXTEQUIV_LEVEL"
+  ocrd-calamari-recognize --overwrite -I OCR-D-SEG-LINE -O OCR-D-OCR-CALAMARI -P checkpoint "/var/lib/calamari-models/GT4HistOCR/2019-12-11T11_10+0100/*.ckpt.json" -P textequiv_level "$TEXTEQUIV_LEVEL"
   ocrd-tesserocr-recognize --overwrite -I OCR-D-SEG-LINE -O OCR-D-OCR-TESS -P model "GT4HistOCR_2000000" -P textequiv_level "$TEXTEQUIV_LEVEL"
   do_validate
 
diff --git a/run-docker-hub-update b/run-docker-hub-update
deleted file mode 100755
index cc6c860..0000000
--- a/run-docker-hub-update
+++ /dev/null
@@ -1,11 +0,0 @@
-#!/bin/sh
-# Update the my_ocrd_workflow containers
-
-DOCKER_IMAGE_PREFIX=mikegerber/my_ocrd_workflow
-DOCKER_IMAGE_TAG=stable
-
-
-sub_images=`ls -1 Dockerfile-* | sed 's/Dockerfile-//'`
-for x in $sub_images; do
-  docker pull $DOCKER_IMAGE_PREFIX-$x:$DOCKER_IMAGE_TAG
-done