diff --git a/.readthedocs.yml b/.readthedocs.yml
index 518f6e5a..d9b0e1bb 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -7,8 +7,12 @@ version: 2
 sphinx:
   configuration: docs/conf.py
 
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.8"
+
 python:
-  version: 3.8
   install:
     - method: pip
       path: .
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 03d444b3..17bdd44e 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -12,7 +12,7 @@ Feedback and contributions to miniwdl are welcome, via issues and pull requests
 To set up your Linux development environment,
 
 1. `git clone --recursive` this repository or your fork thereof, and `cd` into it
-2. Install dependencies as illustrated in the [Dockerfile](https://github.com/chanzuckerberg/miniwdl/blob/main/Dockerfile) (OS packages) and [pyproject.toml](pyproject.toml)  (PyPI dependencies).
+2. Install OS packages as illustrated in the [Dockerfile](https://github.com/chanzuckerberg/miniwdl/blob/main/Dockerfile) (OS packages) and PyPI dependencies with `pip3 install '.[dev]'`
 3. Invoking user must have [permission to control Docker](https://docs.docker.com/install/linux/linux-postinstall/#manage-docker-as-a-non-root-user)
 4. Try `python3 -m WDL run_self_test` to test the configuration
 
diff --git a/WDL/runtime/config_templates/default.cfg b/WDL/runtime/config_templates/default.cfg
index f7273bcc..9638d270 100644
--- a/WDL/runtime/config_templates/default.cfg
+++ b/WDL/runtime/config_templates/default.cfg
@@ -204,7 +204,7 @@ flock = true
 
 [download_aria2c]
 # see: https://github.com/chanzuckerberg/miniwdl/tree/main/tools_image
-docker = ghcr.io/miniwdl-ext/miniwdl-tools:Id_sha256_dd1b3a8fbeda2966f6f1819f2166dc7123b4e6bba6d52f4ae2319daba1eadae3
+docker = ghcr.io/miniwdl-ext/miniwdl-tools:Id_sha256_75c43484d36b76976f0f8e5a86a30ef1f88fdd37c77019be67b1459133a64dc1
 
 
 [download_awscli]
@@ -217,7 +217,7 @@ docker = ghcr.io/miniwdl-ext/miniwdl-tools:Id_sha256_dd1b3a8fbeda2966f6f1819f216
 # Failing all of the above, public S3 URIs can always be used.
 host_credentials = false
 # see: https://github.com/chanzuckerberg/miniwdl/tree/main/tools_image
-docker = ghcr.io/miniwdl-ext/miniwdl-tools:Id_sha256_dd1b3a8fbeda2966f6f1819f2166dc7123b4e6bba6d52f4ae2319daba1eadae3
+docker = ghcr.io/miniwdl-ext/miniwdl-tools:Id_sha256_75c43484d36b76976f0f8e5a86a30ef1f88fdd37c77019be67b1459133a64dc1
 
 
 [download_gsutil]