diff --git a/.github/workflows/codegen-ci.yml b/.github/workflows/codegen-ci.yml
index f13503537..14085f995 100644
--- a/.github/workflows/codegen-ci.yml
+++ b/.github/workflows/codegen-ci.yml
@@ -54,9 +54,9 @@ jobs:
         # TODO: can we cache some layers of the image for faster download?
         # we probably don't want to cache the final image for IP security...
         run: |
-          docker pull --quiet us-west1-docker.pkg.dev/cloud-looker-sdk-codegen-cicd/looker/21_18
+          docker pull --quiet us-west1-docker.pkg.dev/cloud-looker-sdk-codegen-cicd/looker/21_20
           # set $LOOKER_OPTS to --no-ssl if we want to turn off ssl
-          docker run --name looker-sdk-codegen-ci -d -p 10000:9999 -p 20000:19999 us-west1-docker.pkg.dev/cloud-looker-sdk-codegen-cicd/looker/21_18
+          docker run --name looker-sdk-codegen-ci -d -p 10000:9999 -p 20000:19999 us-west1-docker.pkg.dev/cloud-looker-sdk-codegen-cicd/looker/21_20
           docker logs -f looker-sdk-codegen-ci --until=30s &
 
       - uses: actions/setup-node@v1
diff --git a/.github/workflows/lerna-publish.yml b/.github/workflows/lerna-publish.yml
index dab726b92..1a55ed264 100644
--- a/.github/workflows/lerna-publish.yml
+++ b/.github/workflows/lerna-publish.yml
@@ -42,8 +42,8 @@ jobs:
 
       - name: Pull and run Looker docker image
         run: |
-          docker pull --quiet us-west1-docker.pkg.dev/cloud-looker-sdk-codegen-cicd/looker/21_18
-          docker run --name looker-sdk-codegen-ci -d -p 10000:9999 -p 20000:19999 us-west1-docker.pkg.dev/cloud-looker-sdk-codegen-cicd/looker/21_18
+          docker pull --quiet us-west1-docker.pkg.dev/cloud-looker-sdk-codegen-cicd/looker/21_20
+          docker run --name looker-sdk-codegen-ci -d -p 10000:9999 -p 20000:19999 us-west1-docker.pkg.dev/cloud-looker-sdk-codegen-cicd/looker/21_20
           docker logs -f looker-sdk-codegen-ci --until=30s &
 
       - uses: actions/setup-node@v2
diff --git a/.github/workflows/python-ci.yml b/.github/workflows/python-ci.yml
index f1b1c1837..235b1e17a 100644
--- a/.github/workflows/python-ci.yml
+++ b/.github/workflows/python-ci.yml
@@ -101,6 +101,7 @@ jobs:
           - '21_12'
           - '21_16'
           - '21_18'
+          - '21_20'
           # TODO uncomment `include:` when either macos or windows works to satisfaction.
           #include:
           # TODO: macos matrix leg is functional but it takes ~20 minutes (compared
diff --git a/.github/workflows/tssdk-ci.yml b/.github/workflows/tssdk-ci.yml
index b71912508..d537294c8 100644
--- a/.github/workflows/tssdk-ci.yml
+++ b/.github/workflows/tssdk-ci.yml
@@ -104,6 +104,7 @@ jobs:
           - '21_12'
           - '21_16'
           - '21_18'
+          - '21_20'
 
     steps:
       - name: Repo Checkout