diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index ac8139d..590c071 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -23,76 +23,78 @@ on:
         description: "Which docker tag to push to"
         required: false
         type: string
+  schedule: # run with "build_main: true" weekly on Mon at 1:01
+    - cron: '1 1 * * 1'
 
 jobs:
   curl:
     uses: ./.github/workflows/curl.yml
     with:
-      build_main: ${{ inputs.build_main == 'true' }}
+      build_main: ${{ !contains(inputs.build_main == 'true', 'false') }}
       release_tag: ${{ inputs.release_tag }}
 
   h2load:
     uses: ./.github/workflows/h2load.yml
     with:
-      build_main: ${{ inputs.build_main == 'true' }}
+      build_main: ${{ !contains(inputs.build_main == 'true', 'false') }}
       release_tag: ${{ inputs.release_tag }}
 
   haproxy:
     uses: ./.github/workflows/haproxy.yml
     with:
-      build_main: ${{ inputs.build_main == 'true' }}
+      build_main: ${{ !contains(inputs.build_main == 'true', 'false') }}
       release_tag: ${{ inputs.release_tag }}
 
   httpd:
     uses: ./.github/workflows/httpd.yml
     with:
-      build_main: ${{ inputs.build_main == 'true' }}
+      build_main: ${{ !contains(inputs.build_main == 'true', 'false') }}
       release_tag: ${{ inputs.release_tag }}
 
   locust:
     uses: ./.github/workflows/locust.yml
     with:
-      build_main: ${{ inputs.build_main == 'true' }}
+      build_main: ${{ !contains(inputs.build_main == 'true', 'false') }}
       release_tag: ${{ inputs.release_tag }}
 
   mosquitto:
     uses: ./.github/workflows/mosquitto.yml
     with:
-      build_main: ${{ inputs.build_main == 'true' }}
+      build_main: ${{ !contains(inputs.build_main == 'true', 'false') }}
       release_tag: ${{ inputs.release_tag }}
 
   nginx:
     uses: ./.github/workflows/nginx.yml
     with:
-      build_main: ${{ inputs.build_main == 'true' }}
+      build_main: ${{ !contains(inputs.build_main == 'true', 'false') }}
       release_tag: ${{ inputs.release_tag }}
 
   ngtcp2:
     uses: ./.github/workflows/ngtcp2.yml
     with:
-      build_main: ${{ inputs.build_main == 'true' }}
+      build_main: ${{ !contains(inputs.build_main == 'true', 'false') }}
       release_tag: ${{ inputs.release_tag }}
 
   openssh:
     uses: ./.github/workflows/openssh.yml
     with:
-      build_main: ${{ inputs.build_main == 'true' }}
+      build_main: ${{ !contains(inputs.build_main == 'true', 'false') }}
       release_tag: ${{ inputs.release_tag }}
 
   openssl3:
     uses: ./.github/workflows/openssl3.yml
     with:
-      build_main: ${{ inputs.build_main == 'true' }}
+      build_main: ${{ !contains(inputs.build_main == 'true', 'false') }}
       release_tag: ${{ inputs.release_tag }}
 
   openvpn:
     uses: ./.github/workflows/openvpn.yml
     with:
-      build_main: ${{ inputs.build_main == 'true' }}
+      build_main: ${{ !contains(inputs.build_main == 'true', 'false') }}
       release_tag: ${{ inputs.release_tag }}
 
   wireshark:
     uses: ./.github/workflows/wireshark.yml
     with:
-      build_main: ${{ inputs.build_main == 'true' }}
+      build_main: ${{ !contains(inputs.build_main == 'true', 'false') }}
       release_tag: ${{ inputs.release_tag }}
diff --git a/README.md b/README.md
index 0d1349a..aa812b0 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,8 @@ It should be possible to use the openssl (s_client) and curl clients with all al
 
 When updates to an integration with a Dockerfile are pushed to `main`, an updated `latest` image is pushed to DockerHub and ghcr.io with support for both x86_64 and arm64.
 
+The build and test CI is run against the latest code in liboqs and oqs-provider weekly.
+
 ## Contributing
 
 Contributions are gratefully welcomed. See our [Contributing Guide](CONTRIBUTING.md) for more details.