diff --git a/.ci/test/static/run b/.ci/test/static/run
index 5383dde0..c09eeb3c 100755
--- a/.ci/test/static/run
+++ b/.ci/test/static/run
@@ -8,7 +8,9 @@ set -eo pipefail
 #
 
 # Run composer install to get the vendor directory
-composer install --no-ansi --no-interaction --optimize-autoloader --no-progress
+# ext-redis is ignored because the CI image doesn't ship it; Object Cache Pro
+# requires it, but nothing is executed during static analysis.
+composer install --ignore-platform-req=ext-redis --no-ansi --no-interaction --optimize-autoloader --no-progress
 
 # Delete and reset the web directory
 # This is necessary so that third-party
diff --git a/.circleci/config.yml b/.circleci/config.yml
index 7e05d9e0..8ef4b813 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -234,7 +234,11 @@ workflows:
   build_deploy_and_test:
     jobs:
       - configure_env_vars
-      - static_tests
+      # static_tests runs composer install, which downloads premium plugins
+      # from their registries, so it needs the same credentials as build_php.
+      - static_tests:
+          context:
+            - plugin_keys
       - build_yarn
       - build_php:
           context: