diff --git a/changelog.d/18878.docker b/changelog.d/18878.docker
new file mode 100644
index 0000000000..cf74f67cc8
--- /dev/null
+++ b/changelog.d/18878.docker
@@ -0,0 +1 @@
+Suppress "Applying schema" log noise bulk when `SYNAPSE_LOG_TESTING` is set.
diff --git a/docker/conf/log.config b/docker/conf/log.config
index 5772321202..6fe7db66da 100644
--- a/docker/conf/log.config
+++ b/docker/conf/log.config
@@ -77,6 +77,13 @@ loggers:
     #}
     synapse.visibility.filtered_event_debug:
         level: DEBUG
+
+    {#
+      If Synapse is under test, we don't care about seeing the "Applying schema" log
+      lines at the INFO level every time we run the tests (it's 100 lines of bulk)
+    #}
+    synapse.storage.prepare_database:
+      level: WARN
     {% endif %}
 
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