diff --git a/.github/workflows/soundness.yml b/.github/workflows/soundness.yml
index 43b0f2c7..9c5663d2 100644
--- a/.github/workflows/soundness.yml
+++ b/.github/workflows/soundness.yml
@@ -22,7 +22,7 @@ on:
       api_breakage_check_container_image:
         type: string
         description: "Container image for the API breakage check job. Defaults to latest Swift Ubuntu image."
-        default: "swift:6.3-noble"
+        default: "swift:6.4-noble"
       api_breakage_check_additional_arguments:
         type: string
         description: "Additional arguments to pass directory to the `swift package diagnose-api-breaking-changes` invocation."
@@ -34,7 +34,7 @@ on:
       docs_check_container_image:
         type: string
         description: "Container image for the docs check job. Defaults to latest Swift Ubuntu image."
-        default: "swift:6.3-noble"
+        default: "swift:6.4-noble"
       docs_check_additional_arguments:
         type: string
         description: "Additional arguments that should be passed to docc"
@@ -102,7 +102,7 @@ on:
       format_check_container_image:
         type: string
         description: "Container image for the format check job. Defaults to latest Swift Ubuntu image."
-        default: "swift:6.3-noble"
+        default: "swift:6.4-noble"
       shell_check_enabled:
         type: boolean
         description: "Boolean to enable the shell check job. Defaults to true."