diff --git a/src/pyodide/internal/python.ts b/src/pyodide/internal/python.ts
index 37d1372600c..a46f04c7062 100644
--- a/src/pyodide/internal/python.ts
+++ b/src/pyodide/internal/python.ts
@@ -4,7 +4,8 @@ import {
   TRANSITIVE_REQUIREMENTS,
   SITE_PACKAGES,
   adjustSysPath,
-  mountLib,
+  mountSitePackages,
+  mountWorkerFiles,
 } from 'pyodide-internal:setupPackages';
 import { reportError } from 'pyodide-internal:util';
 import {
@@ -201,7 +202,7 @@ async function instantiateEmscriptenModule(
  */
 async function prepareWasmLinearMemory(Module: Module): Promise<void> {
   // Note: if we are restoring from a snapshot, runtime is not initialized yet.
-  mountLib(Module, SITE_PACKAGES.rootInfo);
+  mountSitePackages(Module, SITE_PACKAGES.rootInfo);
   entropyMountFiles(Module);
   if (SHOULD_RESTORE_SNAPSHOT) {
     restoreSnapshot(Module);
@@ -229,6 +230,9 @@ export async function loadPyodide(
     prepareWasmLinearMemory(Module)
   );
   maybeSetupSnapshotUpload(Module);
+  // Mount worker files after doing snapshot upload so we ensure that data from the files is never
+  // present in snapshot memory.
+  mountWorkerFiles(Module);
 
   // Finish setting up Pyodide's ffi so we can use the nice Python interface
   await enterJaegerSpan('finalize_bootstrap', Module.API.finalizeBootstrap);
diff --git a/src/pyodide/internal/setupPackages.ts b/src/pyodide/internal/setupPackages.ts
index fe386f714a4..539b5e77661 100644
--- a/src/pyodide/internal/setupPackages.ts
+++ b/src/pyodide/internal/setupPackages.ts
@@ -189,18 +189,21 @@ export function getSitePackagesPath(Module: Module): string {
  * details, so even though we want these directories to be on sys.path, we
  * handle that separately in adjustSysPath.
  */
-export function mountLib(Module: Module, info: TarFSInfo): void {
+export function mountSitePackages(Module: Module, info: TarFSInfo): void {
   const tarFS = createTarFS(Module);
-  const mdFS = createMetadataFS(Module);
   const site_packages = getSitePackagesPath(Module);
   Module.FS.mkdirTree(site_packages);
-  Module.FS.mkdirTree('/session/metadata');
   if (!LOAD_WHEELS_FROM_R2 && !LOAD_WHEELS_FROM_ARTIFACT_BUNDLER) {
     // if we are not loading additional wheels, then we're done
     // with site-packages and we can mount it here. Otherwise, we must mount it in
     // loadPackages().
     Module.FS.mount(tarFS, { info }, site_packages);
   }
+}
+
+export function mountWorkerFiles(Module: Module) {
+  Module.FS.mkdirTree('/session/metadata');
+  const mdFS = createMetadataFS(Module);
   Module.FS.mount(mdFS, {}, '/session/metadata');
 }
 
diff --git a/src/workerd/io/compatibility-date.capnp b/src/workerd/io/compatibility-date.capnp
index ee4f637976f..4e75aadb6e0 100644
--- a/src/workerd/io/compatibility-date.capnp
+++ b/src/workerd/io/compatibility-date.capnp
@@ -424,7 +424,7 @@ struct CompatibilityFlags @0x8f8c1b68151b6cef {
   pythonWorkers @43 :Bool
       $compatEnableFlag("python_workers")
       $pythonSnapshotRelease(pyodide = "0.26.0a2", pyodideRevision = "2024-03-01",
-          packages = "2024-03-01", backport = 0)
+          packages = "2024-03-01", backport = 1)
       $impliedByAfterDate(name = "pythonWorkersDevPyodide", date = "2000-01-01");
   # Enables Python Workers. Access to this flag is not restricted, instead bundles containing
   # Python modules are restricted in EWC.