diff --git a/action.yml b/action.yml
index 0c6ecce..bcc62ab 100644
--- a/action.yml
+++ b/action.yml
@@ -23,7 +23,6 @@ inputs:
   source-pr:
     description: The PR of `magic-nix-cache` to use. Conflicts with all other `source-*` options.
     required: false
-    default: 10
   source-revision:
     description: The revision of `nix-magic-nix-cache` to use. Conflicts with all other `source-*` options.
     required: false
diff --git a/dist/index.js b/dist/index.js
index 417c77e..5831399 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -12118,8 +12118,8 @@ const gotClient = got$1.extend({
 function getCacherUrl() {
     const runnerArch = process.env.RUNNER_ARCH;
     const runnerOs = process.env.RUNNER_OS;
-    const binarySuffix = `magic-nix-cache-${runnerArch}-${runnerOs}`;
-    const urlPrefix = `https://magic-nix-cache-priv20231208150408868500000001.s3.us-east-2.amazonaws.com`;
+    const binarySuffix = `${runnerArch}-${runnerOs}`;
+    const urlPrefix = `https://install.determinate.systems/magic-nix-cache-priv`;
     if (coreExports.getInput('source-url')) {
         return coreExports.getInput('source-url');
     }
@@ -12127,7 +12127,7 @@ function getCacherUrl() {
         return `${urlPrefix}/tag/${coreExports.getInput('source-tag')}/${binarySuffix}`;
     }
     if (coreExports.getInput('source-pr')) {
-        return `${urlPrefix}/pr_${coreExports.getInput('source-pr')}/${binarySuffix}`;
+        return `${urlPrefix}/pr/${coreExports.getInput('source-pr')}/${binarySuffix}`;
     }
     if (coreExports.getInput('source-branch')) {
         return `${urlPrefix}/branch/${coreExports.getInput('source-branch')}/${binarySuffix}`;
@@ -12140,7 +12140,7 @@ function getCacherUrl() {
 async function fetchAutoCacher() {
     const binary_url = getCacherUrl();
     coreExports.info(`Fetching the Magic Nix Cache from ${binary_url}`);
-    const { stdout } = await promisify$1(exec)(`curl "${binary_url}" | xz -d | nix-store --import`);
+    const { stdout } = await promisify$1(exec)(`curl -L "${binary_url}" | xz -d | nix-store --import`);
     const paths = stdout.split(os$2.EOL);
     // Since the export is in reverse topologically sorted order, magic-nix-cache is always the penultimate entry in the list (the empty string left by split being the last).
     const last_path = paths.at(-2);
diff --git a/src/index.ts b/src/index.ts
index 4e79825..cf2790e 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -32,9 +32,8 @@ const gotClient = got.extend({
 function getCacherUrl() : string {
   const runnerArch = process.env.RUNNER_ARCH;
   const runnerOs = process.env.RUNNER_OS;
-  const binarySuffix = `magic-nix-cache-${runnerArch}-${runnerOs}`;
-  const urlPrefix = `https://magic-nix-cache-priv20231208150408868500000001.s3.us-east-2.amazonaws.com`;
-
+  const binarySuffix = `${runnerArch}-${runnerOs}`;
+  const urlPrefix = `https://install.determinate.systems/magic-nix-cache-priv`;
   if (core.getInput('source-url')) {
     return core.getInput('source-url');
   }
@@ -44,7 +43,7 @@ function getCacherUrl() : string {
   }
 
   if (core.getInput('source-pr')) {
-    return `${urlPrefix}/pr_${core.getInput('source-pr')}/${binarySuffix}`;
+    return `${urlPrefix}/pr/${core.getInput('source-pr')}/${binarySuffix}`;
   }
 
   if (core.getInput('source-branch')) {
@@ -62,7 +61,7 @@ async function fetchAutoCacher() {
   const binary_url = getCacherUrl();
   core.info(`Fetching the Magic Nix Cache from ${binary_url}`);
 
-  const { stdout } = await promisify(exec)(`curl "${binary_url}" | xz -d | nix-store --import`);
+  const { stdout } = await promisify(exec)(`curl -L "${binary_url}" | xz -d | nix-store --import`);
 
   const paths = stdout.split(os.EOL);