diff --git a/.changeset/astro-nanostores-update.md b/.changeset/astro-nanostores-update.md
new file mode 100644
index 00000000000..7f0626acf0a
--- /dev/null
+++ b/.changeset/astro-nanostores-update.md
@@ -0,0 +1,5 @@
+---
+'@clerk/astro': patch
+---
+
+Update the `nanostores` dependency to 1.5.1.
diff --git a/packages/astro/package.json b/packages/astro/package.json
index 497f85886a2..d9be4c688dc 100644
--- a/packages/astro/package.json
+++ b/packages/astro/package.json
@@ -93,7 +93,7 @@
     "@clerk/backend": "workspace:^",
     "@clerk/shared": "workspace:^",
     "nanoid": "5.1.16",
-    "nanostores": "1.0.1"
+    "nanostores": "1.5.1"
   },
   "devDependencies": {
     "@clerk/ui": "workspace:^",
diff --git a/packages/astro/src/stores/internal.ts b/packages/astro/src/stores/internal.ts
index 383cf38e2cc..14e0f869ae6 100644
--- a/packages/astro/src/stores/internal.ts
+++ b/packages/astro/src/stores/internal.ts
@@ -22,7 +22,7 @@ export const $csrState = map<{
   organization: undefined,
 });
 
-export const $initialState = map<InitialState>();
+export const $initialState = map<InitialState>({} as InitialState);
 
 // Use atom instead of `map` to prohibit key changes and allow only replacing the whole object
 export const $clerk = atom<Clerk | null>(null);
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 4e5df091131..e495a319f67 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -367,8 +367,8 @@ importers:
         specifier: 5.1.16
         version: 5.1.16
       nanostores:
-        specifier: 1.0.1
-        version: 1.0.1
+        specifier: 1.5.1
+        version: 1.5.1
     devDependencies:
       '@clerk/ui':
         specifier: workspace:^
@@ -11817,8 +11817,8 @@ packages:
     engines: {node: ^18 || >=20}
     hasBin: true
 
-  nanostores@1.0.1:
-    resolution: {integrity: sha512-kNZ9xnoJYKg/AfxjrVL4SS0fKX++4awQReGqWnwTRHxeHGZ1FJFVgTqr/eMrNQdp0Tz7M7tG/TDaX8QfHDwVCw==}
+  nanostores@1.5.1:
+    resolution: {integrity: sha512-DNIX+HyFpo14fKGe0NsX9/aPzdKGiSZwX5xEMpDwQrDdo2iTiUYunOCCQLYwJrziKVe8ZOtVvcv0dEVI8lMx2g==}
     engines: {node: ^20.0.0 || >=22.0.0}
 
   nanotar@0.3.0:
@@ -28545,7 +28545,7 @@ snapshots:
 
   nanoid@5.1.16: {}
 
-  nanostores@1.0.1: {}
+  nanostores@1.5.1: {}
 
   nanotar@0.3.0: {}