diff --git a/.mina/console.toml b/.mina/console.toml
index 3f7923cf..588736e9 100644
--- a/.mina/console.toml
+++ b/.mina/console.toml
@@ -1,11 +1,11 @@
 includes = ["avilla/console"]
 raw-dependencies = [
-  "avilla-core >= 1.0.0a6",
+  "avilla-core >= 1.0.0a18",
 ]
 
 [project]
 name = "avilla-console"
-version = "1.0.0a9" # WIP for release.
+version = "1.0.0a18" # WIP for release.
 authors = [
   {name = "RF-Tar-Railt", email = "rf_tar_railt@qq.com"},
 ]
diff --git a/.mina/core.toml b/.mina/core.toml
index dbc91835..e8a57a39 100644
--- a/.mina/core.toml
+++ b/.mina/core.toml
@@ -7,7 +7,7 @@ includes = [
 
 [project]
 name = "avilla-core"
-version = "1.0.0a17"
+version = "1.0.0a18"
 authors = [
   {name = "GreyElaina", email = "GreyElaina@outlook.com"},
   {name = "BlueGlassBlock", email = "blueglassblock@outlook.com"},
diff --git a/avilla/core/builtins/resource_fetch.py b/avilla/core/builtins/resource_fetch.py
index 1fb7fe06..d14c096a 100644
--- a/avilla/core/builtins/resource_fetch.py
+++ b/avilla/core/builtins/resource_fetch.py
@@ -1,9 +1,15 @@
 from __future__ import annotations
 
-from aiohttp import ClientSession
 from avilla.core.resource import LocalFileResource, RawResource, UrlResource
 from avilla.core.ryanvk.collector.application import ApplicationCollector
 
+try:
+    from aiohttp import ClientSession
+    aio = True
+except ImportError:
+    ClientSession = None
+    aio = False
+
 from .capability import CoreCapability
 
 
@@ -16,8 +22,13 @@ async def fetch_localfile(self, resource: LocalFileResource):
     async def fetch_raw(self, resource: RawResource):
         return resource.data
 
-    @m.entity(CoreCapability.fetch, resource=UrlResource)
-    async def fetch_url(self, resource: UrlResource):
-        async with ClientSession() as session:
-            async with session.get(resource.url) as resp:
-                return await resp.read()
+    if aio:
+        @m.entity(CoreCapability.fetch, resource=UrlResource)
+        async def fetch_url(self, resource: UrlResource):
+            async with ClientSession() as session:
+                async with session.get(resource.url) as resp:
+                    return await resp.read()
+    else:
+        @m.entity(CoreCapability.fetch, resource=UrlResource)
+        async def fetch_url(self, resource: UrlResource):
+            raise NotImplementedError("aiohttp is not installed")