diff --git a/.changeset/rich-actors-flow.md b/.changeset/rich-actors-flow.md
new file mode 100644
index 00000000..e66fd667
--- /dev/null
+++ b/.changeset/rich-actors-flow.md
@@ -0,0 +1,5 @@
+---
+'@hono/sentry': patch
+---
+
+Add explicit `Toucan` return type
diff --git a/packages/sentry/src/index.ts b/packages/sentry/src/index.ts
index f6e5d771..38856a66 100644
--- a/packages/sentry/src/index.ts
+++ b/packages/sentry/src/index.ts
@@ -55,6 +55,6 @@ export const sentry = (
   }
 }
 
-export const getSentry = (c: Context) => {
+export const getSentry = (c: Context): Toucan => {
   return c.get('sentry')
 }
diff --git a/packages/sentry/tsconfig.build.json b/packages/sentry/tsconfig.build.json
index ccc2f65a..a82a1266 100644
--- a/packages/sentry/tsconfig.build.json
+++ b/packages/sentry/tsconfig.build.json
@@ -4,7 +4,8 @@
     "rootDir": "src",
     "outDir": "dist",
     "tsBuildInfoFile": "dist/tsconfig.build.tsbuildinfo",
-    "emitDeclarationOnly": false
+    "emitDeclarationOnly": false,
+    "isolatedDeclarations": true
   },
   "include": ["src/**/*.ts"],
   "exclude": ["**/*.test.ts"],