diff --git a/README.md b/README.md
index 7aef87d..f15c0ce 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ You can also set credentials with environment variables:
 ```bash
 export LANGFUSE_PUBLIC_KEY="pk-lf-..."
 export LANGFUSE_SECRET_KEY="sk-lf-..."
-export LANGFUSE_BASEURL="https://cloud.langfuse.com"
+export LANGFUSE_BASE_URL="https://cloud.langfuse.com"
 export LANGFUSE_ENVIRONMENT="development"
 export LANGFUSE_USER_ID="your-user-id"
 ```
diff --git a/src/index.ts b/src/index.ts
index d840940..1f57922 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -100,7 +100,8 @@ const loadLangfuseCredentials = Effect.gen(function* () {
     return {
       publicKey,
       secretKey,
-      baseUrl: process.env.LANGFUSE_BASEURL,
+      // Prefer the canonical name while retaining the legacy name for semver compatibility.
+      baseUrl: process.env.LANGFUSE_BASE_URL ?? process.env.LANGFUSE_BASEURL,
       environment: process.env.LANGFUSE_ENVIRONMENT,
       userId: process.env.LANGFUSE_USER_ID,
     } satisfies LangfuseCredentials;
@@ -281,6 +282,8 @@ const main = Effect.gen(function* () {
 
     const baseUrl =
       credentials.baseUrl ??
+      // Prefer the canonical name while retaining the legacy name for semver compatibility.
+      process.env.LANGFUSE_BASE_URL ??
       process.env.LANGFUSE_BASEURL ??
       "https://cloud.langfuse.com";