diff --git a/Cargo.lock b/Cargo.lock
index f51c6652..57be8aaf 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1019,7 +1019,6 @@ dependencies = [
  "opentelemetry-http",
  "opentelemetry-otlp",
  "opentelemetry-semantic-conventions",
- "opentelemetry_api",
  "opentelemetry_sdk 0.22.1",
  "prometheus",
  "reqwest",
diff --git a/README.md b/README.md
index 0571fbb1..859270cf 100644
--- a/README.md
+++ b/README.md
@@ -73,9 +73,11 @@ of requests across services.
 To enable tracing you must:
 
 - use the SDK option `--otlp-endpoint` e.g. `http://localhost:4317`,
-- set the SDK environment variable `OTLP_ENDPOINT`, or
+- set the SDK environment variable `OTEL_EXPORTER_OTLP_ENDPOINT`, or
 - set the `tracing` environment variable `OTEL_EXPORTER_OTLP_TRACES_ENDPOINT`.
 
+The exporter uses gRPC protocol by default. To use HTTP protocol you must set `OTEL_EXPORTER_OTLP_PROTOCOL=http/protobuf`.
+
 For additional service information you can:
 
 - Set `OTEL_SERVICE_NAME` e.g. `ndc_hub_example`
diff --git a/rust-connector-sdk/Cargo.toml b/rust-connector-sdk/Cargo.toml
index 12643943..ce66c26b 100644
--- a/rust-connector-sdk/Cargo.toml
+++ b/rust-connector-sdk/Cargo.toml
@@ -31,7 +31,6 @@ opentelemetry = { version = "^0.22", default-features = false }
 opentelemetry-http = "0.11.0"
 opentelemetry-otlp = { version = "^0.15.0", features = ["reqwest-client", "gzip-tonic", "tls", "tls-roots", "http-proto"] }
 opentelemetry-semantic-conventions = "^0.14.0"
-opentelemetry_api = "^0.20.0"
 opentelemetry_sdk = { version = "^0.22.1", features = ["rt-tokio"] }
 prometheus = "^0.13.3"
 reqwest = "^0.11.22"