diff --git a/dev-requirements.txt b/dev-requirements.txt
index f54c2a5..1d1fd29 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -87,7 +87,7 @@ opentelemetry-semantic-conventions==0.56b0
     #   elastic-opentelemetry (pyproject.toml)
     #   opentelemetry-instrumentation
     #   opentelemetry-sdk
-oteltest==0.24.0
+oteltest==0.43.0
     # via elastic-opentelemetry (pyproject.toml)
 packaging==25.0
     # via
diff --git a/pyproject.toml b/pyproject.toml
index baf3f7f..72971cc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,7 +41,7 @@ dependencies = [
 ]
 
 [project.optional-dependencies]
-dev = ["pytest", "pip-tools", "oteltest==0.24.0", "leb128", "pytest-vcr ; python_version > '3.9'"]
+dev = ["pytest", "pip-tools", "oteltest==0.43.0", "leb128", "pytest-vcr ; python_version > '3.9'"]
 
 [project.entry-points.opentelemetry_configurator]
 configurator = "elasticotel.distro:ElasticOpenTelemetryConfigurator"