diff --git a/requirements-dev.in b/requirements-dev.in
index 891eb891..387bcf18 100644
--- a/requirements-dev.in
+++ b/requirements-dev.in
@@ -1,3 +1,4 @@
+attrs==23.1.0
 pylint
 pytest
 pytest-mock
@@ -8,4 +9,4 @@ flake8
 pytest-mock
 coverage
 openfeature-sdk
-opentelemetry-api
+opentelemetry-api
\ No newline at end of file