diff --git a/setup.cfg b/setup.cfg
index 24d57974..c1d91c9e 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,5 @@
 [metadata]
-version = 0.6.1
+version = 0.6.2
 description = Integrating LLMs into structured NLP pipelines
 author = Explosion
 author_email = contact@explosion.ai
diff --git a/spacy_llm/models/rest/anthropic/model.py b/spacy_llm/models/rest/anthropic/model.py
index 4c2567f2..602ba14b 100644
--- a/spacy_llm/models/rest/anthropic/model.py
+++ b/spacy_llm/models/rest/anthropic/model.py
@@ -54,7 +54,7 @@ def __call__(self, prompts: Iterable[str]) -> Iterable[str]:
         headers = {
             **self._credentials,
             "model": self._name,
-            "anthropic_version": self._config.get("anthropic_version", "2023-06-01"),
+            "anthropic-version": self._config.get("anthropic-version", "2023-06-01"),
             "Content-Type": "application/json",
         }