diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index f1dbde1..341af5d 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.0.90
+current_version = 0.0.91
 tag = False
 parse = (?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)(\-(?P<release>[a-z]+)(?P<build>\d+))?
 serialize = 
diff --git a/langkit/core/workflow.py b/langkit/core/workflow.py
index a6463dc..22f007c 100644
--- a/langkit/core/workflow.py
+++ b/langkit/core/workflow.py
@@ -126,7 +126,7 @@ def init(self) -> None:
             if not set(targets).issubset(metric_names):
                 raise ValueError(
                     f"Validator {validator} has target metric names ({targets}) but this workflow is "
-                    "only generating metrics for  these: {metric_names}"
+                    f"only generating metrics for these: {metric_names}"
                 )
 
     def _condense_metric_results(self, metric_results: Dict[str, SingleMetricResult]) -> pd.DataFrame:
diff --git a/pyproject.toml b/pyproject.toml
index 932aff7..236f01e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "langkit"
-version = "0.0.90"
+version = "0.0.91"
 description = "A language toolkit for monitoring LLM interactions"
 authors = ["WhyLabs.ai <langkit@whylabs.ai>"]
 homepage = "https://docs.whylabs.ai/docs/large-language-model-monitoring"