diff --git a/pyproject.toml b/pyproject.toml
index cc00c5b..5b0f938 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -32,7 +32,7 @@ dynamic = [
   "version",
 ]
 dependencies = [
-  "async-retriever=0.15",
+  "async-retriever==0.15",
   "cytoolz",
   "defusedxml",
   "joblib",