diff --git a/pyproject.toml b/pyproject.toml
index af1f004b8ed..f3deca7b982 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -44,7 +44,7 @@ generate-setup-file = false
 [tool.poetry.dependencies]
 python = "^3.7"
 
-poetry-core = "^1.1.0b3"
+poetry-core = "1.1.0b3"
 poetry-plugin-export = "^1.0.5"
 cachecontrol = { version = "^0.12.9", extras = ["filecache"] }
 cachy = "^0.3.0"