diff --git a/pyproject.toml b/pyproject.toml
index e4b994b09..8c2bfc4f9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,7 +26,7 @@ requires = [
     "pyarrow >= 0.15",
     "cffi >= 1.12.2",
     "binpickle >= 0.3.2",
-    "csr == 0.2.*",
+    "csr >=0.2,<0.3",
 ]
 
 [tool.flit.metadata.requires-extra]