diff --git a/ceres-solver-sys/Cargo.toml b/ceres-solver-sys/Cargo.toml
index 098d018..7767b7e 100644
--- a/ceres-solver-sys/Cargo.toml
+++ b/ceres-solver-sys/Cargo.toml
@@ -20,7 +20,7 @@ path = "../ceres-solver-src"
 optional = true
 
 [dependencies.cxx]
-version = "1,<=1.0.129"  # 1.0.130 requires MSRV 1.70
+version = "1, <=1.0.186"  # 1.0.130 requires MSRV 1.70
 features = ["c++17"]
 
 [build-dependencies]