diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 3738a96..657a3ca 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -41,7 +41,7 @@ jobs:
         # glog/log_severity.h(57): fatal error C1189: #error:  ERROR macro is defined. Define
         # GLOG_NO_ABBREVIATED_SEVERITIES before including logging.h. See the document for detail.
         os: [ "ubuntu-latest", "macos-latest" ]
-        rust_toolchain: [ "1.67", "stable" ]
+        rust_toolchain: [ "1.87", "stable" ]
 
     steps:
       - uses: actions/checkout@v4
@@ -73,7 +73,7 @@ jobs:
       matrix:
         # Help needed for Windows, vcpkg builds it, but I don't know how to make it discoverable
         os: [ "ubuntu-latest", "macos-latest" ]
-        rust_toolchain: [ "1.67", "stable" ]
+        rust_toolchain: [ "1.87", "stable" ]
 
     steps:
       - uses: actions/checkout@v4
diff --git a/Cargo.toml b/Cargo.toml
index f4153a1..d0288a7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,12 +1,12 @@
 [package]
 name = "ceres-solver"
-version = "0.4.0"
+version = "0.5.0"
 edition = "2021"
 readme = "README.md"
 description = "Safe Rust bindings for the Ceres Solver"
 repository = "https://github.com/light-curve/ceres-solver-rs"
 license = "MIT OR Apache-2.0"
-rust-version = "1.67.0"
+rust-version = "1.87.0"
 exclude = [".github"]
 
 [workspace]
@@ -22,7 +22,7 @@ source = ["ceres-solver-sys/source"]
 default = ["system"]
 
 [dependencies.ceres-solver-sys]
-version = "0.4.0"
+version = "0.5.0"
 path = "./ceres-solver-sys"
 
 [dependencies.thiserror]
diff --git a/ceres-solver-sys/Cargo.toml b/ceres-solver-sys/Cargo.toml
index 098d018..e07e772 100644
--- a/ceres-solver-sys/Cargo.toml
+++ b/ceres-solver-sys/Cargo.toml
@@ -1,12 +1,12 @@
 [package]
 name = "ceres-solver-sys"
-version = "0.4.2"
+version = "0.5.0"
 edition = "2021"
 readme = "README.md"
 description = "Unsafe Rust bindings for the Ceres Solver"
 repository = "https://github.com/light-curve/ceres-solver-rs"
 license = "MIT OR Apache-2.0"
-rust-version = "1.67.0"
+rust-version = "1.87.0"
 
 [features]
 system = ["pkg-config"]
@@ -20,12 +20,12 @@ path = "../ceres-solver-src"
 optional = true
 
 [dependencies.cxx]
-version = "1,<=1.0.129"  # 1.0.130 requires MSRV 1.70
+version = "1,<=1.0.187"
 features = ["c++17"]
 
 [build-dependencies]
 cmake = "0.1"
-cxx-build = "1,<=1.0.129"  # 1.0.130 requires MSRV 1.70
+cxx-build = "1,<=1.0.187"
 pkg-config = { version = "0.3", optional = true }
 
 [dev-dependencies]