rok · rok · Jan 20, 2026 · Jan 20, 2026 · Jan 20, 2026 · Jan 20, 2026
diff --git a/ci/conan/all/conanfile.py b/ci/conan/all/conanfile.py
@@ -163,7 +163,7 @@ def configure(self):
     def layout(self):
         cmake_layout(self, src_folder="src")
 
-    def _requires_rapidjson(self):
+    def _requires_simdjson(self):
         return self.options.with_json or self.options.encryption
 
     def requirements(self):
@@ -185,8 +185,8 @@ def requirements(self):
             self.requires("google-cloud-cpp/1.40.1")
         if self.options.with_grpc:
             self.requires("grpc/1.50.0")
-        if self._requires_rapidjson():
-            self.requires("rapidjson/1.1.0")
+        if self._requires_simdjson():
+            self.requires("simdjson/4.2.2")
         if self.options.with_llvm:
             self.requires("llvm-core/13.0.0")
         if self.options.with_openssl:
@@ -370,7 +370,7 @@ def generate(self):
         if self.options.with_lz4:
             tc.variables["ARROW_LZ4_USE_SHARED"] = bool(self.dependencies["lz4"].options.shared)
         tc.variables["ARROW_WITH_SNAPPY"] = bool(self.options.with_snappy)
-        tc.variables["RapidJSON_SOURCE"] = "SYSTEM"
+        tc.variables["simdjson_SOURCE"] = "SYSTEM"
         tc.variables["Snappy_SOURCE"] = "SYSTEM"
         if self.options.with_snappy:
             tc.variables["ARROW_SNAPPY_USE_SHARED"] = bool(self.dependencies["snappy"].options.shared)
@@ -559,8 +559,8 @@ def package_info(self):
             self.cpp_info.components["libarrow"].requires.append("libbacktrace::libbacktrace")
         if self.options.with_cuda:
             self.cpp_info.components["libarrow"].requires.append("cuda::cuda")
-        if self._requires_rapidjson():
-            self.cpp_info.components["libarrow"].requires.append("rapidjson::rapidjson")
+        if self._requires_simdjson():
+            self.cpp_info.components["libarrow"].requires.append("simdjson::simdjson")
         if self.options.with_s3:
             # https://github.com/apache/arrow/blob/6b268f62a8a172249ef35f093009c740c32e1f36/cpp/src/arrow/CMakeLists.txt#L98
             self.cpp_info.components["libarrow"].requires.extend([f"aws-sdk-cpp::{x}" for x in ["cognito-identity", "core", "identity-management", "s3", "sts"]])

diff --git a/ci/conda_env_cpp.txt b/ci/conda_env_cpp.txt
@@ -43,7 +43,7 @@ nodejs>=16
 orc<2.1.0
 pkg-config
 python
-rapidjson
+simdjson
 re2
 snappy
 thrift-cpp>=0.11.0

diff --git a/ci/docker/alpine-linux-3.22-cpp.dockerfile b/ci/docker/alpine-linux-3.22-cpp.dockerfile
@@ -55,7 +55,7 @@ RUN apk add \
         py3-pip \
         py3-numpy-dev \
         python3-dev \
-        rapidjson-dev \
+        simdjson-dev \
         re2-dev \
         rsync \
         samurai \

diff --git a/ci/docker/debian-12-cpp.dockerfile b/ci/docker/debian-12-cpp.dockerfile
@@ -91,7 +91,6 @@ RUN apt-get update -y -q && \
         python3-dev \
         python3-pip \
         python3-venv \
-        rapidjson-dev \
         rsync \
         tzdata \
         zlib1g-dev && \

diff --git a/ci/docker/debian-13-cpp.dockerfile b/ci/docker/debian-13-cpp.dockerfile
@@ -93,7 +93,6 @@ RUN apt-get update -y -q && \
         python3-dev \
         python3-pip \
         python3-venv \
-        rapidjson-dev \
         rsync \
         tzdata \
         zlib1g-dev && \

diff --git a/ci/docker/debian-experimental-cpp.dockerfile b/ci/docker/debian-experimental-cpp.dockerfile
@@ -86,7 +86,6 @@ RUN if [ -n "${gcc}" ]; then \
         python3-dev \
         python3-pip \
         python3-venv \
-        rapidjson-dev \
         rsync \
         tzdata \
         tzdata-legacy \

diff --git a/ci/docker/fedora-42-cpp.dockerfile b/ci/docker/fedora-42-cpp.dockerfile
@@ -58,7 +58,7 @@ RUN dnf update -y && \
         python \
         python-devel \
         python-pip \
-        rapidjson-devel \
+        simdjson-devel \
         re2-devel \
         snappy-devel \
         thrift-devel \

diff --git a/ci/docker/ubuntu-22.04-cpp.dockerfile b/ci/docker/ubuntu-22.04-cpp.dockerfile
@@ -116,7 +116,6 @@ RUN apt-get update -y -q && \
         python3-rados \
         python3-venv \
         rados-objclass-dev \
-        rapidjson-dev \
         rsync \
         tzdata \
         uuid-runtime \

diff --git a/ci/docker/ubuntu-24.04-cpp.dockerfile b/ci/docker/ubuntu-24.04-cpp.dockerfile
@@ -117,7 +117,6 @@ RUN apt-get update -y -q && \
         python3-rados \
         python3-venv \
         rados-objclass-dev \
-        rapidjson-dev \
         rsync \
         tzdata \
         tzdata-legacy \

diff --git a/ci/scripts/cpp_build.sh b/ci/scripts/cpp_build.sh
@@ -278,7 +278,7 @@ else
     -DPARQUET_BUILD_EXECUTABLES=${PARQUET_BUILD_EXECUTABLES:-OFF} \
     -DPARQUET_REQUIRE_ENCRYPTION=${PARQUET_REQUIRE_ENCRYPTION:-ON} \
     -DProtobuf_SOURCE=${Protobuf_SOURCE:-} \
-    -DRapidJSON_SOURCE=${RapidJSON_SOURCE:-} \
+    -Dsimdjson_SOURCE=${simdjson_SOURCE:-} \
     -Dre2_SOURCE=${re2_SOURCE:-} \
     -DSnappy_SOURCE=${Snappy_SOURCE:-} \
     -DThrift_SOURCE=${Thrift_SOURCE:-} \

diff --git a/ci/scripts/msys2_setup.sh b/ci/scripts/msys2_setup.sh
@@ -43,7 +43,7 @@ case "${target}" in
     packages+=("${MINGW_PACKAGE_PREFIX}-ninja")
     packages+=("${MINGW_PACKAGE_PREFIX}-nlohmann-json")
     packages+=("${MINGW_PACKAGE_PREFIX}-protobuf")
-    packages+=("${MINGW_PACKAGE_PREFIX}-rapidjson")
+    packages+=("${MINGW_PACKAGE_PREFIX}-simdjson")
     packages+=("${MINGW_PACKAGE_PREFIX}-re2")
     packages+=("${MINGW_PACKAGE_PREFIX}-snappy")
     packages+=("${MINGW_PACKAGE_PREFIX}-sqlite3")

diff --git a/ci/scripts/r_revdepcheck.sh b/ci/scripts/r_revdepcheck.sh
@@ -55,7 +55,7 @@ apt install -y \
   python3-pip \
   python3-rados \
   rados-objclass-dev \
-  rapidjson-dev \
+  libsimdjson-dev \
   tzdata \
   wget
 

diff --git a/ci/vcpkg/vcpkg.json b/ci/vcpkg/vcpkg.json
@@ -56,7 +56,7 @@
     "json": {
       "description": "JSON support",
       "dependencies": [
-        "rapidjson"
+        "simdjson"
       ]
     },
     "gandiva": {

diff --git a/cpp/Brewfile b/cpp/Brewfile
@@ -37,7 +37,7 @@ brew "openssl"
 brew "pkgconf"
 brew "protobuf"
 brew "python"
-brew "rapidjson"
+brew "simdjson"
 brew "re2"
 brew "snappy"
 brew "thrift"

diff --git a/cpp/build-support/sanitizer-disallowed-entries.txt b/cpp/build-support/sanitizer-disallowed-entries.txt
@@ -21,5 +21,3 @@
 # thirdparty/gmock-1.7.0/include/gmock/gmock-spec-builders.h:1529:12: runtime error: member call on null pointer of type 'testing::internal::ActionResultHolder<void>'
 fun:*testing*internal*InvokeWith*
 
-# Workaround for RapidJSON https://github.com/Tencent/rapidjson/issues/1724
-src:*/rapidjson/internal/*
diff --git a/cpp/cmake_modules/DefineOptions.cmake b/cpp/cmake_modules/DefineOptions.cmake
@@ -371,7 +371,7 @@ takes precedence over ccache if a storage backend is configured" ON)
 
   define_option(ARROW_JEMALLOC "Build the Arrow jemalloc-based allocator" OFF)
 
-  define_option(ARROW_JSON "Build Arrow with JSON support (requires RapidJSON)" OFF)
+  define_option(ARROW_JSON "Build Arrow with JSON support (requires simdjson)" OFF)
 
   define_option(ARROW_MIMALLOC "Build the Arrow mimalloc-based allocator" ON)
 

diff --git a/cpp/cmake_modules/FindRapidJSONAlt.cmake b/cpp/cmake_modules/FindRapidJSONAlt.cmake