chore: bump flashinfer version to 0.6.6 (#20480)

Co-authored-by: sglang-bot <sglang-bot@users.noreply.github.com>

docker/Dockerfile

@@ -19,7 +19,7 @@ ARG PIP_DEFAULT_INDEX
 ARG UBUNTU_MIRROR
 ARG GITHUB_ARTIFACTORY=github.com
 ARG INSTALL_FLASHINFER_JIT_CACHE=0
-ARG FLASHINFER_VERSION=0.6.4
+ARG FLASHINFER_VERSION=0.6.6
 ARG MOONCAKE_VERSION=0.3.9
 #if need other arg please add in MOONCAKE_COMPILE_ARG
 ARG MOONCAKE_COMPILE_ARG="-DUSE_HTTP=ON -DUSE_MNNVL=ON -DUSE_CUDA=ON -DWITH_EP=ON"

python/pyproject.toml

@@ -27,8 +27,8 @@ dependencies = [
   "datasets",
   "einops",
   "fastapi",
-  "flashinfer_python==0.6.4", # keep it aligned with jit-cache version in Dockerfile
-  "flashinfer_cubin==0.6.4",
+  "flashinfer_python==0.6.6", # keep it aligned with jit-cache version in Dockerfile
+  "flashinfer_cubin==0.6.6",
   "gguf",
   "hf_transfer",
   "huggingface_hub",

python/sglang/srt/entrypoints/engine.py

@@ -1135,7 +1135,7 @@ def _set_envs_and_config(server_args: ServerArgs):
         if server_args.attention_backend == "flashinfer":
             assert_pkg_version(
                 "flashinfer_python",
-                "0.6.4",
+                "0.6.6",
                 "Please uninstall the old version and "
                 "reinstall the latest version by following the instructions "
                 "at https://docs.flashinfer.ai/installation.html.",

python/sglang/srt/utils/common.py

@@ -1132,7 +1132,7 @@ def check_pkg_version_at_least(pkg: str, min_version: str) -> bool:
 
     Args:
         pkg: Package name (distribution name, e.g., "flashinfer-python")
-        min_version: Minimum version required (e.g., "0.6.4")
+        min_version: Minimum version required (e.g., "0.6.6")
 
     Returns:
         True if package is installed and version >= min_version, False otherwise

scripts/ci/cuda/ci_install_dependency.sh

@@ -5,7 +5,7 @@ set -euxo pipefail
 # Set up environment variables
 IS_BLACKWELL=${IS_BLACKWELL:-0}
 CU_VERSION="cu129"
-FLASHINFER_VERSION=0.6.4
+FLASHINFER_VERSION=0.6.6
 OPTIONAL_DEPS="${1:-}"
 
 # Detect system architecture