diff --git a/WORKSPACE.bazel b/WORKSPACE.bazel
index 5b08bbe..2aa971e 100644
--- a/WORKSPACE.bazel
+++ b/WORKSPACE.bazel
@@ -13,9 +13,9 @@ hedron_compile_commands_setup()
 
 http_archive(
     name = "com_grail_bazel_toolchain",
-    sha256 = "2d9ddd43508e291af01f49edbe5454e54c9a1bce873ca538be76ee5ee03fe874",
-    strip_prefix = "bazel-toolchain-2c25456292f0db67affd469cbdcaac5e07174fa9",
-    url = "https://github.com/grailbio/bazel-toolchain/archive/2c25456292f0db67affd469cbdcaac5e07174fa9.zip",
+    sha256 = "b50aeed35a7903388556219363a50a7351dd646fc738456493490d67744533b1",
+    strip_prefix = "bazel-toolchain-646ae7063127af2c416f80ab55037c260007b644",
+    url = "https://github.com/grailbio/bazel-toolchain/archive/646ae7063127af2c416f80ab55037c260007b644.zip",
 )
 
 load("@com_grail_bazel_toolchain//toolchain:deps.bzl", "bazel_toolchain_dependencies")