diff --git a/Cargo.lock b/Cargo.lock
index 2c06015d9..1e4643f8b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2279,9 +2279,9 @@ dependencies = [
 
 [[package]]
 name = "kernal-api"
-version = "0.1.23"
+version = "0.1.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "54844116729c2a5c64d5b313d79f839323c044cc01867f7e2bf0f192ac9e6903"
+checksum = "f18d3cbb9bd8f6a590cf9b5a75297c542786fcef93bb3ff7245eb8f8b1b09561"
 dependencies = [
  "blake3",
  "crash-handler",
@@ -3422,9 +3422,9 @@ dependencies = [
 
 [[package]]
 name = "running-process"
-version = "4.10.14"
+version = "4.10.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "02f0ff903e7b61396a074648fc6301668492de90aea4b5d09cc914eee9389e9b"
+checksum = "c040ca81d60235a6027ef3115629049829464758e1011500902c8a2355727812"
 dependencies = [
  "anyhow",
  "blake3",
@@ -3453,14 +3453,15 @@ dependencies = [
 
 [[package]]
 name = "running-process-platform-internal"
-version = "4.10.14"
+version = "4.10.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c6e5db04a966dfead09ff660b704c2461a05e8477249b8f10532b41a22219348"
+checksum = "0ef39418f8c71399ea811c5daba36f2325516cc02c3b2169473400411941ed5f"
 dependencies = [
  "blake3",
  "dirs",
  "interprocess",
  "libc",
+ "miniz_oxide",
  "sysinfo",
  "thiserror 2.0.20",
  "tokio",
@@ -3471,9 +3472,9 @@ dependencies = [
 
 [[package]]
 name = "running-process-probe"
-version = "4.10.14"
+version = "4.10.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "42a44810a8ff3d44214a02b2de688a8004cd35fe66c585cde273770d49860a68"
+checksum = "68d60cba7103c84759e85cd98778c44090d01627b1eebbf79c72270c32f772b7"
 dependencies = [
  "crash-handler",
  "framehop",
@@ -3484,6 +3485,7 @@ dependencies = [
  "prost",
  "prost-build",
  "protox",
+ "running-process-platform-internal",
  "thiserror 2.0.20",
  "winapi",
  "windows-sys 0.61.2",
@@ -3491,9 +3493,9 @@ dependencies = [
 
 [[package]]
 name = "running-process-probe-daemon"
-version = "4.10.14"
+version = "4.10.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6276bcbbdb64c0db39e087c2f24fcd02916038550f362bef8a1798506048500d"
+checksum = "1de6766e359cc87de9d22acfee67defd759172c8dfddd6b40c9257e5e3d359b8"
 dependencies = [
  "axum 0.8.9",
  "blake3",
@@ -3510,6 +3512,7 @@ dependencies = [
  "protox",
  "regex",
  "running-process",
+ "running-process-platform-internal",
  "running-process-probe",
  "rusqlite",
  "serde",
@@ -3526,9 +3529,9 @@ dependencies = [
 
 [[package]]
 name = "running-process-protocol"
-version = "4.10.14"
+version = "4.10.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c32daa00db0c79106d3181f1e306efe92a59bd1b0429440bdc5e6debf3cc4345"
+checksum = "c51894dfa970ac24213066f37b33656fd92c7053ef3e94f184b70000d8cf48f7"
 dependencies = [
  "prost",
  "prost-build",
@@ -5082,8 +5085,8 @@ dependencies = [
 
 [[package]]
 name = "zccache"
-version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
+version = "1.15.6"
+source = "git+https://github.com/zackees/zccache?rev=15ec9537af0d219e07b72ce2b3f97d5f68d72b5e#15ec9537af0d219e07b72ce2b3f97d5f68d72b5e"
 dependencies = [
  "arc-swap",
  "bincode",
@@ -5123,8 +5126,8 @@ dependencies = [
 
 [[package]]
 name = "zccache-artifact"
-version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
+version = "1.15.6"
+source = "git+https://github.com/zackees/zccache?rev=15ec9537af0d219e07b72ce2b3f97d5f68d72b5e#15ec9537af0d219e07b72ce2b3f97d5f68d72b5e"
 dependencies = [
  "bincode",
  "dashmap",
@@ -5142,8 +5145,8 @@ dependencies = [
 
 [[package]]
 name = "zccache-audit"
-version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
+version = "1.15.6"
+source = "git+https://github.com/zackees/zccache?rev=15ec9537af0d219e07b72ce2b3f97d5f68d72b5e#15ec9537af0d219e07b72ce2b3f97d5f68d72b5e"
 dependencies = [
  "serde",
  "serde_json",
@@ -5152,16 +5155,16 @@ dependencies = [
 
 [[package]]
 name = "zccache-compile-trace"
-version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
+version = "1.15.6"
+source = "git+https://github.com/zackees/zccache?rev=15ec9537af0d219e07b72ce2b3f97d5f68d72b5e#15ec9537af0d219e07b72ce2b3f97d5f68d72b5e"
 dependencies = [
  "zccache-audit",
 ]
 
 [[package]]
 name = "zccache-compiler"
-version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
+version = "1.15.6"
+source = "git+https://github.com/zackees/zccache?rev=15ec9537af0d219e07b72ce2b3f97d5f68d72b5e#15ec9537af0d219e07b72ce2b3f97d5f68d72b5e"
 dependencies = [
  "clang",
  "kernal-api",
@@ -5174,8 +5177,8 @@ dependencies = [
 
 [[package]]
 name = "zccache-core"
-version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
+version = "1.15.6"
+source = "git+https://github.com/zackees/zccache?rev=15ec9537af0d219e07b72ce2b3f97d5f68d72b5e#15ec9537af0d219e07b72ce2b3f97d5f68d72b5e"
 dependencies = [
  "kernal-api",
  "serde",
@@ -5186,8 +5189,8 @@ dependencies = [
 
 [[package]]
 name = "zccache-daemon-core"
-version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
+version = "1.15.6"
+source = "git+https://github.com/zackees/zccache?rev=15ec9537af0d219e07b72ce2b3f97d5f68d72b5e#15ec9537af0d219e07b72ce2b3f97d5f68d72b5e"
 dependencies = [
  "arc-swap",
  "bincode",
@@ -5195,6 +5198,7 @@ dependencies = [
  "clang",
  "dashmap",
  "kernal-api",
+ "memchr",
  "prost",
  "rayon",
  "regex",
@@ -5222,8 +5226,8 @@ dependencies = [
 
 [[package]]
 name = "zccache-depgraph"
-version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
+version = "1.15.6"
+source = "git+https://github.com/zackees/zccache?rev=15ec9537af0d219e07b72ce2b3f97d5f68d72b5e#15ec9537af0d219e07b72ce2b3f97d5f68d72b5e"
 dependencies = [
  "bincode",
  "dashmap",
@@ -5242,8 +5246,8 @@ dependencies = [
 
 [[package]]
 name = "zccache-fingerprint"
-version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
+version = "1.15.6"
+source = "git+https://github.com/zackees/zccache?rev=15ec9537af0d219e07b72ce2b3f97d5f68d72b5e#15ec9537af0d219e07b72ce2b3f97d5f68d72b5e"
 dependencies = [
  "kernal-api",
  "rayon",
@@ -5251,14 +5255,15 @@ dependencies = [
  "serde_json",
  "thiserror 2.0.20",
  "tracing",
+ "twox-hash",
  "zccache-core",
  "zccache-hash",
 ]
 
 [[package]]
 name = "zccache-fscache"
-version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
+version = "1.15.6"
+source = "git+https://github.com/zackees/zccache?rev=15ec9537af0d219e07b72ce2b3f97d5f68d72b5e#15ec9537af0d219e07b72ce2b3f97d5f68d72b5e"
 dependencies = [
  "bincode",
  "dashmap",
@@ -5272,8 +5277,8 @@ dependencies = [
 
 [[package]]
 name = "zccache-hash"
-version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
+version = "1.15.6"
+source = "git+https://github.com/zackees/zccache?rev=15ec9537af0d219e07b72ce2b3f97d5f68d72b5e#15ec9537af0d219e07b72ce2b3f97d5f68d72b5e"
 dependencies = [
  "kernal-api",
  "serde",
@@ -5281,8 +5286,8 @@ dependencies = [
 
 [[package]]
 name = "zccache-ipc"
-version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
+version = "1.15.6"
+source = "git+https://github.com/zackees/zccache?rev=15ec9537af0d219e07b72ce2b3f97d5f68d72b5e#15ec9537af0d219e07b72ce2b3f97d5f68d72b5e"
 dependencies = [
  "bytes",
  "dashmap",
@@ -5299,8 +5304,8 @@ dependencies = [
 
 [[package]]
 name = "zccache-protocol"
-version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
+version = "1.15.6"
+source = "git+https://github.com/zackees/zccache?rev=15ec9537af0d219e07b72ce2b3f97d5f68d72b5e#15ec9537af0d219e07b72ce2b3f97d5f68d72b5e"
 dependencies = [
  "bytes",
  "kernal-api",
@@ -5315,8 +5320,8 @@ dependencies = [
 
 [[package]]
 name = "zccache-watcher"
-version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
+version = "1.15.6"
+source = "git+https://github.com/zackees/zccache?rev=15ec9537af0d219e07b72ce2b3f97d5f68d72b5e#15ec9537af0d219e07b72ce2b3f97d5f68d72b5e"
 dependencies = [
  "kernal-api",
  "rayon",
diff --git a/Cargo.toml b/Cargo.toml
index cd0791fcd..247451989 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -156,7 +156,7 @@ mimalloc-pprof = "0.9"
 # something the shipped daemon links. The version MUST equal the
 # `running-process` rev pinned above, for the same `rp_*_public`
 # symbol-duplication reason documented there.
-running-process-probe-daemon = "=4.10.14"
+running-process-probe-daemon = "=4.10.16"
 object = { version = "0.36", default-features = false, features = ["read", "std", "elf", "write"] }
 rusqlite = { version = "0.32", features = ["bundled"] }
 shell-words = "1"
@@ -196,13 +196,13 @@ owo-colors = "4"
 # loopback-HTTP path (see crates/fbuild-daemon/src/broker).
 #
 # Source must match zccache's `running-process` pin exactly (same source and
-# version, not just the same semver; zccache takes =4.10.14 from crates.io). `running-process` exports unmangled `rp_*_public` C
+# version, not just the same semver; zccache takes =4.10.16 from crates.io). `running-process` exports unmangled `rp_*_public` C
 # symbols; Cargo treats a registry package and a git package as two distinct
 # packages, so a registry pin here plus zccache's git pin puts BOTH copies in
 # the link and every one of those symbols collides (`rust-lld: error:
 # duplicate symbol: rp_native_process_start_public`, …). Keep this pin in
 # lockstep with zccache's resolved `running-process` when repinning zccache.
-running-process = { version = "=4.10.14", default-features = false, features = ["client-async"] }
+running-process = { version = "=4.10.16", default-features = false, features = ["client-async"] }
 
 [profile.dev]
 debug = "line-tables-only"
diff --git a/crates/fbuild-build-arm/Cargo.toml b/crates/fbuild-build-arm/Cargo.toml
index 57af300f9..081df5eff 100644
--- a/crates/fbuild-build-arm/Cargo.toml
+++ b/crates/fbuild-build-arm/Cargo.toml
@@ -34,7 +34,7 @@ tar = { workspace = true }
 zip = { workspace = true }
 tree-sitter = { workspace = true }
 tree-sitter-cpp = { workspace = true }
-zccache = { git = "https://github.com/zackees/zccache", rev = "b385a7bfb308c2d1456613622ad361eb66d31cdd" }
+zccache = { git = "https://github.com/zackees/zccache", rev = "15ec9537af0d219e07b72ce2b3f97d5f68d72b5e" }
 
 [dev-dependencies]
 filetime = { workspace = true }
diff --git a/crates/fbuild-build-engine/Cargo.toml b/crates/fbuild-build-engine/Cargo.toml
index be590276d..1620c7dd8 100644
--- a/crates/fbuild-build-engine/Cargo.toml
+++ b/crates/fbuild-build-engine/Cargo.toml
@@ -35,7 +35,7 @@ tar = { workspace = true }
 zip = { workspace = true }
 tree-sitter = { workspace = true }
 tree-sitter-cpp = { workspace = true }
-zccache = { git = "https://github.com/zackees/zccache", rev = "b385a7bfb308c2d1456613622ad361eb66d31cdd" }
+zccache = { git = "https://github.com/zackees/zccache", rev = "15ec9537af0d219e07b72ce2b3f97d5f68d72b5e" }
 
 [dev-dependencies]
 filetime = { workspace = true }
diff --git a/crates/fbuild-build-esp/Cargo.toml b/crates/fbuild-build-esp/Cargo.toml
index b4a434491..4952cad02 100644
--- a/crates/fbuild-build-esp/Cargo.toml
+++ b/crates/fbuild-build-esp/Cargo.toml
@@ -35,7 +35,7 @@ tar = { workspace = true }
 zip = { workspace = true }
 tree-sitter = { workspace = true }
 tree-sitter-cpp = { workspace = true }
-zccache = { git = "https://github.com/zackees/zccache", rev = "b385a7bfb308c2d1456613622ad361eb66d31cdd" }
+zccache = { git = "https://github.com/zackees/zccache", rev = "15ec9537af0d219e07b72ce2b3f97d5f68d72b5e" }
 
 [dev-dependencies]
 filetime = { workspace = true }
diff --git a/crates/fbuild-build-mcu/Cargo.toml b/crates/fbuild-build-mcu/Cargo.toml
index 6523f35be..6dfbc1a3c 100644
--- a/crates/fbuild-build-mcu/Cargo.toml
+++ b/crates/fbuild-build-mcu/Cargo.toml
@@ -34,7 +34,7 @@ tar = { workspace = true }
 zip = { workspace = true }
 tree-sitter = { workspace = true }
 tree-sitter-cpp = { workspace = true }
-zccache = { git = "https://github.com/zackees/zccache", rev = "b385a7bfb308c2d1456613622ad361eb66d31cdd" }
+zccache = { git = "https://github.com/zackees/zccache", rev = "15ec9537af0d219e07b72ce2b3f97d5f68d72b5e" }
 
 [dev-dependencies]
 filetime = { workspace = true }
diff --git a/crates/fbuild-build/Cargo.toml b/crates/fbuild-build/Cargo.toml
index 9c98b969f..af445efd5 100644
--- a/crates/fbuild-build/Cargo.toml
+++ b/crates/fbuild-build/Cargo.toml
@@ -52,13 +52,13 @@ tree-sitter-cpp = { workspace = true }
 # work: #1768's heartbeat-free compile requests, #1770's mtime-floor skip on
 # C/C++ hits, #1761/#1763's dropped durability syncs, #1775 unchanged-state
 # shutdown skip), which takes
-# running-process =4.10.14 from crates.io. Keep both pins aligned when
+# running-process =4.10.16 from crates.io. Keep both pins aligned when
 # repinning so fbuild links exactly one copy of the exported broker symbols.
 #
 # `running-process` in the workspace root must be pinned to the SAME source
 # and version zccache uses, or its unmangled `rp_*_public` C symbols get
 # linked twice (guarded by crates/fbuild-core/tests/dep_identity.rs).
-zccache = { git = "https://github.com/zackees/zccache", rev = "b385a7bfb308c2d1456613622ad361eb66d31cdd" }
+zccache = { git = "https://github.com/zackees/zccache", rev = "15ec9537af0d219e07b72ce2b3f97d5f68d72b5e" }
 
 [dev-dependencies]
 filetime = { workspace = true }