diff --git a/Cargo.lock b/Cargo.lock
index 6e25bdb2..bfbdf512 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -879,7 +879,7 @@ dependencies = [
  "libc",
  "option-ext",
  "redox_users",
- "windows-sys 0.59.0",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -918,7 +918,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "39cab71617ae0d63f51a36d69f866391735b51691dbda63cf6f96d042b63efeb"
 dependencies = [
  "libc",
- "windows-sys 0.59.0",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -2239,7 +2239,7 @@ checksum = "3640c1c38b8e4e43584d8df18be5fc6b0aa314ce6ebf51b53313d4306cca8e46"
 dependencies = [
  "hermit-abi",
  "libc",
- "windows-sys 0.59.0",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -2685,7 +2685,7 @@ version = "0.50.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7957b9740744892f114936ab4a57b3f487491bbeafaf8083688b16841a4240e5"
 dependencies = [
- "windows-sys 0.59.0",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -3581,7 +3581,7 @@ dependencies = [
  "errno",
  "libc",
  "linux-raw-sys",
- "windows-sys 0.59.0",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -4016,7 +4016,7 @@ dependencies = [
  "getrandom 0.4.3",
  "once_cell",
  "rustix",
- "windows-sys 0.59.0",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -4776,7 +4776,7 @@ version = "0.1.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c2a7b1c03c876122aa43f3020e6c3c3ee5c05081c9a00739faf7503aeba10d22"
 dependencies = [
- "windows-sys 0.59.0",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -5089,7 +5089,7 @@ dependencies = [
 [[package]]
 name = "zccache"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
+source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
 dependencies = [
  "arc-swap",
  "bincode",
@@ -5130,7 +5130,7 @@ dependencies = [
 [[package]]
 name = "zccache-artifact"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
+source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
 dependencies = [
  "bincode",
  "dashmap",
@@ -5149,7 +5149,7 @@ dependencies = [
 [[package]]
 name = "zccache-audit"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
+source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
 dependencies = [
  "serde",
  "serde_json",
@@ -5159,7 +5159,7 @@ dependencies = [
 [[package]]
 name = "zccache-compile-trace"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
+source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
 dependencies = [
  "zccache-audit",
 ]
@@ -5167,7 +5167,7 @@ dependencies = [
 [[package]]
 name = "zccache-compiler"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
+source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
 dependencies = [
  "clang",
  "kernal-api",
@@ -5181,7 +5181,7 @@ dependencies = [
 [[package]]
 name = "zccache-core"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
+source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
 dependencies = [
  "kernal-api",
  "serde",
@@ -5193,7 +5193,7 @@ dependencies = [
 [[package]]
 name = "zccache-daemon-core"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
+source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
 dependencies = [
  "arc-swap",
  "bincode",
@@ -5229,7 +5229,7 @@ dependencies = [
 [[package]]
 name = "zccache-depgraph"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
+source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
 dependencies = [
  "bincode",
  "dashmap",
@@ -5249,7 +5249,7 @@ dependencies = [
 [[package]]
 name = "zccache-fingerprint"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
+source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
 dependencies = [
  "kernal-api",
  "rayon",
@@ -5264,7 +5264,7 @@ dependencies = [
 [[package]]
 name = "zccache-fscache"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
+source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
 dependencies = [
  "bincode",
  "dashmap",
@@ -5279,7 +5279,7 @@ dependencies = [
 [[package]]
 name = "zccache-hash"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
+source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
 dependencies = [
  "kernal-api",
  "serde",
@@ -5288,7 +5288,7 @@ dependencies = [
 [[package]]
 name = "zccache-ipc"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
+source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
 dependencies = [
  "bytes",
  "dashmap",
@@ -5306,7 +5306,7 @@ dependencies = [
 [[package]]
 name = "zccache-protocol"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
+source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
 dependencies = [
  "bytes",
  "kernal-api",
@@ -5322,7 +5322,7 @@ dependencies = [
 [[package]]
 name = "zccache-watcher"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
+source = "git+https://github.com/zackees/zccache?rev=b385a7bfb308c2d1456613622ad361eb66d31cdd#b385a7bfb308c2d1456613622ad361eb66d31cdd"
 dependencies = [
  "kernal-api",
  "rayon",
diff --git a/crates/fbuild-build-arm/Cargo.toml b/crates/fbuild-build-arm/Cargo.toml
index b5ec0d87..80dbd052 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 = "9bc8b4dc98335538094b7e5c08a5c519a5046408" }
+zccache = { git = "https://github.com/zackees/zccache", rev = "b385a7bfb308c2d1456613622ad361eb66d31cdd" }
 
 [dev-dependencies]
 filetime = { workspace = true }
diff --git a/crates/fbuild-build-engine/Cargo.toml b/crates/fbuild-build-engine/Cargo.toml
index 67f20561..376f2035 100644
--- a/crates/fbuild-build-engine/Cargo.toml
+++ b/crates/fbuild-build-engine/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 = "9bc8b4dc98335538094b7e5c08a5c519a5046408" }
+zccache = { git = "https://github.com/zackees/zccache", rev = "b385a7bfb308c2d1456613622ad361eb66d31cdd" }
 
 [dev-dependencies]
 filetime = { workspace = true }
diff --git a/crates/fbuild-build-esp/Cargo.toml b/crates/fbuild-build-esp/Cargo.toml
index 1aecf929..1b84bb59 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 = "9bc8b4dc98335538094b7e5c08a5c519a5046408" }
+zccache = { git = "https://github.com/zackees/zccache", rev = "b385a7bfb308c2d1456613622ad361eb66d31cdd" }
 
 [dev-dependencies]
 filetime = { workspace = true }
diff --git a/crates/fbuild-build-mcu/Cargo.toml b/crates/fbuild-build-mcu/Cargo.toml
index a6428fc6..31d51013 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 = "9bc8b4dc98335538094b7e5c08a5c519a5046408" }
+zccache = { git = "https://github.com/zackees/zccache", rev = "b385a7bfb308c2d1456613622ad361eb66d31cdd" }
 
 [dev-dependencies]
 filetime = { workspace = true }
diff --git a/crates/fbuild-build/Cargo.toml b/crates/fbuild-build/Cargo.toml
index 697df26c..4ddd5d1c 100644
--- a/crates/fbuild-build/Cargo.toml
+++ b/crates/fbuild-build/Cargo.toml
@@ -48,17 +48,17 @@ tree-sitter-cpp = { workspace = true }
 # child processes) was deleted in the same PR; there is no
 # `--no-default-features` escape hatch.
 #
-# Pinned at zccache main `3f9d4e6` (1.14.14 + zackees/zccache#1670's
-# single-pass include lexer, #1708's single-flight toolchain probes
-# (FastLED/fbuild#1464/#1466), and #1710's non-blocking embedded bring-up
-# plus periodic metadata snapshot (FastLED/fbuild#1480)), which takes
+# Pinned at zccache main `b385a7b` (1.14.14 plus its post-release perf
+# 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
 # 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 = "9bc8b4dc98335538094b7e5c08a5c519a5046408" }
+zccache = { git = "https://github.com/zackees/zccache", rev = "b385a7bfb308c2d1456613622ad361eb66d31cdd" }
 
 [dev-dependencies]
 filetime = { workspace = true }