diff --git a/Cargo.lock b/Cargo.lock
index 083129a1..69f22c61 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -879,7 +879,7 @@ dependencies = [
  "libc",
  "option-ext",
  "redox_users",
- "windows-sys 0.61.2",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -918,7 +918,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "39cab71617ae0d63f51a36d69f866391735b51691dbda63cf6f96d042b63efeb"
 dependencies = [
  "libc",
- "windows-sys 0.61.2",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -2236,7 +2236,7 @@ checksum = "3640c1c38b8e4e43584d8df18be5fc6b0aa314ce6ebf51b53313d4306cca8e46"
 dependencies = [
  "hermit-abi",
  "libc",
- "windows-sys 0.61.2",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -2294,9 +2294,9 @@ dependencies = [
 
 [[package]]
 name = "kernal-api"
-version = "0.1.22"
+version = "0.1.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b423567556c31193c3000b520ff23b82943de1d87c4515ab1428c742c0ce118a"
+checksum = "54844116729c2a5c64d5b313d79f839323c044cc01867f7e2bf0f192ac9e6903"
 dependencies = [
  "blake3",
  "crash-handler",
@@ -2682,7 +2682,7 @@ version = "0.50.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7957b9740744892f114936ab4a57b3f487491bbeafaf8083688b16841a4240e5"
 dependencies = [
- "windows-sys 0.61.2",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -3578,7 +3578,7 @@ dependencies = [
  "errno",
  "libc",
  "linux-raw-sys",
- "windows-sys 0.61.2",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -4013,7 +4013,7 @@ dependencies = [
  "getrandom 0.4.3",
  "once_cell",
  "rustix",
- "windows-sys 0.61.2",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -4773,7 +4773,7 @@ version = "0.1.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c2a7b1c03c876122aa43f3020e6c3c3ee5c05081c9a00739faf7503aeba10d22"
 dependencies = [
- "windows-sys 0.61.2",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -5086,7 +5086,7 @@ dependencies = [
 [[package]]
 name = "zccache"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=3f9d4e66fe3675cd48060bca03b62b1f5a8112eb#3f9d4e66fe3675cd48060bca03b62b1f5a8112eb"
+source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
 dependencies = [
  "arc-swap",
  "bincode",
@@ -5127,7 +5127,7 @@ dependencies = [
 [[package]]
 name = "zccache-artifact"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=3f9d4e66fe3675cd48060bca03b62b1f5a8112eb#3f9d4e66fe3675cd48060bca03b62b1f5a8112eb"
+source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
 dependencies = [
  "bincode",
  "dashmap",
@@ -5146,7 +5146,7 @@ dependencies = [
 [[package]]
 name = "zccache-audit"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=3f9d4e66fe3675cd48060bca03b62b1f5a8112eb#3f9d4e66fe3675cd48060bca03b62b1f5a8112eb"
+source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
 dependencies = [
  "serde",
  "serde_json",
@@ -5156,7 +5156,7 @@ dependencies = [
 [[package]]
 name = "zccache-compile-trace"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=3f9d4e66fe3675cd48060bca03b62b1f5a8112eb#3f9d4e66fe3675cd48060bca03b62b1f5a8112eb"
+source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
 dependencies = [
  "zccache-audit",
 ]
@@ -5164,7 +5164,7 @@ dependencies = [
 [[package]]
 name = "zccache-compiler"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=3f9d4e66fe3675cd48060bca03b62b1f5a8112eb#3f9d4e66fe3675cd48060bca03b62b1f5a8112eb"
+source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
 dependencies = [
  "clang",
  "kernal-api",
@@ -5178,7 +5178,7 @@ dependencies = [
 [[package]]
 name = "zccache-core"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=3f9d4e66fe3675cd48060bca03b62b1f5a8112eb#3f9d4e66fe3675cd48060bca03b62b1f5a8112eb"
+source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
 dependencies = [
  "kernal-api",
  "serde",
@@ -5190,7 +5190,7 @@ dependencies = [
 [[package]]
 name = "zccache-daemon-core"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=3f9d4e66fe3675cd48060bca03b62b1f5a8112eb#3f9d4e66fe3675cd48060bca03b62b1f5a8112eb"
+source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
 dependencies = [
  "arc-swap",
  "bincode",
@@ -5203,6 +5203,7 @@ dependencies = [
  "regex",
  "serde",
  "serde_json",
+ "sha2",
  "tempfile",
  "thiserror 2.0.20",
  "tokio",
@@ -5225,7 +5226,7 @@ dependencies = [
 [[package]]
 name = "zccache-depgraph"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=3f9d4e66fe3675cd48060bca03b62b1f5a8112eb#3f9d4e66fe3675cd48060bca03b62b1f5a8112eb"
+source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
 dependencies = [
  "bincode",
  "dashmap",
@@ -5245,7 +5246,7 @@ dependencies = [
 [[package]]
 name = "zccache-fingerprint"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=3f9d4e66fe3675cd48060bca03b62b1f5a8112eb#3f9d4e66fe3675cd48060bca03b62b1f5a8112eb"
+source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
 dependencies = [
  "kernal-api",
  "rayon",
@@ -5260,7 +5261,7 @@ dependencies = [
 [[package]]
 name = "zccache-fscache"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=3f9d4e66fe3675cd48060bca03b62b1f5a8112eb#3f9d4e66fe3675cd48060bca03b62b1f5a8112eb"
+source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
 dependencies = [
  "bincode",
  "dashmap",
@@ -5275,7 +5276,7 @@ dependencies = [
 [[package]]
 name = "zccache-hash"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=3f9d4e66fe3675cd48060bca03b62b1f5a8112eb#3f9d4e66fe3675cd48060bca03b62b1f5a8112eb"
+source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
 dependencies = [
  "kernal-api",
  "serde",
@@ -5284,7 +5285,7 @@ dependencies = [
 [[package]]
 name = "zccache-ipc"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=3f9d4e66fe3675cd48060bca03b62b1f5a8112eb#3f9d4e66fe3675cd48060bca03b62b1f5a8112eb"
+source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
 dependencies = [
  "bytes",
  "dashmap",
@@ -5302,7 +5303,7 @@ dependencies = [
 [[package]]
 name = "zccache-protocol"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=3f9d4e66fe3675cd48060bca03b62b1f5a8112eb#3f9d4e66fe3675cd48060bca03b62b1f5a8112eb"
+source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
 dependencies = [
  "bytes",
  "kernal-api",
@@ -5318,7 +5319,7 @@ dependencies = [
 [[package]]
 name = "zccache-watcher"
 version = "1.14.14"
-source = "git+https://github.com/zackees/zccache?rev=3f9d4e66fe3675cd48060bca03b62b1f5a8112eb#3f9d4e66fe3675cd48060bca03b62b1f5a8112eb"
+source = "git+https://github.com/zackees/zccache?rev=9bc8b4dc98335538094b7e5c08a5c519a5046408#9bc8b4dc98335538094b7e5c08a5c519a5046408"
 dependencies = [
  "kernal-api",
  "rayon",
diff --git a/crates/fbuild-build-arm/Cargo.toml b/crates/fbuild-build-arm/Cargo.toml
index 4a39f9d7..b5ec0d87 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 = "3f9d4e66fe3675cd48060bca03b62b1f5a8112eb" }
+zccache = { git = "https://github.com/zackees/zccache", rev = "9bc8b4dc98335538094b7e5c08a5c519a5046408" }
 
 [dev-dependencies]
 filetime = { workspace = true }
diff --git a/crates/fbuild-build-engine/Cargo.toml b/crates/fbuild-build-engine/Cargo.toml
index c38a570e..67f20561 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 = "3f9d4e66fe3675cd48060bca03b62b1f5a8112eb" }
+zccache = { git = "https://github.com/zackees/zccache", rev = "9bc8b4dc98335538094b7e5c08a5c519a5046408" }
 
 [dev-dependencies]
 filetime = { workspace = true }
diff --git a/crates/fbuild-build-esp/Cargo.toml b/crates/fbuild-build-esp/Cargo.toml
index 2d41c67d..f5a5f03c 100644
--- a/crates/fbuild-build-esp/Cargo.toml
+++ b/crates/fbuild-build-esp/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 = "3f9d4e66fe3675cd48060bca03b62b1f5a8112eb" }
+zccache = { git = "https://github.com/zackees/zccache", rev = "9bc8b4dc98335538094b7e5c08a5c519a5046408" }
 
 [dev-dependencies]
 filetime = { workspace = true }
diff --git a/crates/fbuild-build-mcu/Cargo.toml b/crates/fbuild-build-mcu/Cargo.toml
index 7a706edf..a6428fc6 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 = "3f9d4e66fe3675cd48060bca03b62b1f5a8112eb" }
+zccache = { git = "https://github.com/zackees/zccache", rev = "9bc8b4dc98335538094b7e5c08a5c519a5046408" }
 
 [dev-dependencies]
 filetime = { workspace = true }
diff --git a/crates/fbuild-build/Cargo.toml b/crates/fbuild-build/Cargo.toml
index 67bf17d0..697df26c 100644
--- a/crates/fbuild-build/Cargo.toml
+++ b/crates/fbuild-build/Cargo.toml
@@ -58,7 +58,7 @@ tree-sitter-cpp = { workspace = true }
 # `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 = "3f9d4e66fe3675cd48060bca03b62b1f5a8112eb" }
+zccache = { git = "https://github.com/zackees/zccache", rev = "9bc8b4dc98335538094b7e5c08a5c519a5046408" }
 
 [dev-dependencies]
 filetime = { workspace = true }