diff --git a/pkgs/by-name/si/silicon/Cargo.lock b/pkgs/by-name/si/silicon/Cargo.lock
index 0133214e70958..a02f14068eb6d 100644
--- a/pkgs/by-name/si/silicon/Cargo.lock
+++ b/pkgs/by-name/si/silicon/Cargo.lock
@@ -823,6 +823,12 @@ dependencies = [
  "num-traits",
 ]
 
+[[package]]
+name = "num-conv"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "51d515d32fb182ee37cda2ccdcb92950d6a3c2893aa280e540671c2cd0f3b1d9"
+
 [[package]]
 name = "num-integer"
 version = "0.1.45"
@@ -1474,12 +1480,13 @@ dependencies = [
 
 [[package]]
 name = "time"
-version = "0.3.30"
+version = "0.3.36"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c4a34ab300f2dee6e562c10a046fc05e358b29f9bf92277f30c3c8d82275f6f5"
+checksum = "5dfd88e563464686c916c7e46e623e520ddc6d79fa6641390f2e3fa86e83e885"
 dependencies = [
  "deranged",
  "itoa",
+ "num-conv",
  "powerfmt",
  "serde",
  "time-core",
@@ -1494,10 +1501,11 @@ checksum = "ef927ca75afb808a4d64dd374f00a2adf8d0fcff8e7b184af886c3c87ec4a3f3"
 
 [[package]]
 name = "time-macros"
-version = "0.2.15"
+version = "0.2.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4ad70d68dba9e1f8aceda7aa6711965dfec1cac869f311a51bd08b3a2ccbce20"
+checksum = "3f252a68540fde3a3877aeea552b832b40ab9a69e318efd078774a01ddee1ccf"
 dependencies = [
+ "num-conv",
  "time-core",
 ]
 
diff --git a/pkgs/by-name/si/silicon/package.nix b/pkgs/by-name/si/silicon/package.nix
index 18edc3b84948b..cba16e706b8c8 100644
--- a/pkgs/by-name/si/silicon/package.nix
+++ b/pkgs/by-name/si/silicon/package.nix
@@ -17,6 +17,7 @@
 
 rustPlatform.buildRustPackage rec {
   pname = "silicon";
+  # Remove `postPatch` hack below when updating.
   version = "0.5.2";
 
   src = fetchFromGitHub {
@@ -33,6 +34,11 @@ rustPlatform.buildRustPackage rec {
     };
   };
 
+  postPatch = ''
+    # Fix build with Rust 1.80; remove when fixed upstream
+    ln -sf ${./Cargo.lock} Cargo.lock
+  '';
+
   buildInputs = [ expat freetype fira-code fontconfig harfbuzz ]
     ++ lib.optionals stdenv.isLinux [ libxcb ]
     ++ lib.optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [