diff --git a/build.sc b/build.sc
index 42332b5c5..41227cd03 100644
--- a/build.sc
+++ b/build.sc
@@ -20,7 +20,7 @@ import $file.common
 def buildSources = T.sources(os.pwd / "build.sc")
 
 object v {
-  val scala    = "2.13.14"
+  val scala    = "2.13.15"
   val mainargs = ivy"com.lihaoyi::mainargs:0.5.0"
   val oslib    = ivy"com.lihaoyi::os-lib:0.9.1"
   val upickle  = ivy"com.lihaoyi::upickle:3.3.1"
diff --git a/nix/t1/dependencies/_sources/generated.json b/nix/t1/dependencies/_sources/generated.json
index aff1e8df2..24ac4a0e1 100644
--- a/nix/t1/dependencies/_sources/generated.json
+++ b/nix/t1/dependencies/_sources/generated.json
@@ -41,7 +41,7 @@
     },
     "chisel": {
         "cargoLocks": null,
-        "date": "2024-09-06",
+        "date": "2024-10-08",
         "extract": null,
         "name": "chisel",
         "passthru": null,
@@ -53,11 +53,11 @@
             "name": null,
             "owner": "chipsalliance",
             "repo": "chisel",
-            "rev": "fd2ba0c73278e95df5820128062a1de1be6f4cc4",
-            "sha256": "sha256-oniOTue8NvYx+ypjB/trJzYi1RCEH16AslLlzabsVFY=",
+            "rev": "90a8d390ca6d50a4abb2518855d3a51d44b880e1",
+            "sha256": "sha256-oVhEjh1PWKzOfVLAonGUF8Twl3vt4EJQRNJ/+3tck08=",
             "type": "github"
         },
-        "version": "fd2ba0c73278e95df5820128062a1de1be6f4cc4"
+        "version": "90a8d390ca6d50a4abb2518855d3a51d44b880e1"
     },
     "chisel-interface": {
         "cargoLocks": null,
diff --git a/nix/t1/dependencies/_sources/generated.nix b/nix/t1/dependencies/_sources/generated.nix
index 3872e8249..89e5605a4 100644
--- a/nix/t1/dependencies/_sources/generated.nix
+++ b/nix/t1/dependencies/_sources/generated.nix
@@ -27,15 +27,15 @@
   };
   chisel = {
     pname = "chisel";
-    version = "fd2ba0c73278e95df5820128062a1de1be6f4cc4";
+    version = "90a8d390ca6d50a4abb2518855d3a51d44b880e1";
     src = fetchFromGitHub {
       owner = "chipsalliance";
       repo = "chisel";
-      rev = "fd2ba0c73278e95df5820128062a1de1be6f4cc4";
+      rev = "90a8d390ca6d50a4abb2518855d3a51d44b880e1";
       fetchSubmodules = false;
-      sha256 = "sha256-oniOTue8NvYx+ypjB/trJzYi1RCEH16AslLlzabsVFY=";
+      sha256 = "sha256-oVhEjh1PWKzOfVLAonGUF8Twl3vt4EJQRNJ/+3tck08=";
     };
-    date = "2024-09-06";
+    date = "2024-10-08";
   };
   chisel-interface = {
     pname = "chisel-interface";
diff --git a/nix/t1/mill-modules.nix b/nix/t1/mill-modules.nix
index 5575d2e25..8ec24af09 100644
--- a/nix/t1/mill-modules.nix
+++ b/nix/t1/mill-modules.nix
@@ -47,7 +47,7 @@ let
           ./../../.scalafmt.conf
         ];
       };
-      millDepsHash = "sha256-gBxEO6pGD0A1RxZW2isjPcHDf+b9Sr++7eq6Ezngiio=";
+      millDepsHash = "sha256-pixG96IxJsYlgIU+DVxGHky6G5nMfHXphEq5A/xLP7Q=";
       nativeBuildInputs = [ dependencies.setupHook ];
     };