diff --git a/fun/dt/default.nix b/fun/dt/default.nix
index a1a82d361..b6efa2899 100644
--- a/fun/dt/default.nix
+++ b/fun/dt/default.nix
@@ -1,7 +1,7 @@
 { depot, pkgs, ... }:
 
 let
-  stdenv = with pkgs; overrideCC clangStdenv clang_9;
+  stdenv = with pkgs; overrideCC clangStdenv clang_10;
   abseil_cpp = pkgs.abseil_cpp.override { inherit stdenv; };
 in stdenv.mkDerivation {
   name = "dt";
diff --git a/ops/nixos/nugget/default.nix b/ops/nixos/nugget/default.nix
index f9093f728..3bb46166b 100644
--- a/ops/nixos/nugget/default.nix
+++ b/ops/nixos/nugget/default.nix
@@ -106,7 +106,7 @@ in depot.lib.fix(self: {
       chromium
       clang-manpages
       clang-tools
-      clang_9
+      clang_10
       curl
       direnv
       dnsutils
diff --git a/third_party/cpp/googleapis/default.nix b/third_party/cpp/googleapis/default.nix
index 76a1f7ed6..bb1737bb9 100644
--- a/third_party/cpp/googleapis/default.nix
+++ b/third_party/cpp/googleapis/default.nix
@@ -4,7 +4,7 @@
 
 let
   inherit (pkgs) fetchFromGitHub;
-  stdenv = with pkgs; overrideCC pkgs.stdenv clang_9;
+  stdenv = with pkgs; overrideCC pkgs.stdenv clang_10;
 in stdenv.mkDerivation {
   name = "googleapis-cpp";
   src = ./.;
diff --git a/third_party/default.nix b/third_party/default.nix
index 0ef3d15d0..2280af9b8 100644
--- a/third_party/default.nix
+++ b/third_party/default.nix
@@ -35,7 +35,7 @@ let
       cgit
       clang-tools
       clangStdenv
-      clang_9
+      clang_10
       cmake
       coreutils
       cudatoolkit
diff --git a/third_party/nix/default.nix b/third_party/nix/default.nix
index d7a85bb61..c21a6d00c 100644
--- a/third_party/nix/default.nix
+++ b/third_party/nix/default.nix
@@ -1,7 +1,7 @@
 { pkgs ? (import <nixpkgs> {}).third_party, ... }:
 
 let
-  stdenv = with pkgs; overrideCC clangStdenv clang_9;
+  stdenv = with pkgs; overrideCC clangStdenv clang_10;
 
   aws-s3-cpp = pkgs.aws-sdk-cpp.override {
     apis = ["s3" "transfer"];