diff --git a/pkgs/development/tools/continuous-integration/buildkite-agent/default.nix b/pkgs/development/tools/continuous-integration/buildkite-agent/default.nix
index 211191c8f379..a18bfbd22b63 100644
--- a/pkgs/development/tools/continuous-integration/buildkite-agent/default.nix
+++ b/pkgs/development/tools/continuous-integration/buildkite-agent/default.nix
@@ -3,16 +3,16 @@
   nixosTests }:
 buildGoModule rec {
   pname = "buildkite-agent";
-  version = "3.39.1";
+  version = "3.40.0";
 
   src = fetchFromGitHub {
     owner = "buildkite";
     repo = "agent";
     rev = "v${version}";
-    sha256 = "sha256-sUBH0Oz1yeOgY5pmzM8XLoQ9vPiPODC6zeOO2n3meXs=";
+    sha256 = "sha256-pd5B7RW13SWtOAwJGxhJBAhihCFkL3TokhWqcy7hVFk=";
   };
 
-  vendorSha256 = "sha256-RD8BXwzrqHwgxdjpL++a9pIvzD9rfSTqguRVh+CbbnE=";
+  vendorSha256 = "sha256-+LTjtJFHdYv0zeX8RpK0tuLWRpz5jXBwA7ZOvmA6YV0=";
 
   postPatch = ''
     substituteInPlace bootstrap/shell/shell.go --replace /bin/bash ${bash}/bin/bash