diff --git a/devenv.lock b/devenv.lock
index a1ad20462..951c7a2d4 100644
--- a/devenv.lock
+++ b/devenv.lock
@@ -263,11 +263,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1786654382,
-        "narHash": "sha256-iLt5rb+KW3LGYrUvip8Wkvo5hbeUJZoq6khK9gIhszE=",
+        "lastModified": 1788301927,
+        "narHash": "sha256-Zmcvt5yW//YLT3HYe3bWN1Sf2txYrnBpa5jLULVokc0=",
         "owner": "purpleclay",
         "repo": "go-overlay",
-        "rev": "675c971d171de06edbb1c9fc6f782b5e712edc5e",
+        "rev": "fe48ae4f56981f9f7c2bf03d4951fb0aa6e2095b",
         "type": "github"
       },
       "original": {
diff --git a/tools/toolchain/versions/go.nix b/tools/toolchain/versions/go.nix
index e31a75cc0..3a494259f 100644
--- a/tools/toolchain/versions/go.nix
+++ b/tools/toolchain/versions/go.nix
@@ -7,4 +7,4 @@
 #
 # Floor policy: the `go` directive in go/go.mod tracks this pin minus at most
 # one minor, so an upstream Go security patch never blocks on a mod edit.
-{ version = "1.26.6"; }
+{ version = "1.27.1"; }