diff --git a/proposals/cli/wit-0.3.0-draft/deps.lock b/proposals/cli/wit-0.3.0-draft/deps.lock
index c6708067..ae83cf82 100644
--- a/proposals/cli/wit-0.3.0-draft/deps.lock
+++ b/proposals/cli/wit-0.3.0-draft/deps.lock
@@ -5,8 +5,8 @@ sha512 = "f08a2828b88fc6ddea935af584531c484ad4a7a5f30340265e11e91b2bfe0f81e74a66
 
 [filesystem]
 path = "../../filesystem/wit-0.3.0-draft"
-sha256 = "8808ea3adfbc1a025d649b82ddf4f38232ca4377100cfe671d80d5ee37fa3147"
-sha512 = "19f4eb8fa62e96ba37b3ea231af6a3bc396c28f82935018a3322441321936b34fb0e44360b378145fcb681d9fea810745969d8baab02ae6017be1784be8abe45"
+sha256 = "34bc01576895f955af8f55c67ae45445b092645af1939cf3535159285338cbb2"
+sha512 = "3b666d90f2e1d1b3d4229d5c6b24e4b044f901cbfee3c6309f1548571361ad59ba1a344200bf443800a7f0d4babbd4613f99266fff490b33a75c5b74928e1ffd"
 
 [random]
 path = "../../random/wit-0.3.0-draft"
@@ -15,5 +15,5 @@ sha512 = "ac1a04d180f8aa11ac82529a0de7ff01c8d51d10424806aefe1c1d52ea9ade9911eaee
 
 [sockets]
 path = "../../sockets/wit-0.3.0-draft"
-sha256 = "5e7010b31fc80b5484cdcad7bfaae9dbb2134d3debfa6a90c69c30ec8cf7d55e"
-sha512 = "3863bd53d4ef1815f0f0f48d4032e3232322a3dbfa875eb573df2940264aacfe55d672886323406e5942ffc38ed5ad7dce91fcff3ff1e2e072773bb6dd9c7cd1"
+sha256 = "b49fc1dce25d91cb10d4d503c7f9a870a5effabcce609542f1eeabe41500af63"
+sha512 = "5007b7df0f421f32db7885fc140c5b68e430f7e0894efcd1152d9a0f2ff18808828dbe6c4d6d3fa88fbfc19bd608ffe1737c0eea3146a8232b2a9ea9a5468427"
diff --git a/proposals/filesystem/wit-0.3.0-draft/types.wit b/proposals/filesystem/wit-0.3.0-draft/types.wit
index 6b43b97a..f244825b 100644
--- a/proposals/filesystem/wit-0.3.0-draft/types.wit
+++ b/proposals/filesystem/wit-0.3.0-draft/types.wit
@@ -192,7 +192,7 @@ interface types {
     /// API; some are used in higher-level library layers, and others are provided
     /// merely for alignment with POSIX.
     @since(version = 0.3.0-rc-2026-02-09)
-    enum error-code {
+    variant error-code {
         /// Permission denied, similar to `EACCES` in POSIX.
         access,
         /// Connection already in progress, similar to `EALREADY` in POSIX.
@@ -265,6 +265,10 @@ interface types {
         text-file-busy,
         /// Cross-device link, similar to `EXDEV` in POSIX.
         cross-device,
+        /// A catch-all for errors not captured by the existing variants.
+        /// Implementations can use this to extend the error type without
+        /// breaking existing code.
+        other(option<string>),
     }
 
     /// File or memory access pattern advisory information.