diff --git a/migrations/V25__wasm_fuel_limit_bump.sql b/migrations/V25__wasm_fuel_limit_bump.sql
new file mode 100644
index 0000000000..a6fe61a12c
--- /dev/null
+++ b/migrations/V25__wasm_fuel_limit_bump.sql
@@ -0,0 +1,7 @@
+-- The code default for wasm.default_fuel_limit was bumped from 10M to 500M
+-- (limits.rs, config/wasm.rs), but databases that persisted the old 10M value
+-- in the settings table still read it back at startup (DB-first resolution).
+-- Delete the stale row so the code default takes effect.
+DELETE FROM settings
+WHERE key = 'wasm.default_fuel_limit'
+  AND (value#>>'{}')::BIGINT = 10000000;
diff --git a/migrations/checksums.lock b/migrations/checksums.lock
index c699f5b9b5..d3547a8796 100644
--- a/migrations/checksums.lock
+++ b/migrations/checksums.lock
@@ -37,3 +37,4 @@ V21__backfill_conversation_source_channel = 4041142068103384561
 V22__sandbox_restart_params = 12611649486554869350
 V23__list_workspace_files_escape_like = 12519024535161914473
 V24__llm_calls_created_at_index = 2650126284755685421
+V25__wasm_fuel_limit_bump = 8924323300096627270
diff --git a/src/db/libsql_migrations.rs b/src/db/libsql_migrations.rs
index 354cfe50a8..27bff085af 100644
--- a/src/db/libsql_migrations.rs
+++ b/src/db/libsql_migrations.rs
@@ -990,6 +990,21 @@ ALTER TABLE agent_jobs ADD COLUMN restart_params TEXT;
         "llm_calls_created_at_index",
         r#"
 CREATE INDEX IF NOT EXISTS idx_llm_calls_created_at ON llm_calls(created_at);
+"#,
+    ),
+    (
+        25,
+        "wasm_fuel_limit_bump",
+        // The code default for wasm.default_fuel_limit was bumped from 10M to
+        // 500M (limits.rs, config/wasm.rs), but databases that persisted the
+        // old 10M value in the settings table still read it back at startup
+        // (DB-first resolution). Delete the stale row so the code default
+        // takes effect; users who intentionally lowered the limit can re-set
+        // it via the settings API.
+        r#"
+DELETE FROM settings
+WHERE key = 'wasm.default_fuel_limit'
+  AND CAST(json_extract(value, '$') AS INTEGER) = 10000000;
 "#,
     ),
 ];