diff --git a/CLAUDE.md b/CLAUDE.md
index c260fbf..51e6d6f 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -34,7 +34,7 @@ Domain-based packaging under `internal/` — each domain owns its models, store
 | `internal/checkin` | Check-in / check-out and history |
 | `internal/notification` | Per-volunteer notifications |
 | `internal/auth` | JWT issuance (`auth.Service`) and `HashPassword` |
-| `internal/db` | SQLite open + one-shot schema migration (`db.Migrate`) |
+| `internal/db` | MySQL open + one-shot schema migration (`db.Migrate`) |
 | `internal/respond` | `respond.JSON` / `respond.Error` helpers |
 | `internal/server` | Wires all handlers into a chi router; serves static files at `/` |
 | `internal/server/middleware` | `Authenticate` (JWT) and `RequireAdmin` middleware; `ClaimsFromContext` |
diff --git a/go.mod b/go.mod
index 16f20fb..3d0a973 100644
--- a/go.mod
+++ b/go.mod
@@ -4,7 +4,9 @@ go 1.25.0
 
 require (
 	github.com/go-chi/chi/v5 v5.2.5
-	github.com/go-sql-driver/mysql v1.8.1
+	github.com/go-sql-driver/mysql v1.9.3
 	github.com/golang-jwt/jwt/v5 v5.3.1
 	golang.org/x/crypto v0.48.0
 )
+
+require filippo.io/edwards25519 v1.1.0 // indirect
diff --git a/go.sum b/go.sum
index ad82b06..2cb7171 100644
--- a/go.sum
+++ b/go.sum
@@ -1,7 +1,11 @@
+filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
+filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
 github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
 github.com/go-chi/chi/v5 v5.2.5 h1:Eg4myHZBjyvJmAFjFvWgrqDTXFyOzjj7YIm3L3mu6Ug=
 github.com/go-chi/chi/v5 v5.2.5/go.mod h1:X7Gx4mteadT3eDOMTsXzmI4/rwUpOwBHLpAfupzFJP0=
+github.com/go-sql-driver/mysql v1.9.3 h1:U/N249h2WzJ3Ukj8SowVFjdtZKfu9vlLZxjPXV1aweo=
+github.com/go-sql-driver/mysql v1.9.3/go.mod h1:qn46aNg1333BRMNU69Lq93t8du/dwxI64Gl8i5p1WMU=
 github.com/golang-jwt/jwt/v5 v5.3.1 h1:kYf81DTWFe7t+1VvL7eS+jKFVWaUnK9cB1qbwn63YCY=
 github.com/golang-jwt/jwt/v5 v5.3.1/go.mod h1:fxCRLWMO43lRc8nhHWY6LGqRcf+1gQWArsqaEUEa5bE=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=