diff --git a/app/src/main/kotlin/com/wbrawner/twigs/server/Application.kt b/app/src/main/kotlin/com/wbrawner/twigs/server/Application.kt
index 631b7cb..f3ecb2b 100644
--- a/app/src/main/kotlin/com/wbrawner/twigs/server/Application.kt
+++ b/app/src/main/kotlin/com/wbrawner/twigs/server/Application.kt
@@ -208,6 +208,7 @@ fun Application.moduleWithDependencies(
             }
             cookie.httpOnly = true
             cookie.secure = true
+            cookie.extensions["SameSite"] = "Strict"
         }
     }
     install(ContentNegotiation) {