diff --git a/choirMail.cabal b/choirMail.cabal
index 1faf38c..74671e4 100644
--- a/choirMail.cabal
+++ b/choirMail.cabal
@@ -76,7 +76,7 @@ executable choirMail
 
     -- Other library packages from which modules are imported.
     -- ^>=4.15.1.0
-    build-depends:    base >=4.15.1.0 && < 4.18
+    build-depends:    base >=4.15.1.0 && < 4.19
                       ,transformers
                       ,tomland >= 1.3.3.0
                       ,smtp-mail
diff --git a/flake.lock b/flake.lock
index 505f2ae..c8aedb6 100644
--- a/flake.lock
+++ b/flake.lock
@@ -5,11 +5,11 @@
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1692799911,
-        "narHash": "sha256-3eihraek4qL744EvQXsK1Ha6C3CR7nnT8X2qWap4RNk=",
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "f9e7cf818399d17d347f847525c5a5a8032e4e44",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
         "type": "github"
       },
       "original": {
@@ -20,11 +20,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1693355128,
-        "narHash": "sha256-+ZoAny3ZxLcfMaUoLVgL9Ywb/57wP+EtsdNGuXUJrwg=",
+        "lastModified": 1712192574,
+        "narHash": "sha256-LbbVOliJKTF4Zl2b9salumvdMXuQBr2kuKP5+ZwbYq4=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "a63a64b593dcf2fe05f7c5d666eb395950f36bc9",
+        "rev": "f480f9d09e4b4cf87ee6151eba068197125714de",
         "type": "github"
       },
       "original": {