diff --git a/choirMail.cabal b/choirMail.cabal
index a2b5e09..1faf38c 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
+    build-depends:    base >=4.15.1.0 && < 4.18
                       ,transformers
                       ,tomland >= 1.3.3.0
                       ,smtp-mail
diff --git a/default.nix b/default.nix
index 5a7b90a..c1f84eb 100644
--- a/default.nix
+++ b/default.nix
@@ -1,2 +1,2 @@
-{ pkgs , compiler ? "ghc902"}:
-  pkgs.haskell.packages.${compiler}.callPackage ./choirMail.nix { }
+{ pkgs }:
+  pkgs.haskellPackages.callPackage ./choirMail.nix { }
diff --git a/flake.nix b/flake.nix
index 3c351e7..0d3fe28 100644
--- a/flake.nix
+++ b/flake.nix
@@ -10,15 +10,16 @@
   let
     # name to be used as identifier for editor environments and such
     name = "Application";
-    compiler = "ghc902";
+    # compiler = "ghc902";
 
   in
   flake-utils.lib.eachDefaultSystem ( system:
     let
       pkgs = import nixpkgs {inherit system;};
-      hpkgs = pkgs.haskell.packages.${compiler};
+      # hpkgs = pkgs.haskell.packages.${compiler};
+      hpkgs = pkgs.haskellPackages;
     in {
-      packages = { default = (import ./default.nix) {inherit pkgs compiler;};};
+      packages = { default = (import ./default.nix) {inherit pkgs;};};
 
     
       devShells =