diff --git a/pkgs/by-name/da/davmail/package.nix b/pkgs/by-name/da/davmail/package.nix
index c4f3f442cdaa..064a1292194c 100644
--- a/pkgs/by-name/da/davmail/package.nix
+++ b/pkgs/by-name/da/davmail/package.nix
@@ -17,17 +17,17 @@
 }:
 
 let
-  rev = 3627;
+  rev = 3755;
   jre' = (if preferZulu then zulu11 else jdk11).override { enableJavaFX = true; };
   gtk' = if preferGtk3 then gtk3 else gtk2;
 in
 stdenv.mkDerivation rec {
   pname = "davmail";
-  version = "6.3.0";
+  version = "6.4.0";
 
   src = fetchzip {
     url = "mirror://sourceforge/${pname}/${version}/${pname}-${version}-${toString rev}.zip";
-    hash = "sha256-zJMwCFX/uJnLeThj6/t2usBRM+LIuamZt0EFLG3N+8k=";
+    hash = "sha256-cGuAxSIkhkcpRXlv5f3utH/1zZ1aYbLQN/OLuN80JdM=";
     stripRoot = false;
   };