diff --git a/pkgs/development/libraries/aqbanking/gwenhywfar.nix b/pkgs/development/libraries/aqbanking/gwenhywfar.nix
index 28039cc0168..77a5a09da43 100644
--- a/pkgs/development/libraries/aqbanking/gwenhywfar.nix
+++ b/pkgs/development/libraries/aqbanking/gwenhywfar.nix
@@ -6,13 +6,14 @@
   ]
 }:
 
-stdenv.mkDerivation rec {
+let
+  inherit ((import ./sources.nix).gwenhywfar) sha256 releaseId version;
+in stdenv.mkDerivation rec {
   name = "gwenhywfar-${version}";
-  version = "4.15.3";
+  inherit version;
 
   src = let
-    inherit ((import ./sources.nix).gwenhywfar) sha256 releaseId;
-    qstring = "package=01&release=${releaseId}&file=01";
+    qstring = "package=01&release=${releaseId}&file=02";
     mkURLs = map (base: "${base}/sites/download/download.php?${qstring}");
   in fetchurl {
     name = "${name}.tar.gz";
diff --git a/pkgs/development/libraries/aqbanking/sources.nix b/pkgs/development/libraries/aqbanking/sources.nix
index 1638c72e95f..ab69240f621 100644
--- a/pkgs/development/libraries/aqbanking/sources.nix
+++ b/pkgs/development/libraries/aqbanking/sources.nix
@@ -1,8 +1,8 @@
 # This file is autogenerated from update.sh in the same directory.
 {
-  gwenhywfar.version = "4.17.0";
-  gwenhywfar.sha256 = "1z9bm2r407x8vxk2nk6pndx0zhlk32j65z472ljkgjbh56mgzz8i";
-  gwenhywfar.releaseId = "205";
+  gwenhywfar.version = "4.20.0";
+  gwenhywfar.sha256 = "1c0g3f8jk6j693774ifslx2ds4ksabgbbalhhm9gk20kpamxm22s";
+  gwenhywfar.releaseId = "208";
   libchipcard.version = "5.0.4";
   libchipcard.sha256 = "0fj2h39ll4kiv28ch8qgzdbdbnzs8gl812qnm660bw89rynpjnnj";
   libchipcard.releaseId = "200";