diff --git a/pkgs/development/libraries/libdap/default.nix b/pkgs/development/libraries/libdap/default.nix
index df2e4c367bfb..baf938944201 100644
--- a/pkgs/development/libraries/libdap/default.nix
+++ b/pkgs/development/libraries/libdap/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl, bison, libuuid, curl, libxml2, flex }:
 
 stdenv.mkDerivation rec {
-  version = "3.20.4";
+  version = "3.20.5";
   pname = "libdap";
 
   nativeBuildInputs = [ bison flex ];
@@ -9,7 +9,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "https://www.opendap.org/pub/source/${pname}-${version}.tar.gz";
-    sha256 = "0x44igs389b49nb2psd656wpvmbx9bwmla2l5ahfa09vxb314s5i";
+    sha256 = "17j6ca2qsp69a91lm11mwbs4l8q13xqcdz60l94avl5krymrqg47";
   };
 
   meta = with stdenv.lib; {