diff --git a/pkgs/applications/science/medicine/dcmtk/default.nix b/pkgs/applications/science/medicine/dcmtk/default.nix
index 0312043306a..8a06260ebc7 100644
--- a/pkgs/applications/science/medicine/dcmtk/default.nix
+++ b/pkgs/applications/science/medicine/dcmtk/default.nix
@@ -3,12 +3,12 @@
 with lib;
 stdenv.mkDerivation rec {
   pname = "dcmtk";
-  version = "3.6.5";
+  version = "3.6.6";
   src = fetchFromGitHub {
     owner = "DCMTK";
     repo = pname;
     rev = "DCMTK-${version}";
-    sha256 = "0i38k1s0wdpbxxpiwsx490mszhxi45wp0z67iksvh60wfkaw54na";
+    sha256 = "sha256-bpvf2JJXikV/CqmXZb3w4Ua3VBEQcQk7PXw9ie0t8xo=";
   };
 
   nativeBuildInputs = [ cmake ];