diff --git a/pkgs/development/interpreters/tcl/8.6.nix b/pkgs/development/interpreters/tcl/8.6.nix
index d76ceb3421de..37a7fee8a859 100644
--- a/pkgs/development/interpreters/tcl/8.6.nix
+++ b/pkgs/development/interpreters/tcl/8.6.nix
@@ -2,10 +2,10 @@
 
 callPackage ./generic.nix (args // rec {
   release = "8.6";
-  version = "${release}.9";
+  version = "${release}.11";
 
   src = fetchurl {
     url = "mirror://sourceforge/tcl/tcl${version}-src.tar.gz";
-    sha256 = "0kjzj7mkzfnb7ksxanbibibfpciyvsh5ffdlhs0bmfc75kgd435d";
+    sha256 = "0n4211j80mxr6ql0xx52rig8r885rcbminfpjdb2qrw6hmk8c14c";
   };
 })