diff --git a/pkgs/development/libraries/wt/default.nix b/pkgs/development/libraries/wt/default.nix
index 934369ac8e8..8b92e78d2bd 100644
--- a/pkgs/development/libraries/wt/default.nix
+++ b/pkgs/development/libraries/wt/default.nix
@@ -50,7 +50,7 @@ in {
   };
 
   wt4 = generic {
-    version = "4.6.1";
-    sha256 = "04pv4kb8d576bfnd9kjc3cfjls9cm3cgpaiabwb3iyq9z0w585gh";
+    version = "4.9.1";
+    sha256 = "sha256-Qm0qqYB/CLVHUgKE9N83MgAWQ2YFdumrB0i84qYNto8=";
   };
 }