diff --git a/pkgs/applications/science/logic/z3/default.nix b/pkgs/applications/science/logic/z3/default.nix
index 9ede6a922da6..b247599a0813 100644
--- a/pkgs/applications/science/logic/z3/default.nix
+++ b/pkgs/applications/science/logic/z3/default.nix
@@ -89,8 +89,8 @@ let common = { version, sha256, patches ? [ ], tag ? "z3" }:
 in
 {
   z3_4_12 = common {
-    version = "4.12.4";
-    sha256 = "sha256-cxl7D47dRn+uMVOHbF0avj5+ZFWjaJ7lXj/8l6r9q2I=";
+    version = "4.12.5";
+    sha256 = "sha256-Qj9w5s02OSMQ2qA7HG7xNqQGaUacA1d4zbOHynq5k+A=";
   };
   z3_4_11 = common {
     version = "4.11.2";