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-rw-r--r--pkgs/top-level/all-packages.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 2d55fee89f2..a7b78186e2c 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -3289,7 +3289,7 @@ let
 
   ocaml_make = callPackage ../development/ocaml-modules/ocamlmake { };
 
-  opa = let callPackage = newScope pkgs.ocamlPackages_3_12_1; in callPackage ../development/compilers/opa { };
+  opa = let callPackage = newScope pkgs.ocamlPackages_4_00_1; in callPackage ../development/compilers/opa { };
 
   ocamlnat = let callPackage = newScope pkgs.ocamlPackages_3_12_1; in callPackage ../development/ocaml-modules/ocamlnat { };