diff --git a/pkgs/development/ocaml-modules/javalib/default.nix b/pkgs/development/ocaml-modules/javalib/default.nix
index a12ade51c2ea..5675e10dbad1 100644
--- a/pkgs/development/ocaml-modules/javalib/default.nix
+++ b/pkgs/development/ocaml-modules/javalib/default.nix
@@ -8,19 +8,18 @@
 , extlib
 }:
 
-if lib.versionOlder ocaml.version "4.04"
-then throw "javalib is not available for OCaml ${ocaml.version}"
-else
+lib.throwIfNot (lib.versionAtLeast ocaml.version "4.08")
+  "javalib is not available for OCaml ${ocaml.version}"
 
 stdenv.mkDerivation rec {
   pname = "ocaml${ocaml.version}-javalib";
-  version = "3.2.1";
+  version = "3.2.2";
 
   src = fetchFromGitHub {
     owner = "javalib-team";
     repo = "javalib";
-    rev = "v${version}";
-    sha256 = "sha256-du1h+S+A7CetMXofsYxdGeSsobCgspDB9oUE9WNUbbo=";
+    rev = version;
+    hash = "sha256-XaI7GTU/O5UEWuYX4yqaIRmEoH7FuvCg/+gtKbE/P1s=";
   };
 
   nativeBuildInputs = [ which ocaml findlib ];
diff --git a/pkgs/development/ocaml-modules/sawja/default.nix b/pkgs/development/ocaml-modules/sawja/default.nix
index 78d28270035a..a5d042fc1907 100644
--- a/pkgs/development/ocaml-modules/sawja/default.nix
+++ b/pkgs/development/ocaml-modules/sawja/default.nix
@@ -2,12 +2,11 @@
 
 let
   pname = "sawja";
-  version = "1.5.11";
+  version = "1.5.12";
 in
 
-if lib.versionOlder ocaml.version "4.07"
-then throw "${pname} is not available for OCaml ${ocaml.version}"
-else
+lib.throwIfNot (lib.versionAtLeast ocaml.version "4.08")
+  "${pname} is not available for OCaml ${ocaml.version}"
 
 stdenv.mkDerivation {
 
@@ -19,7 +18,7 @@ stdenv.mkDerivation {
     owner = "javalib-team";
     repo = pname;
     rev = version;
-    sha256 = "sha256-1aKkRZDuLJLmDhUC1FXnn4QrgXaTyAbnXfTOAdnKgs8=";
+    hash = "sha256-G1W8/G0TEcldnFnH/NAb9a6ZSGGP2fWTM47lI8bBHnw=";
   };
 
   nativeBuildInputs = [ which ocaml findlib ];