diff --git a/pkgs/development/ocaml-modules/git/paf.nix b/pkgs/development/ocaml-modules/git/paf.nix
index 55ab06726049..0867363720ca 100644
--- a/pkgs/development/ocaml-modules/git/paf.nix
+++ b/pkgs/development/ocaml-modules/git/paf.nix
@@ -23,6 +23,11 @@ buildDunePackage {
 
   inherit (git) version src;
 
+  postPatch = ''
+    substituteInPlace src/git-paf/dune --replace-fail bigstringaf 'bigstringaf bstr'
+    substituteInPlace src/git-paf/git_paf.ml --replace-fail Bigstringaf.t Bstr.t
+  '';
+
   minimalOCamlVersion = "4.08";
 
   propagatedBuildInputs = [
diff --git a/pkgs/development/ocaml-modules/h1/default.nix b/pkgs/development/ocaml-modules/h1/default.nix
index 0f7fdebff65c..aad1f760a65b 100644
--- a/pkgs/development/ocaml-modules/h1/default.nix
+++ b/pkgs/development/ocaml-modules/h1/default.nix
@@ -3,11 +3,12 @@
   buildDunePackage,
   fetchurl,
   angstrom,
-  bigstringaf,
+  base64,
+  bstr,
   faraday,
   httpun-types,
   alcotest,
-  version ? "1.0.0",
+  version ? "1.1.0",
 }:
 
 buildDunePackage {
@@ -17,12 +18,13 @@ buildDunePackage {
 
   src = fetchurl {
     url = "https://github.com/robur-coop/ocaml-h1/releases/download/v${version}/h1-${version}.tbz";
-    hash = "sha256-uFHRcNmfHiFmdMAMKiS5KilIwMylf/AoJCfxllrIvRM=";
+    hash = "sha256-LTBn7TgBY5IBSfvpFJ1b2mMLT0XjwQvnk77qBqB8bTw=";
   };
 
   propagatedBuildInputs = [
     angstrom
-    bigstringaf
+    base64
+    bstr
     faraday
     httpun-types
   ];