diff --git a/manifest.dhall b/manifest.dhall
index ec9ac18c0a78c44827d64f20856d1ec05e83b3bf..8e39e05eef169e8e14fe1ca98a6268774095cc09 100644
--- a/manifest.dhall
+++ b/manifest.dhall
@@ -76,6 +76,7 @@ in  [ callHackage "Cabal" "3.8.1.0"
     , callHackage "ansi-terminal" "0.11.3"
     , callHackage "ansi-wl-pprint" "0.6.9"
     , callHackage "apecs" "0.9.4"
+    , callHackage "asn1-encoding" "0.9.6"
     , callHackage "asn1-types" "0.3.4"
     , callHackage "assoc" "1.0.2"
     , callHackage "async" "2.2.4"
diff --git a/overlay.nix b/overlay.nix
index 6370781013a873a9dbdec5d891d4fadbe00f9890..9f5b428b268249b6c06989337f4568249bc050c9 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -35,6 +35,8 @@ final: prev: with pkgs.haskell.lib; {
 
   apecs = prev.callPackage (./pkgs/apecs.nix) { };
 
+  asn1-encoding = prev.callPackage (./pkgs/asn1-encoding.nix) { };
+
   asn1-types = prev.callPackage (./pkgs/asn1-types.nix) { };
 
   assoc = prev.callPackage (./pkgs/assoc.nix) { };
diff --git a/pkgs/asn1-encoding.nix b/pkgs/asn1-encoding.nix
new file mode 100644
index 0000000000000000000000000000000000000000..f543ece3ef826a1a48c24627becd5e4f41c9ba51
--- /dev/null
+++ b/pkgs/asn1-encoding.nix
@@ -0,0 +1,41 @@
+{ mkDerivation
+, asn1-types
+, base
+, bytestring
+, hourglass
+, lib
+, mtl
+, tasty
+, tasty-quickcheck
+}:
+mkDerivation {
+  pname = "asn1-encoding";
+  version = "0.9.6";
+  sha256 = "d9f8deabd3b908e5cf83c0d813c08dc0143b3ec1c0d97f660d2cfa02c1c8da0a";
+  revision = "2";
+  editedCabalFile = "16503ryhq15f2rfdav2qnkq11dg2r3vk3f9v64q9dmxf8dh8zv97";
+  isLibrary = true;
+  isExecutable = false;
+  enableSeparateDataOutput = false;
+  libraryHaskellDepends = [ asn1-types base bytestring hourglass ];
+  testHaskellDepends = [
+    asn1-types
+    base
+    bytestring
+    hourglass
+    mtl
+    tasty
+    tasty-quickcheck
+  ];
+  enableLibraryProfiling = false;
+  enableExecutableProfiling = false;
+  doHaddock = false;
+  jailbreak = true;
+  doCheck = false;
+  doBenchmark = false;
+  hyperlinkSource = false;
+  homepage = "https://github.com/vincenthz/hs-asn1";
+  description = "ASN1 data reader and writer in RAW, BER and DER forms";
+  license = lib.licenses.bsd3;
+  broken = false;
+}