diff --git a/Cargo.lock b/Cargo.lock
index 75d8463e7..0a795c502 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -520,6 +520,9 @@ name = "bitflags"
 version = "2.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "630be753d4e58660abd17930c71b647fe46c27ea6b63cc59e1e3851406972e42"
+dependencies = [
+ "serde",
+]
 
 [[package]]
 name = "block-buffer"
@@ -1255,6 +1258,15 @@ dependencies = [
  "syn 2.0.28",
 ]
 
+[[package]]
+name = "doxygen-rs"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "415b6ec780d34dcf624666747194393603d0373b7141eef01d12ee58881507d9"
+dependencies = [
+ "phf",
+]
+
 [[package]]
 name = "dump"
 version = "1.5.0"
@@ -1811,36 +1823,35 @@ checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
 
 [[package]]
 name = "heed"
-version = "0.12.7"
-source = "git+https://github.com/meilisearch/heed?tag=v0.12.7#061a5276b1f336f5f3302bee291e336041d88632"
+version = "0.20.0-alpha.6"
+source = "git+https://github.com/meilisearch/heed?branch=put-current-with-data-codec#2824585c37a6c7c0c5d11fe13c0dad3ebb1a5c4f"
 dependencies = [
+ "bitflags 2.3.3",
+ "bytemuck",
  "byteorder",
  "heed-traits",
  "heed-types",
  "libc",
- "lmdb-rkv-sys",
+ "lmdb-master-sys",
  "once_cell",
- "page_size 0.4.2",
+ "page_size",
  "synchronoise",
  "url",
- "zerocopy",
 ]
 
 [[package]]
 name = "heed-traits"
-version = "0.7.0"
-source = "git+https://github.com/meilisearch/heed?tag=v0.12.7#061a5276b1f336f5f3302bee291e336041d88632"
+version = "0.20.0-alpha.6"
+source = "git+https://github.com/meilisearch/heed?branch=put-current-with-data-codec#2824585c37a6c7c0c5d11fe13c0dad3ebb1a5c4f"
 
 [[package]]
 name = "heed-types"
-version = "0.7.2"
-source = "git+https://github.com/meilisearch/heed?tag=v0.12.7#061a5276b1f336f5f3302bee291e336041d88632"
+version = "0.20.0-alpha.6"
+source = "git+https://github.com/meilisearch/heed?branch=put-current-with-data-codec#2824585c37a6c7c0c5d11fe13c0dad3ebb1a5c4f"
 dependencies = [
- "bincode",
+ "bytemuck",
+ "byteorder",
  "heed-traits",
- "serde",
- "serde_json",
- "zerocopy",
 ]
 
 [[package]]
@@ -2458,7 +2469,7 @@ dependencies = [
  "meilisearch-auth",
  "meilisearch-types",
  "nelson",
- "page_size 0.5.0",
+ "page_size",
  "puffin",
  "roaring",
  "serde",
@@ -2968,13 +2979,13 @@ dependencies = [
 ]
 
 [[package]]
-name = "lmdb-rkv-sys"
-version = "0.15.1"
-source = "git+https://github.com/meilisearch/lmdb-rs#501aa34a1ab7f092e3ff54a6c22ff6c55931a2d8"
+name = "lmdb-master-sys"
+version = "0.1.0"
+source = "git+https://github.com/meilisearch/heed?branch=put-current-with-data-codec#2824585c37a6c7c0c5d11fe13c0dad3ebb1a5c4f"
 dependencies = [
  "cc",
+ "doxygen-rs",
  "libc",
- "pkg-config",
 ]
 
 [[package]]
@@ -3470,16 +3481,6 @@ dependencies = [
  "num-traits",
 ]
 
-[[package]]
-name = "page_size"
-version = "0.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eebde548fbbf1ea81a99b128872779c437752fb99f217c45245e1a61dcd9edcd"
-dependencies = [
- "libc",
- "winapi",
-]
-
 [[package]]
 name = "page_size"
 version = "0.5.0"
@@ -3630,6 +3631,7 @@ version = "0.11.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ade2d8b8f33c7333b51bcf0428d37e217e9f32192ae4772156f65063b8ce03dc"
 dependencies = [
+ "phf_macros",
  "phf_shared",
 ]
 
@@ -3653,6 +3655,19 @@ dependencies = [
  "rand",
 ]
 
+[[package]]
+name = "phf_macros"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3444646e286606587e49f3bcf1679b8cef1dc2c5ecc29ddacaffc305180d464b"
+dependencies = [
+ "phf_generator",
+ "phf_shared",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.28",
+]
+
 [[package]]
 name = "phf_shared"
 version = "0.11.2"
@@ -4479,18 +4494,6 @@ dependencies = [
  "crossbeam-queue",
 ]
 
-[[package]]
-name = "synstructure"
-version = "0.12.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f36bdaa60a83aca3921b5259d5400cbf5e90fc51931376a9bd4a0eb79aa7210f"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 1.0.109",
- "unicode-xid",
-]
-
 [[package]]
 name = "synstructure"
 version = "0.13.0"
@@ -5359,28 +5362,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "syn 2.0.28",
- "synstructure 0.13.0",
-]
-
-[[package]]
-name = "zerocopy"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6580539ad917b7c026220c4b3f2c08d52ce54d6ce0dc491e66002e35388fab46"
-dependencies = [
- "byteorder",
- "zerocopy-derive",
-]
-
-[[package]]
-name = "zerocopy-derive"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d498dbd1fd7beb83c86709ae1c33ca50942889473473d287d56ce4770a18edfb"
-dependencies = [
- "proc-macro2",
- "syn 1.0.109",
- "synstructure 0.12.6",
+ "synstructure",
 ]
 
 [[package]]
@@ -5401,7 +5383,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "syn 2.0.28",
- "synstructure 0.13.0",
+ "synstructure",
 ]
 
 [[package]]
diff --git a/milli/Cargo.toml b/milli/Cargo.toml
index 1d8517e73..190c8e4e2 100644
--- a/milli/Cargo.toml
+++ b/milli/Cargo.toml
@@ -29,8 +29,8 @@ geoutils = "0.5.1"
 grenad = { version = "0.4.5", default-features = false, features = [
     "rayon", "tempfile"
 ] }
-heed = { git = "https://github.com/meilisearch/heed", tag = "v0.12.7", default-features = false, features = [
-    "lmdb", "read-txn-no-tls"
+heed = { git = "https://github.com/meilisearch/heed", branch = "put-current-with-data-codec", default-features = false, features = [
+    "read-txn-no-tls"
 ] }
 indexmap = { version = "2.0.0", features = ["serde"] }
 instant-distance = { version = "0.6.1", features = ["with-serde"] }