diff --git a/crates/meilitool/src/main.rs b/crates/meilitool/src/main.rs
index 1da846ac3..dd1213782 100644
--- a/crates/meilitool/src/main.rs
+++ b/crates/meilitool/src/main.rs
@@ -11,7 +11,7 @@ use meilisearch_auth::{open_auth_store_env, AuthController};
 use meilisearch_types::batches::Batch;
 use meilisearch_types::heed::types::{Bytes, SerdeJson, Str};
 use meilisearch_types::heed::{
-    CompactionOption, Database, Env, EnvOpenOptions, RoTxn, RwTxn, TlsUsage, Unspecified,
+    CompactionOption, Database, Env, EnvOpenOptions, RoTxn, RwTxn, Unspecified, WithoutTls,
 };
 use meilisearch_types::milli::constants::RESERVED_VECTORS_FIELD_NAME;
 use meilisearch_types::milli::documents::{obkv_to_object, DocumentsBatchReader};
@@ -172,7 +172,7 @@ fn main() -> anyhow::Result<()> {
 /// Clears the task queue located at `db_path`.
 fn clear_task_queue(db_path: PathBuf) -> anyhow::Result<()> {
     let path = db_path.join("tasks");
-    let env = unsafe { EnvOpenOptions::new().max_dbs(100).open(&path) }
+    let env = unsafe { EnvOpenOptions::new().read_txn_without_tls().max_dbs(100).open(&path) }
         .with_context(|| format!("While trying to open {:?}", path.display()))?;
 
     eprintln!("Deleting tasks from the database...");
@@ -224,8 +224,8 @@ fn clear_task_queue(db_path: PathBuf) -> anyhow::Result<()> {
     Ok(())
 }
 
-fn try_opening_database<KC: 'static, DC: 'static, T: TlsUsage>(
-    env: &Env<T>,
+fn try_opening_database<KC: 'static, DC: 'static>(
+    env: &Env<WithoutTls>,
     rtxn: &RoTxn,
     db_name: &str,
 ) -> anyhow::Result<Database<KC, DC>> {
@@ -234,8 +234,8 @@ fn try_opening_database<KC: 'static, DC: 'static, T: TlsUsage>(
         .with_context(|| format!("Missing the {db_name:?} database"))
 }
 
-fn try_opening_poly_database<T: TlsUsage>(
-    env: &Env<T>,
+fn try_opening_poly_database(
+    env: &Env<WithoutTls>,
     rtxn: &RoTxn,
     db_name: &str,
 ) -> anyhow::Result<Database<Unspecified, Unspecified>> {
@@ -284,8 +284,10 @@ fn export_a_dump(
         FileStore::new(db_path.join("update_files")).context("While opening the FileStore")?;
 
     let index_scheduler_path = db_path.join("tasks");
-    let env = unsafe { EnvOpenOptions::new().max_dbs(100).open(&index_scheduler_path) }
-        .with_context(|| format!("While trying to open {:?}", index_scheduler_path.display()))?;
+    let env = unsafe {
+        EnvOpenOptions::new().read_txn_without_tls().max_dbs(100).open(&index_scheduler_path)
+    }
+    .with_context(|| format!("While trying to open {:?}", index_scheduler_path.display()))?;
 
     eprintln!("Dumping the keys...");
 
@@ -442,8 +444,10 @@ fn export_a_dump(
 
 fn compact_index(db_path: PathBuf, index_name: &str) -> anyhow::Result<()> {
     let index_scheduler_path = db_path.join("tasks");
-    let env = unsafe { EnvOpenOptions::new().max_dbs(100).open(&index_scheduler_path) }
-        .with_context(|| format!("While trying to open {:?}", index_scheduler_path.display()))?;
+    let env = unsafe {
+        EnvOpenOptions::new().read_txn_without_tls().max_dbs(100).open(&index_scheduler_path)
+    }
+    .with_context(|| format!("While trying to open {:?}", index_scheduler_path.display()))?;
 
     let rtxn = env.read_txn()?;
     let index_mapping: Database<Str, UuidCodec> =
@@ -519,8 +523,10 @@ fn export_documents(
     offset: Option<usize>,
 ) -> anyhow::Result<()> {
     let index_scheduler_path = db_path.join("tasks");
-    let env = unsafe { EnvOpenOptions::new().max_dbs(100).open(&index_scheduler_path) }
-        .with_context(|| format!("While trying to open {:?}", index_scheduler_path.display()))?;
+    let env = unsafe {
+        EnvOpenOptions::new().read_txn_without_tls().max_dbs(100).open(&index_scheduler_path)
+    }
+    .with_context(|| format!("While trying to open {:?}", index_scheduler_path.display()))?;
 
     let rtxn = env.read_txn()?;
     let index_mapping: Database<Str, UuidCodec> =
@@ -622,8 +628,10 @@ fn hair_dryer(
     index_parts: &[IndexPart],
 ) -> anyhow::Result<()> {
     let index_scheduler_path = db_path.join("tasks");
-    let env = unsafe { EnvOpenOptions::new().max_dbs(100).open(&index_scheduler_path) }
-        .with_context(|| format!("While trying to open {:?}", index_scheduler_path.display()))?;
+    let env = unsafe {
+        EnvOpenOptions::new().read_txn_without_tls().max_dbs(100).open(&index_scheduler_path)
+    }
+    .with_context(|| format!("While trying to open {:?}", index_scheduler_path.display()))?;
 
     eprintln!("Trying to get a read transaction on the index scheduler...");
 
diff --git a/crates/meilitool/src/upgrade/v1_10.rs b/crates/meilitool/src/upgrade/v1_10.rs
index 54fd01ac1..ac30055c5 100644
--- a/crates/meilitool/src/upgrade/v1_10.rs
+++ b/crates/meilitool/src/upgrade/v1_10.rs
@@ -2,7 +2,9 @@ use std::path::Path;
 
 use anyhow::{bail, Context};
 use meilisearch_types::heed::types::{SerdeJson, Str};
-use meilisearch_types::heed::{Database, Env, EnvOpenOptions, RoTxn, RwTxn, TlsUsage, Unspecified};
+use meilisearch_types::heed::{
+    Database, Env, EnvOpenOptions, RoTxn, RwTxn, Unspecified, WithoutTls,
+};
 use meilisearch_types::milli::index::{db_name, main_key};
 
 use super::v1_9;
@@ -90,9 +92,9 @@ fn update_index_stats(
     Ok(())
 }
 
-fn update_date_format<T: TlsUsage>(
+fn update_date_format(
     index_uid: &str,
-    index_env: &Env<T>,
+    index_env: &Env<WithoutTls>,
     index_wtxn: &mut RwTxn,
 ) -> anyhow::Result<()> {
     let main = try_opening_poly_database(index_env, index_wtxn, db_name::MAIN)
@@ -104,9 +106,9 @@ fn update_date_format<T: TlsUsage>(
     Ok(())
 }
 
-fn find_rest_embedders<T: TlsUsage>(
+fn find_rest_embedders(
     index_uid: &str,
-    index_env: &Env<T>,
+    index_env: &Env<WithoutTls>,
     index_txn: &RoTxn,
 ) -> anyhow::Result<Vec<String>> {
     let main = try_opening_poly_database(index_env, index_txn, db_name::MAIN)
@@ -164,8 +166,10 @@ pub fn v1_9_to_v1_10(
     // 2. REST embedders. We don't support this case right now, so bail
 
     let index_scheduler_path = db_path.join("tasks");
-    let env = unsafe { EnvOpenOptions::new().max_dbs(100).open(&index_scheduler_path) }
-        .with_context(|| format!("While trying to open {:?}", index_scheduler_path.display()))?;
+    let env = unsafe {
+        EnvOpenOptions::new().read_txn_without_tls().max_dbs(100).open(&index_scheduler_path)
+    }
+    .with_context(|| format!("While trying to open {:?}", index_scheduler_path.display()))?;
 
     let mut sched_wtxn = env.write_txn()?;
 
@@ -205,9 +209,13 @@ pub fn v1_9_to_v1_10(
 
         let index_env = unsafe {
             // FIXME: fetch the 25 magic number from the index file
-            EnvOpenOptions::new().max_dbs(25).open(&index_path).with_context(|| {
-                format!("while opening index {uid} at '{}'", index_path.display())
-            })?
+            EnvOpenOptions::new()
+                .read_txn_without_tls()
+                .max_dbs(25)
+                .open(&index_path)
+                .with_context(|| {
+                    format!("while opening index {uid} at '{}'", index_path.display())
+                })?
         };
 
         let index_txn = index_env.read_txn().with_context(|| {
@@ -252,9 +260,13 @@ pub fn v1_9_to_v1_10(
 
         let index_env = unsafe {
             // FIXME: fetch the 25 magic number from the index file
-            EnvOpenOptions::new().max_dbs(25).open(&index_path).with_context(|| {
-                format!("while opening index {uid} at '{}'", index_path.display())
-            })?
+            EnvOpenOptions::new()
+                .read_txn_without_tls()
+                .max_dbs(25)
+                .open(&index_path)
+                .with_context(|| {
+                    format!("while opening index {uid} at '{}'", index_path.display())
+                })?
         };
 
         let mut index_wtxn = index_env.write_txn().with_context(|| {
diff --git a/crates/meilitool/src/upgrade/v1_11.rs b/crates/meilitool/src/upgrade/v1_11.rs
index 8b653a55e..76d2fc24f 100644
--- a/crates/meilitool/src/upgrade/v1_11.rs
+++ b/crates/meilitool/src/upgrade/v1_11.rs
@@ -23,8 +23,10 @@ pub fn v1_10_to_v1_11(
     println!("Upgrading from v1.10.0 to v1.11.0");
 
     let index_scheduler_path = db_path.join("tasks");
-    let env = unsafe { EnvOpenOptions::new().max_dbs(100).open(&index_scheduler_path) }
-        .with_context(|| format!("While trying to open {:?}", index_scheduler_path.display()))?;
+    let env = unsafe {
+        EnvOpenOptions::new().read_txn_without_tls().max_dbs(100).open(&index_scheduler_path)
+    }
+    .with_context(|| format!("While trying to open {:?}", index_scheduler_path.display()))?;
 
     let sched_rtxn = env.read_txn()?;
 
@@ -50,9 +52,13 @@ pub fn v1_10_to_v1_11(
         );
 
         let index_env = unsafe {
-            EnvOpenOptions::new().max_dbs(25).open(&index_path).with_context(|| {
-                format!("while opening index {uid} at '{}'", index_path.display())
-            })?
+            EnvOpenOptions::new()
+                .read_txn_without_tls()
+                .max_dbs(25)
+                .open(&index_path)
+                .with_context(|| {
+                    format!("while opening index {uid} at '{}'", index_path.display())
+                })?
         };
 
         let index_rtxn = index_env.read_txn().with_context(|| {
diff --git a/crates/meilitool/src/upgrade/v1_12.rs b/crates/meilitool/src/upgrade/v1_12.rs
index 54fbe0c8b..1dd679eb9 100644
--- a/crates/meilitool/src/upgrade/v1_12.rs
+++ b/crates/meilitool/src/upgrade/v1_12.rs
@@ -115,8 +115,10 @@ fn convert_update_files(db_path: &Path) -> anyhow::Result<()> {
 /// Rebuild field distribution as it was wrongly computed in v1.12.x if x < 3
 fn rebuild_field_distribution(db_path: &Path) -> anyhow::Result<()> {
     let index_scheduler_path = db_path.join("tasks");
-    let env = unsafe { EnvOpenOptions::new().max_dbs(100).open(&index_scheduler_path) }
-        .with_context(|| format!("While trying to open {:?}", index_scheduler_path.display()))?;
+    let env = unsafe {
+        EnvOpenOptions::new().read_txn_without_tls().max_dbs(100).open(&index_scheduler_path)
+    }
+    .with_context(|| format!("While trying to open {:?}", index_scheduler_path.display()))?;
 
     let mut sched_wtxn = env.write_txn()?;