diff --git a/src/bin/dolos/doctor/rebuild_ledger.rs b/src/bin/dolos/doctor/rebuild_ledger.rs
index 3a2a2173..1f8fdabe 100644
--- a/src/bin/dolos/doctor/rebuild_ledger.rs
+++ b/src/bin/dolos/doctor/rebuild_ledger.rs
@@ -26,7 +26,7 @@ pub fn run(config: &crate::Config, _args: &Args, feedback: &Feedback) -> miette:
         .into_diagnostic()
         .context("creating in-memory state store")?;
 
-    let mut light = dolos::state::LedgerStore::Redb(light);
+    let light = dolos::state::LedgerStore::Redb(light);
 
     if light
         .is_empty()
@@ -81,7 +81,7 @@ pub fn run(config: &crate::Config, _args: &Args, feedback: &Feedback) -> miette:
             .into_diagnostic()
             .context("decoding blocks")?;
 
-        dolos::state::apply_block_batch(&blocks, &mut light, &genesis)
+        dolos::state::apply_block_batch(&blocks, &light, &genesis)
             .into_diagnostic()
             .context("importing blocks to ledger store")?;
 
diff --git a/src/mempool.rs b/src/mempool.rs
index 9ac60fd2..0003998a 100644
--- a/src/mempool.rs
+++ b/src/mempool.rs
@@ -211,7 +211,7 @@ impl Mempool {
         }
     }
 
-    pub fn apply_block(&mut self, block: &MultiEraBlock) {
+    pub fn apply_block(&self, block: &MultiEraBlock) {
         let mut state = self.mempool.write().unwrap();
 
         if state.acknowledged.is_empty() {
@@ -229,7 +229,7 @@ impl Mempool {
         }
     }
 
-    pub fn undo_block(&mut self, block: &MultiEraBlock) {
+    pub fn undo_block(&self, block: &MultiEraBlock) {
         let mut state = self.mempool.write().unwrap();
 
         if state.acknowledged.is_empty() {
diff --git a/src/state/mod.rs b/src/state/mod.rs
index 3d2cf59b..a0e00972 100644
--- a/src/state/mod.rs
+++ b/src/state/mod.rs
@@ -121,13 +121,13 @@ impl LedgerStore {
         }
     }
 
-    pub fn apply(&mut self, deltas: &[LedgerDelta]) -> Result<(), LedgerError> {
+    pub fn apply(&self, deltas: &[LedgerDelta]) -> Result<(), LedgerError> {
         match self {
             LedgerStore::Redb(x) => x.apply(deltas),
         }
     }
 
-    pub fn finalize(&mut self, until: BlockSlot) -> Result<(), LedgerError> {
+    pub fn finalize(&self, until: BlockSlot) -> Result<(), LedgerError> {
         match self {
             LedgerStore::Redb(x) => x.finalize(until),
         }
@@ -215,7 +215,7 @@ pub fn load_slice_for_block(
 
 pub fn apply_block_batch<'a>(
     blocks: impl IntoIterator<Item = &'a MultiEraBlock<'a>>,
-    store: &mut LedgerStore,
+    store: &LedgerStore,
     genesis: &Genesis,
 ) -> Result<(), LedgerError> {
     let mut deltas: Vec<LedgerDelta> = vec![];
diff --git a/src/state/redb/mod.rs b/src/state/redb/mod.rs
index dd8ea95e..e64842b2 100644
--- a/src/state/redb/mod.rs
+++ b/src/state/redb/mod.rs
@@ -239,7 +239,7 @@ impl LedgerStore {
         }
     }
 
-    pub fn apply(&mut self, deltas: &[LedgerDelta]) -> Result<(), LedgerError> {
+    pub fn apply(&self, deltas: &[LedgerDelta]) -> Result<(), LedgerError> {
         match self {
             LedgerStore::SchemaV1(x) => Ok(x.apply(deltas)?),
             LedgerStore::SchemaV2(x) => Ok(x.apply(deltas)?),
@@ -247,7 +247,7 @@ impl LedgerStore {
         }
     }
 
-    pub fn finalize(&mut self, until: BlockSlot) -> Result<(), LedgerError> {
+    pub fn finalize(&self, until: BlockSlot) -> Result<(), LedgerError> {
         match self {
             LedgerStore::SchemaV1(x) => Ok(x.finalize(until)?),
             LedgerStore::SchemaV2(x) => Ok(x.finalize(until)?),
diff --git a/src/state/redb/v1.rs b/src/state/redb/v1.rs
index 4d326d56..fd38f833 100644
--- a/src/state/redb/v1.rs
+++ b/src/state/redb/v1.rs
@@ -41,7 +41,7 @@ impl LedgerStore {
         tables::BlocksTable::last(&rx)
     }
 
-    pub fn apply(&mut self, deltas: &[LedgerDelta]) -> Result<(), Error> {
+    pub fn apply(&self, deltas: &[LedgerDelta]) -> Result<(), Error> {
         let mut wx = self.db().begin_write()?;
         wx.set_durability(Durability::Eventual);
 
@@ -57,7 +57,7 @@ impl LedgerStore {
         Ok(())
     }
 
-    pub fn finalize(&mut self, until: BlockSlot) -> Result<(), Error> {
+    pub fn finalize(&self, until: BlockSlot) -> Result<(), Error> {
         let rx = self.db().begin_read()?;
         let tss = tables::TombstonesTable::get_range(&rx, until)?;
 
diff --git a/src/state/redb/v2.rs b/src/state/redb/v2.rs
index 8cdb69c6..de0d697d 100644
--- a/src/state/redb/v2.rs
+++ b/src/state/redb/v2.rs
@@ -48,7 +48,7 @@ impl LedgerStore {
         Ok(last)
     }
 
-    pub fn apply(&mut self, deltas: &[LedgerDelta]) -> Result<(), Error> {
+    pub fn apply(&self, deltas: &[LedgerDelta]) -> Result<(), Error> {
         let mut wx = self.db().begin_write()?;
         wx.set_durability(Durability::Eventual);
 
@@ -64,7 +64,7 @@ impl LedgerStore {
         Ok(())
     }
 
-    pub fn finalize(&mut self, until: BlockSlot) -> Result<(), Error> {
+    pub fn finalize(&self, until: BlockSlot) -> Result<(), Error> {
         let rx = self.db().begin_read()?;
         let cursors = tables::CursorTable::get_range(&rx, until)?;
 
diff --git a/src/state/redb/v2light.rs b/src/state/redb/v2light.rs
index d31071b8..59eed722 100644
--- a/src/state/redb/v2light.rs
+++ b/src/state/redb/v2light.rs
@@ -48,7 +48,7 @@ impl LedgerStore {
         Ok(last)
     }
 
-    pub fn apply(&mut self, deltas: &[LedgerDelta]) -> Result<(), Error> {
+    pub fn apply(&self, deltas: &[LedgerDelta]) -> Result<(), Error> {
         let mut wx = self.db().begin_write()?;
         wx.set_durability(Durability::Eventual);
 
@@ -63,7 +63,7 @@ impl LedgerStore {
         Ok(())
     }
 
-    pub fn finalize(&mut self, until: BlockSlot) -> Result<(), Error> {
+    pub fn finalize(&self, until: BlockSlot) -> Result<(), Error> {
         let rx = self.db().begin_read()?;
         let cursors = tables::CursorTable::get_range(&rx, until)?;