diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ab93efad..430af618 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,6 +22,9 @@ jobs:
           override: true
           components: rustfmt, clippy
 
+      - name: Install Protoc
+        uses: arduino/setup-protoc@v2
+
       # `cargo check` command here will use installed `nightly`
       # as it is set as an "override" for current directory
 
@@ -75,6 +78,9 @@ jobs:
           override: true
           components: rustfmt, clippy
 
+      - name: Install Protoc
+        uses: arduino/setup-protoc@v2
+
       # `cargo check` command here will use installed `nightly`
       # as it is set as an "override" for current directory
 
diff --git a/src/storage/mod.rs b/src/storage/mod.rs
index b27feecc..ac561151 100644
--- a/src/storage/mod.rs
+++ b/src/storage/mod.rs
@@ -8,7 +8,6 @@ use crate::storage::table_codec::TableCodec;
 use crate::types::errors::TypeError;
 use crate::types::index::{Index, IndexMetaRef};
 use crate::types::tuple::{Tuple, TupleId};
-use kip_db::error::CacheError;
 use kip_db::kernel::lsm::mvcc;
 use kip_db::KernelError;
 use std::collections::VecDeque;
@@ -147,9 +146,6 @@ pub enum StorageError {
     #[error("kipdb error")]
     KipDBError(KernelError),
 
-    #[error("cache error")]
-    CacheError(CacheError),
-
     #[error("type error")]
     TypeError(#[from] TypeError),
 
@@ -168,9 +164,3 @@ impl From<KernelError> for StorageError {
         StorageError::KipDBError(value)
     }
 }
-
-impl From<CacheError> for StorageError {
-    fn from(value: CacheError) -> Self {
-        StorageError::CacheError(value)
-    }
-}