diff --git a/.github/config/.codespellignore b/.github/config/.codespellignore
new file mode 100644
index 0000000..a08537a
--- /dev/null
+++ b/.github/config/.codespellignore
@@ -0,0 +1,11 @@
+cips
+pullrequest
+keypair
+pastTime
+hasTables
+Nam
+EyT
+upTo
+initia
+minitia
+expRes
diff --git a/.github/workflows/spellcheck.yml b/.github/workflows/spellcheck.yml
new file mode 100644
index 0000000..3c9e159
--- /dev/null
+++ b/.github/workflows/spellcheck.yml
@@ -0,0 +1,28 @@
+name: Spell Check
+
+on:
+  pull_request:
+
+jobs:
+  spellcheck:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Run codespell
+        continue-on-error: true
+        run: |
+          sudo apt-get install codespell -y
+          codespell -w --skip="*.pulsar.go,*.pb.go,*.pb.gw.go,*.cosmos_orm.go,*.json,*.git,*.js,crypto/keys,fuzz,*.h,proto/tendermint,*.bin,go.sum,go.work.sum,go.mod,statik.go,*.map,swagger.yaml" --ignore-words=.github/config/.codespellignore
+      - uses: peter-evans/create-pull-request@v7.0.5
+        if: github.event_name != 'pull_request'
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          commit-message: "chore: fix typos"
+          title: "chore: fix typos"
+          branch: "chore/fix-typos"
+          delete-branch: true
+          body: |
+            This PR fixes typos in the codebase.
+            Please review it, and merge if everything is fine.
+            If there are proto changes, run `make proto-gen` and commit the changes.
diff --git a/api/opinit/ophost/v1/types.pulsar.go b/api/opinit/ophost/v1/types.pulsar.go
index 182e055..0d6de0d 100644
--- a/api/opinit/ophost/v1/types.pulsar.go
+++ b/api/opinit/ophost/v1/types.pulsar.go
@@ -3582,7 +3582,7 @@ type BridgeConfig struct {
 	// The time interval at which checkpoints must be submitted.
 	// NOTE: this param is currently not used, but will be used for challenge in future.
 	SubmissionInterval *durationpb.Duration `protobuf:"bytes,4,opt,name=submission_interval,json=submissionInterval,proto3" json:"submission_interval,omitempty"`
-	// The minium time duration that must elapse before a withdrawal can be finalized.
+	// The minimum time duration that must elapse before a withdrawal can be finalized.
 	FinalizationPeriod *durationpb.Duration `protobuf:"bytes,5,opt,name=finalization_period,json=finalizationPeriod,proto3" json:"finalization_period,omitempty"`
 	// The the first l2 block will be recorded on l1.
 	SubmissionStartHeight uint64 `protobuf:"varint,6,opt,name=submission_start_height,json=submissionStartHeight,proto3" json:"submission_start_height,omitempty"`
diff --git a/contrib/launchtools/config.go b/contrib/launchtools/config.go
index e9d699b..6f412e7 100644
--- a/contrib/launchtools/config.go
+++ b/contrib/launchtools/config.go
@@ -251,8 +251,8 @@ func (l1config *L1Config) Finalize(buf *bufio.Reader) error {
 
 	if l1config.RPC_URL == "" {
 		defaultRPC := fmt.Sprintf("https://rpc.%s.initia.xyz:443", l1config.ChainID)
-		promt := fmt.Sprintf("Use default L1 rpc [%s]?", defaultRPC)
-		useDefault, err := input.GetConfirmation(promt, buf, os.Stderr)
+		prompt := fmt.Sprintf("Use default L1 rpc [%s]?", defaultRPC)
+		useDefault, err := input.GetConfirmation(prompt, buf, os.Stderr)
 		if err != nil {
 			return err
 		}
diff --git a/contrib/launchtools/steps/ibc.go b/contrib/launchtools/steps/ibc.go
index e83c054..e349f4c 100644
--- a/contrib/launchtools/steps/ibc.go
+++ b/contrib/launchtools/steps/ibc.go
@@ -82,7 +82,7 @@ func initializeConfig(r *Relayer) error {
 }
 
 // initializeChains creates chain configuration files and initializes chains for the relayer
-// "chains" in cosmos/relayer lingo means srcChain and dstChain. Speficic ports are not created here.
+// "chains" in cosmos/relayer lingo means srcChain and dstChain. Specific ports are not created here.
 // see initializePaths.
 func initializeChains(config *launchtools.Config, basePath string) func(*Relayer) error {
 	// ChainConfig is a struct that represents the configuration of a chain
diff --git a/proto/opinit/ophost/v1/types.proto b/proto/opinit/ophost/v1/types.proto
index affeee1..08a462d 100644
--- a/proto/opinit/ophost/v1/types.proto
+++ b/proto/opinit/ophost/v1/types.proto
@@ -45,7 +45,7 @@ message BridgeConfig {
     (gogoproto.nullable) = false,
     (amino.dont_omitempty) = true
   ];
-  // The minium time duration that must elapse before a withdrawal can be finalized.
+  // The minimum time duration that must elapse before a withdrawal can be finalized.
   google.protobuf.Duration finalization_period = 5 [
     (gogoproto.stdduration) = true,
     (gogoproto.jsontag) = "finalization_period,omitempty",
diff --git a/specs/l2_output_oracle.md b/specs/l2_output_oracle.md
index d8f4f93..5c7620a 100644
--- a/specs/l2_output_oracle.md
+++ b/specs/l2_output_oracle.md
@@ -10,7 +10,7 @@ The first version of the implementation does not include a dispute system, but u
 
 L2 output oracle receives `output_root` with L2 block number to check the checkpoint of L2. The checkpoints are the multiple of `submission_interval`. A proposer must submit the `output_root` at the every checkpoints.
 
-The followings are the components of `output_root`.
+The following are the components of `output_root`.
 
 - `version`: the version of output root
 - `state_root`: l2 state root
diff --git a/x/opchild/keeper/msg_server.go b/x/opchild/keeper/msg_server.go
index b220a5b..575a425 100644
--- a/x/opchild/keeper/msg_server.go
+++ b/x/opchild/keeper/msg_server.go
@@ -406,7 +406,7 @@ func (ms MsgServer) FinalizeTokenDeposit(ctx context.Context, req *types.MsgFina
 		depositSuccess, reason = ms.safeDepositToken(ctx, toAddr, sdk.NewCoins(coin))
 	}
 
-	// updae l1 sequence
+	// update l1 sequence
 	if _, err := ms.IncreaseNextL1Sequence(ctx); err != nil {
 		return nil, err
 	}
@@ -459,7 +459,7 @@ func (ms MsgServer) FinalizeTokenDeposit(ctx context.Context, req *types.MsgFina
 	// emit deposit event
 	sdkCtx.EventManager().EmitEvent(event)
 
-	// if the deposit is failed, initate a withdrawal
+	// if the deposit is failed, initiate a withdrawal
 	if !depositSuccess || !hookSuccess {
 		if depositSuccess {
 			// reclaim and burn coins
diff --git a/x/opchild/types/errors.go b/x/opchild/types/errors.go
index 7f486a6..57be19a 100644
--- a/x/opchild/types/errors.go
+++ b/x/opchild/types/errors.go
@@ -19,7 +19,7 @@ var (
 	ErrZeroMaxValidators               = errorsmod.Register(ModuleName, 12, "max validators must be non-zero")
 	ErrInvalidExecuteMsg               = errorsmod.Register(ModuleName, 13, "invalid execute message")
 	ErrUnroutableExecuteMsg            = errorsmod.Register(ModuleName, 14, "unroutable execute message")
-	ErrInvalidExecutorChangePlan       = errorsmod.Register(ModuleName, 15, "invalid executor chane plan")
+	ErrInvalidExecutorChangePlan       = errorsmod.Register(ModuleName, 15, "invalid executor change plan")
 	ErrAlreadyRegisteredHeight         = errorsmod.Register(ModuleName, 16, "executor change plan already exists at the height")
 	ErrInvalidBridgeInfo               = errorsmod.Register(ModuleName, 17, "invalid bridge info")
 	ErrInvalidHeight                   = errorsmod.Register(ModuleName, 18, "invalid oracle height")
diff --git a/x/ophost/keeper/msg_server.go b/x/ophost/keeper/msg_server.go
index b530dc9..ef3ec42 100644
--- a/x/ophost/keeper/msg_server.go
+++ b/x/ophost/keeper/msg_server.go
@@ -183,7 +183,7 @@ func (ms MsgServer) DeleteOutput(ctx context.Context, req *types.MsgDeleteOutput
 		return nil, err
 	}
 
-	// gov, current propoer or current challenger can delete output.
+	// gov, current proper or current challenger can delete output.
 	if ms.authority != challenger && bridgeConfig.Proposer != challenger && bridgeConfig.Challenger != challenger {
 		return nil, errors.ErrUnauthorized.Wrapf("invalid challenger; expected %s, %s or %s, got %s", ms.authority, bridgeConfig.Proposer, bridgeConfig.Challenger, challenger)
 	}
diff --git a/x/ophost/types/types.pb.go b/x/ophost/types/types.pb.go
index dcfc7c7..62bfb01 100644
--- a/x/ophost/types/types.pb.go
+++ b/x/ophost/types/types.pb.go
@@ -114,7 +114,7 @@ type BridgeConfig struct {
 	// The time interval at which checkpoints must be submitted.
 	// NOTE: this param is currently not used, but will be used for challenge in future.
 	SubmissionInterval time.Duration `protobuf:"bytes,4,opt,name=submission_interval,json=submissionInterval,proto3,stdduration" json:"submission_interval,omitempty"`
-	// The minium time duration that must elapse before a withdrawal can be finalized.
+	// The minimum time duration that must elapse before a withdrawal can be finalized.
 	FinalizationPeriod time.Duration `protobuf:"bytes,5,opt,name=finalization_period,json=finalizationPeriod,proto3,stdduration" json:"finalization_period,omitempty"`
 	// The the first l2 block will be recorded on l1.
 	SubmissionStartHeight uint64 `protobuf:"varint,6,opt,name=submission_start_height,json=submissionStartHeight,proto3" json:"submission_start_height,omitempty"`