diff --git a/go.mod b/go.mod
index d7fce88..e095c52 100644
--- a/go.mod
+++ b/go.mod
@@ -3,6 +3,7 @@ module github.com/zondax/rosetta-filecoin-proxy
 go 1.16
 
 require (
+	github.com/Masterminds/semver v1.5.0
 	github.com/coinbase/rosetta-sdk-go v0.6.10
 	github.com/filecoin-project/go-address v0.0.5
 	github.com/filecoin-project/go-bitfield v0.2.4
diff --git a/go.sum b/go.sum
index 005c02f..316dfde 100644
--- a/go.sum
+++ b/go.sum
@@ -56,6 +56,8 @@ github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go
 github.com/Kubuxu/go-os-helper v0.0.1/go.mod h1:N8B+I7vPCT80IcP58r50u4+gEEcsZETFUpAzWW2ep1Y=
 github.com/Masterminds/glide v0.13.2/go.mod h1:STyF5vcenH/rUqTEv+/hBXlSTo7KYwg2oc2f4tzPWic=
 github.com/Masterminds/semver v1.4.2/go.mod h1:MB6lktGJrhw8PrUyiEoblNEGEQ+RzHPF078ddwwvV3Y=
+github.com/Masterminds/semver v1.5.0 h1:H65muMkzWKEuNDnfl9d70GUjFniHKHRbFPGBuZ3QEww=
+github.com/Masterminds/semver v1.5.0/go.mod h1:MB6lktGJrhw8PrUyiEoblNEGEQ+RzHPF078ddwwvV3Y=
 github.com/Masterminds/vcs v1.13.0/go.mod h1:N09YCmOQr6RLxC6UNHzuVwAdodYbbnycGHSmwVJjcKA=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
diff --git a/main.go b/main.go
index d9af059..3b4fa4f 100644
--- a/main.go
+++ b/main.go
@@ -2,14 +2,17 @@ package main
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"net/http"
 	"os"
 	"os/signal"
 	"strconv"
+	"strings"
 	"syscall"
 	"time"
 
+	"github.com/Masterminds/semver"
 	rosettaAsserter "github.com/coinbase/rosetta-sdk-go/asserter"
 	"github.com/coinbase/rosetta-sdk-go/server"
 	"github.com/coinbase/rosetta-sdk-go/types"
@@ -151,6 +154,19 @@ func connectAPI(addr string, token string) (api.FullNode, jsonrpc.ClientCloser,
 
 	srv.Logger.Info("Connected to Lotus version: ", version.String())
 
+	c, _ := semver.NewConstraint(">= 1.5")
+
+	semverString := strings.Split(version.String(), "+")[0]
+	v, err := semver.NewVersion(semverString)
+	if err != nil {
+		srv.Logger.Warn("Not a standard semver version. Unable to verify if this Lotus version is compatible with proxy.")
+		return nil, nil, errors.New("Not standard semver version sent by Lotus.")
+	}
+
+	if !c.Check(v) {
+		srv.Logger.Fatal("Lotus version should be 1.5 or higher.")
+	}
+
 	return lotusAPI, clientCloser, nil
 }