diff --git a/host_source.go b/host_source.go
index a0bab9ad0..eb1d8a72a 100644
--- a/host_source.go
+++ b/host_source.go
@@ -56,6 +56,7 @@ const (
 
 type cassVersion struct {
 	Major, Minor, Patch int
+	AdditionalNotation  string
 }
 
 func (c *cassVersion) Set(v string) error {
@@ -87,13 +88,29 @@ func (c *cassVersion) unmarshal(data []byte) error {
 
 	c.Minor, err = strconv.Atoi(v[1])
 	if err != nil {
-		return fmt.Errorf("invalid minor version %v: %v", v[1], err)
+		vMinor := strings.Split(v[1], "-")
+		if len(vMinor) < 2 {
+			return fmt.Errorf("invalid minor version %v: %v", v[1], err)
+		}
+		c.Minor, err = strconv.Atoi(vMinor[0])
+		if err != nil {
+			return fmt.Errorf("invalid minor version %v: %v", v[1], err)
+		}
+		c.AdditionalNotation = vMinor[1]
 	}
 
 	if len(v) > 2 {
 		c.Patch, err = strconv.Atoi(v[2])
 		if err != nil {
-			return fmt.Errorf("invalid patch version %v: %v", v[2], err)
+			vPatch := strings.Split(v[2], "-")
+			if len(vPatch) < 2 {
+				return fmt.Errorf("invalid patch version %v: %v", v[2], err)
+			}
+			c.Patch, err = strconv.Atoi(vPatch[0])
+			if err != nil {
+				return fmt.Errorf("invalid patch version %v: %v", v[2], err)
+			}
+			c.AdditionalNotation = vPatch[1]
 		}
 	}
 
@@ -121,6 +138,9 @@ func (c cassVersion) AtLeast(major, minor, patch int) bool {
 }
 
 func (c cassVersion) String() string {
+	if c.AdditionalNotation != "" {
+		return fmt.Sprintf("%d.%d.%d-%v", c.Major, c.Minor, c.Patch, c.AdditionalNotation)
+	}
 	return fmt.Sprintf("v%d.%d.%d", c.Major, c.Minor, c.Patch)
 }
 
diff --git a/host_source_test.go b/host_source_test.go
index 081384237..960f7322c 100644
--- a/host_source_test.go
+++ b/host_source_test.go
@@ -29,6 +29,7 @@ package gocql
 
 import (
 	"errors"
+	"fmt"
 	"net"
 	"sync"
 	"sync/atomic"
@@ -41,9 +42,11 @@ func TestUnmarshalCassVersion(t *testing.T) {
 		data    string
 		version cassVersion
 	}{
-		{"3.2", cassVersion{3, 2, 0}},
-		{"2.10.1-SNAPSHOT", cassVersion{2, 10, 1}},
-		{"1.2.3", cassVersion{1, 2, 3}},
+		{"3.2", cassVersion{3, 2, 0, ""}},
+		{"2.10.1-SNAPSHOT", cassVersion{2, 10, 1, ""}},
+		{"1.2.3", cassVersion{1, 2, 3, ""}},
+		{"4.0-rc2", cassVersion{4, 0, 0, "rc2"}},
+		{"4.3.2-rc1", cassVersion{4, 3, 2, "rc1"}},
 	}
 
 	for i, test := range tests {
@@ -53,6 +56,7 @@ func TestUnmarshalCassVersion(t *testing.T) {
 		} else if *v != test.version {
 			t.Errorf("%d: expected %#+v got %#+v", i, test.version, *v)
 		}
+		fmt.Println(v.String())
 	}
 }
 
@@ -60,14 +64,17 @@ func TestCassVersionBefore(t *testing.T) {
 	tests := [...]struct {
 		version             cassVersion
 		major, minor, patch int
+		AdditionalNotation  string
 	}{
-		{cassVersion{1, 0, 0}, 0, 0, 0},
-		{cassVersion{0, 1, 0}, 0, 0, 0},
-		{cassVersion{0, 0, 1}, 0, 0, 0},
+		{cassVersion{1, 0, 0, ""}, 0, 0, 0, ""},
+		{cassVersion{0, 1, 0, ""}, 0, 0, 0, ""},
+		{cassVersion{0, 0, 1, ""}, 0, 0, 0, ""},
 
-		{cassVersion{1, 0, 0}, 0, 1, 0},
-		{cassVersion{0, 1, 0}, 0, 0, 1},
-		{cassVersion{4, 1, 0}, 3, 1, 2},
+		{cassVersion{1, 0, 0, ""}, 0, 1, 0, ""},
+		{cassVersion{0, 1, 0, ""}, 0, 0, 1, ""},
+		{cassVersion{4, 1, 0, ""}, 3, 1, 2, ""},
+
+		{cassVersion{4, 1, 0, ""}, 3, 1, 2, ""},
 	}
 
 	for i, test := range tests {