diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 44811d2..94b63bc 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,7 +11,7 @@ jobs:
       matrix:
         # support two latest major versions of Go, following the Go security policy
         # in which these versions get security updates. See https://golang.org/security
-        go-version: [1.20.x, 1.21.x]
+        go-version: [1.24.x, 1.25.x]
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v3
diff --git a/Dockerfile b/Dockerfile
index 8d842ed..95947bc 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.21.1-alpine3.18 AS builder
+FROM golang:1.25-alpine AS builder
 
 RUN apk update && apk add --no-cache git
 
@@ -8,7 +8,7 @@ RUN go get ./
 RUN CGO_ENABLED=0 go build -o /app/http-mockery
 RUN chmod +x /app/http-mockery
 
-FROM alpine:3.18
+FROM alpine:3.23
 
 COPY --from=builder /app/http-mockery /go/bin/http-mockery
 RUN apk update && apk add --no-cache ca-certificates
diff --git a/go.mod b/go.mod
index 0c5fd58..27ae0ad 100644
--- a/go.mod
+++ b/go.mod
@@ -1,9 +1,9 @@
 module github.com/UpCloudLtd/http-mockery
 
-go 1.21
+go 1.24
 
 require (
-	github.com/stretchr/testify v1.8.4
+	github.com/stretchr/testify v1.11.1
 	github.com/valyala/fasttemplate v1.2.2
 )
 
diff --git a/go.sum b/go.sum
index 803650f..45c15b1 100644
--- a/go.sum
+++ b/go.sum
@@ -2,8 +2,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
-github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
+github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
 github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6KllzawFIhcdPw=
 github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
 github.com/valyala/fasttemplate v1.2.2 h1:lxLXG0uE3Qnshl9QyaK6XJxMXlQZELvChBOCmQD0Loo=
diff --git a/pkg/mockery/mockery.go b/pkg/mockery/mockery.go
index 8247eb7..b2b5893 100644
--- a/pkg/mockery/mockery.go
+++ b/pkg/mockery/mockery.go
@@ -18,11 +18,9 @@ import (
 	"github.com/valyala/fasttemplate"
 )
 
-var (
-	ErrEndpointNotFound = fmt.Errorf("no matching endpoint found")
-)
+var ErrEndpointNotFound = fmt.Errorf("no matching endpoint found")
 
-var validHTTPMethods = []string{http.MethodGet, http.MethodPost, http.MethodPut, http.MethodPost, http.MethodDelete}
+var validHTTPMethods = []string{http.MethodGet, http.MethodPost, http.MethodPut, http.MethodDelete, http.MethodPatch}
 
 const (
 	EndpointTypeNormal = "normal"
@@ -91,7 +89,7 @@ func (s MockHandler) ValidateConfig() error {
 			}
 		}
 		if !validMethod {
-			return fmt.Errorf(fmt.Sprintf("Invalid HTTP method (%s) for endpoint %s. Allowed: %+v", endpoint.Method, endpoint.Uri, validHTTPMethods))
+			return fmt.Errorf("invalid HTTP method (%s) for endpoint %s. Allowed: %+v", endpoint.Method, endpoint.Uri, validHTTPMethods)
 		}
 
 		validType := false
@@ -102,7 +100,7 @@ func (s MockHandler) ValidateConfig() error {
 			}
 		}
 		if !validType {
-			return fmt.Errorf(fmt.Sprintf("Invalid endpoint type (%s) for endpoint %s. Allowed: %+v", endpoint.Type, endpoint.Uri, validEndpointTypes))
+			return fmt.Errorf("invalid endpoint type (%s) for endpoint %s. Allowed: %+v", endpoint.Type, endpoint.Uri, validEndpointTypes)
 		}
 
 		if endpoint.Template != "" {
diff --git a/pkg/mockery/mockery_test.go b/pkg/mockery/mockery_test.go
index 761f660..bf926a7 100644
--- a/pkg/mockery/mockery_test.go
+++ b/pkg/mockery/mockery_test.go
@@ -75,7 +75,7 @@ func TestConfigValidation(t *testing.T) {
 
 	testMocker.Config.Endpoints[0].Method = "TRACE"
 	err = testMocker.ValidateConfig()
-	assert.ErrorContains(t, err, "Invalid HTTP method", "Config validation should fail on unsupported HTTP method")
+	assert.ErrorContains(t, err, "invalid HTTP method", "Config validation should fail on unsupported HTTP method")
 	testMocker.Config = testingConfig()
 
 	testMocker.Config.Endpoints[0].ResponseCode = 0