diff --git a/go.mod b/go.mod
index 72cfefc7e6..b678a7e7ba 100644
--- a/go.mod
+++ b/go.mod
@@ -27,7 +27,7 @@ require (
 	github.com/gorilla/mux v1.8.1
 	github.com/grafana/regexp v0.0.0-20240518133315-a468a5bfb3bc
 	github.com/grpc-ecosystem/go-grpc-middleware v1.4.0
-	github.com/hashicorp/consul/api v1.30.0
+	github.com/hashicorp/consul/api v1.31.0
 	github.com/hashicorp/go-cleanhttp v0.5.2
 	github.com/hashicorp/go-sockaddr v1.0.7
 	github.com/hashicorp/memberlist v0.5.1
diff --git a/go.sum b/go.sum
index 88485cf722..866d42b1ad 100644
--- a/go.sum
+++ b/go.sum
@@ -1262,8 +1262,8 @@ github.com/grpc-ecosystem/grpc-gateway/v2 v2.16.0/go.mod h1:YN5jB8ie0yfIUg6VvR9K
 github.com/grpc-ecosystem/grpc-gateway/v2 v2.24.0 h1:TmHmbvxPmaegwhDubVz0lICL0J5Ka2vwTzhoePEXsGE=
 github.com/grpc-ecosystem/grpc-gateway/v2 v2.24.0/go.mod h1:qztMSjm835F2bXf+5HKAPIS5qsmQDqZna/PgVt4rWtI=
 github.com/hashicorp/consul/api v1.12.0/go.mod h1:6pVBMo0ebnYdt2S3H87XhekM/HHrUoTD2XXb/VrZVy0=
-github.com/hashicorp/consul/api v1.30.0 h1:ArHVMMILb1nQv8vZSGIwwQd2gtc+oSQZ6CalyiyH2XQ=
-github.com/hashicorp/consul/api v1.30.0/go.mod h1:B2uGchvaXVW2JhFoS8nqTxMD5PBykr4ebY4JWHTTeLM=
+github.com/hashicorp/consul/api v1.31.0 h1:32BUNLembeSRek0G/ZAM6WNfdEwYdYo8oQ4+JoqGkNQ=
+github.com/hashicorp/consul/api v1.31.0/go.mod h1:2ZGIiXM3A610NmDULmCHd/aqBJj8CkMfOhswhOafxRg=
 github.com/hashicorp/consul/sdk v0.8.0/go.mod h1:GBvyrGALthsZObzUGsfgHZQDXjg4lOjagTIwIR1vPms=
 github.com/hashicorp/consul/sdk v0.16.1 h1:V8TxTnImoPD5cj0U9Spl0TUxcytjcbbJeADFF07KdHg=
 github.com/hashicorp/consul/sdk v0.16.1/go.mod h1:fSXvwxB2hmh1FMZCNl6PwX0Q/1wdWtHJcZ7Ea5tns0s=
diff --git a/vendor/github.com/hashicorp/consul/api/api.go b/vendor/github.com/hashicorp/consul/api/api.go
index d4d853d5d4..27af1ea569 100644
--- a/vendor/github.com/hashicorp/consul/api/api.go
+++ b/vendor/github.com/hashicorp/consul/api/api.go
@@ -1087,8 +1087,23 @@ func (c *Client) doRequest(r *request) (time.Duration, *http.Response, error) {
 	if err != nil {
 		return 0, nil, err
 	}
+
+	contentType := GetContentType(req)
+
+	if req != nil {
+		req.Header.Set(contentTypeHeader, contentType)
+	}
+
 	start := time.Now()
 	resp, err := c.config.HttpClient.Do(req)
+
+	if resp != nil {
+		respContentType := resp.Header.Get(contentTypeHeader)
+		if respContentType == "" || respContentType != contentType {
+			resp.Header.Set(contentTypeHeader, contentType)
+		}
+	}
+
 	diff := time.Since(start)
 	return diff, resp, err
 }
diff --git a/vendor/github.com/hashicorp/consul/api/content_type.go b/vendor/github.com/hashicorp/consul/api/content_type.go
new file mode 100644
index 0000000000..37c8cf60aa
--- /dev/null
+++ b/vendor/github.com/hashicorp/consul/api/content_type.go
@@ -0,0 +1,81 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+package api
+
+import (
+	"net/http"
+	"strings"
+)
+
+const (
+	contentTypeHeader = "Content-Type"
+	plainContentType  = "text/plain; charset=utf-8"
+	octetStream       = "application/octet-stream"
+	jsonContentType   = "application/json" // Default content type
+)
+
+// ContentTypeRule defines a rule for determining the content type of an HTTP request.
+// This rule is based on the combination of the HTTP path, method, and the desired content type.
+type ContentTypeRule struct {
+	path        string
+	httpMethod  string
+	contentType string
+}
+
+var ContentTypeRules = []ContentTypeRule{
+	{
+		path:        "/v1/snapshot",
+		httpMethod:  http.MethodPut,
+		contentType: octetStream,
+	},
+	{
+		path:        "/v1/kv",
+		httpMethod:  http.MethodPut,
+		contentType: octetStream,
+	},
+	{
+		path:        "/v1/event/fire",
+		httpMethod:  http.MethodPut,
+		contentType: octetStream,
+	},
+}
+
+// GetContentType returns the content type for a request
+// This function isused as routing logic or middleware to determine and enforce
+// the appropriate content type for HTTP requests.
+func GetContentType(req *http.Request) string {
+	reqContentType := req.Header.Get(contentTypeHeader)
+
+	if isIndexPage(req) {
+		return plainContentType
+	}
+
+	// For GET, DELETE, or internal API paths, ensure a valid Content-Type is returned.
+	if req.Method == http.MethodGet || req.Method == http.MethodDelete || strings.HasPrefix(req.URL.Path, "/v1/internal") {
+		if reqContentType == "" {
+			// Default to JSON Content-Type if no Content-Type is provided.
+			return jsonContentType
+		}
+		// Return the provided Content-Type if it exists.
+		return reqContentType
+	}
+
+	for _, rule := range ContentTypeRules {
+		if matchesRule(req, rule) {
+			return rule.contentType
+		}
+	}
+	return jsonContentType
+}
+
+// matchesRule checks if a request matches a content type rule
+func matchesRule(req *http.Request, rule ContentTypeRule) bool {
+	return strings.HasPrefix(req.URL.Path, rule.path) &&
+		(rule.httpMethod == "" || req.Method == rule.httpMethod)
+}
+
+// isIndexPage checks if the request is for the index page
+func isIndexPage(req *http.Request) bool {
+	return req.URL.Path == "/" || req.URL.Path == "/ui"
+}
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 4035c28b7d..7d17aceab0 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -556,7 +556,7 @@ github.com/grpc-ecosystem/go-grpc-middleware/v2
 github.com/grpc-ecosystem/grpc-gateway/v2/internal/httprule
 github.com/grpc-ecosystem/grpc-gateway/v2/runtime
 github.com/grpc-ecosystem/grpc-gateway/v2/utilities
-# github.com/hashicorp/consul/api v1.30.0
+# github.com/hashicorp/consul/api v1.31.0
 ## explicit; go 1.19
 github.com/hashicorp/consul/api
 # github.com/hashicorp/errwrap v1.1.0