diff --git a/pkg/api/http_client.go b/pkg/api/http_client.go
index 39efa82..399b3a5 100644
--- a/pkg/api/http_client.go
+++ b/pkg/api/http_client.go
@@ -93,7 +93,6 @@ func NewHTTPClient(opts ClientOptions) (*http.Client, error) {
 			IdleConnTimeout:       90 * time.Second,
 			TLSHandshakeTimeout:   10 * time.Second,
 			ResponseHeaderTimeout: 30 * time.Second,
-			ExpectContinueTimeout: 1 * time.Second,
 			ForceAttemptHTTP2:     true,
 			DisableCompression:    true,
 		},
diff --git a/pkg/pm/registry/client.go b/pkg/pm/registry/client.go
index 29af688..3593177 100644
--- a/pkg/pm/registry/client.go
+++ b/pkg/pm/registry/client.go
@@ -15,7 +15,6 @@ import (
 )
 
 const (
-	continue100              = "100-continue"
 	maxManifestSize          = 256 * 1024 // 256KB
 	contentTypeOctetStream   = "application/octet-stream"
 	wpmContentTypeManifestV1 = "application/vnd.wpm.install-v1+json"
@@ -87,7 +86,6 @@ func (c *client) PutPackage(ctx context.Context, data *manifest.Package, tarball
 		"/"+data.Name+"/"+data.Version,
 		bodyReader,
 		nil,
-		api.WithHeader(api.HeaderExpect, continue100),
 		api.WithHeader(api.HeaderContentType, contentTypeOctetStream),
 		api.WithContentLength(totalContentLength),
 	)