diff --git a/olp-cpp-sdk-core/include/olp/core/http/NetworkProxySettings.h b/olp-cpp-sdk-core/include/olp/core/http/NetworkProxySettings.h
index ee2ba6f17..5c32915a5 100644
--- a/olp-cpp-sdk-core/include/olp/core/http/NetworkProxySettings.h
+++ b/olp-cpp-sdk-core/include/olp/core/http/NetworkProxySettings.h
@@ -35,12 +35,12 @@ class CORE_API NetworkProxySettings final {
  public:
   /// The proxy type.
   enum class Type {
-    NONE,             ///< Don't use the proxy.
-    HTTP,             ///< HTTP proxy as in https://www.ietf.org/rfc/rfc2068.txt
-    HTTPS,            ///< HTTPS proxy as in https://www.ietf.org/rfc/rfc2818.txt
-    SOCKS4,           ///< SOCKS4 proxy.
-    SOCKS4A,          ///< SOCKS4a proxy. Proxy resolves the URL hostname.
-    SOCKS5,           ///< SOCKS5 proxy.
+    NONE,     ///< Don't use the proxy.
+    HTTP,     ///< HTTP proxy as in https://www.ietf.org/rfc/rfc2068.txt
+    HTTPS,    ///< HTTPS proxy as in https://www.ietf.org/rfc/rfc2818.txt
+    SOCKS4,   ///< SOCKS4 proxy.
+    SOCKS4A,  ///< SOCKS4a proxy. Proxy resolves the URL hostname.
+    SOCKS5,   ///< SOCKS5 proxy.
     SOCKS5_HOSTNAME,  ///< SOCKS5 Proxy. Proxy resolves the URL hostname.
   };
 
@@ -124,6 +124,28 @@ class CORE_API NetworkProxySettings final {
    */
   NetworkProxySettings& WithPassword(std::string password);
 
+  /**
+   * @brief Gets the HTTPS proxy CA certificate blob.
+   *
+   * @return The PEM-encoded CA certificates used to verify the TLS
+   * certificate presented by an HTTPS proxy.
+   */
+  const std::string& GetCaInfoBlob() const;
+
+  /**
+   * @brief Sets the HTTPS proxy CA certificate blob.
+   *
+   * The blob contains PEM-encoded CA certificates used only to verify the TLS
+   * certificate presented by an HTTPS proxy. It corresponds to libcurl
+   * `CURLOPT_PROXY_CAINFO_BLOB` and is distinct from origin-server certificate
+   * settings.
+   *
+   * @param[in] ca_info_blob The PEM-encoded HTTPS proxy CA certificates.
+   *
+   * @return A reference to *this.
+   */
+  NetworkProxySettings& WithCaInfoBlob(std::string ca_info_blob);
+
  private:
   /// The proxy type.
   Type type_{Type::NONE};
@@ -135,6 +157,8 @@ class CORE_API NetworkProxySettings final {
   std::string username_;
   /// The proxy password.
   std::string password_;
+  /// The PEM-encoded HTTPS proxy CA certificates.
+  std::string ca_info_blob_;
 };
 
 }  // namespace http
diff --git a/olp-cpp-sdk-core/src/http/NetworkProxySettings.cpp b/olp-cpp-sdk-core/src/http/NetworkProxySettings.cpp
index e98cd54ca..cabfd5f1d 100644
--- a/olp-cpp-sdk-core/src/http/NetworkProxySettings.cpp
+++ b/olp-cpp-sdk-core/src/http/NetworkProxySettings.cpp
@@ -40,6 +40,10 @@ const std::string& NetworkProxySettings::GetPassword() const {
   return password_;
 }
 
+const std::string& NetworkProxySettings::GetCaInfoBlob() const {
+  return ca_info_blob_;
+}
+
 NetworkProxySettings& NetworkProxySettings::WithHostname(std::string hostname) {
   hostname_ = std::move(hostname);
   return *this;
@@ -65,5 +69,11 @@ NetworkProxySettings& NetworkProxySettings::WithPassword(std::string password) {
   return *this;
 }
 
+NetworkProxySettings& NetworkProxySettings::WithCaInfoBlob(
+    std::string ca_info_blob) {
+  ca_info_blob_ = std::move(ca_info_blob);
+  return *this;
+}
+
 }  // namespace http
 }  // namespace olp
diff --git a/olp-cpp-sdk-core/src/http/curl/NetworkCurl.cpp b/olp-cpp-sdk-core/src/http/curl/NetworkCurl.cpp
index 8251c0896..a9ab87800 100644
--- a/olp-cpp-sdk-core/src/http/curl/NetworkCurl.cpp
+++ b/olp-cpp-sdk-core/src/http/curl/NetworkCurl.cpp
@@ -337,6 +337,15 @@ void SetupProxy(CURL* curl_handle, const NetworkProxySettings& proxy) {
     curl_easy_setopt(curl_handle, CURLOPT_PROXYUSERNAME, username.c_str());
     curl_easy_setopt(curl_handle, CURLOPT_PROXYPASSWORD, password.c_str());
   }
+
+#ifdef OLP_SDK_CURL_HAS_SUPPORT_SSL_BLOBS
+  const auto& ca_info_blob = proxy.GetCaInfoBlob();
+  curl_blob proxy_ca_info_blob{};
+  proxy_ca_info_blob.data = const_cast<char*>(ca_info_blob.data());
+  proxy_ca_info_blob.len = ca_info_blob.size();
+  proxy_ca_info_blob.flags = CURL_BLOB_COPY;
+  curl_easy_setopt(curl_handle, CURLOPT_PROXY_CAINFO_BLOB, &proxy_ca_info_blob);
+#endif
 }
 
 void SetupRequestBody(CURL* curl_handle,
diff --git a/olp-cpp-sdk-core/tests/client/OlpClientTest.cpp b/olp-cpp-sdk-core/tests/client/OlpClientTest.cpp
index 1d9a296d0..3b4c7cae7 100644
--- a/olp-cpp-sdk-core/tests/client/OlpClientTest.cpp
+++ b/olp-cpp-sdk-core/tests/client/OlpClientTest.cpp
@@ -584,13 +584,16 @@ TEST_P(OlpClientTest, Timeout) {
 TEST_P(OlpClientTest, Proxy) {
   auto network = network_;
   client_settings_.retry_settings.timeout = 100;
+  const auto expected_ca_info_blob =
+      "-----BEGIN CERTIFICATE-----\nproxy-ca\n-----END CERTIFICATE-----\n";
   auto expected_settings =
       olp::http::NetworkProxySettings()
           .WithHostname("somewhere")
           .WithPort(1080)
-          .WithType(olp::http::NetworkProxySettings::Type::HTTP)
+          .WithType(olp::http::NetworkProxySettings::Type::HTTPS)
           .WithUsername("username1")
-          .WithPassword("1");
+          .WithPassword("1")
+          .WithCaInfoBlob(expected_ca_info_blob);
 
   client_settings_.proxy_settings = expected_settings;
   olp::http::NetworkProxySettings result_settings;
@@ -628,7 +631,8 @@ TEST_P(OlpClientTest, Proxy) {
   ASSERT_EQ(expected_settings.GetPassword(), result_settings.GetPassword());
   ASSERT_EQ(expected_settings.GetPort(), result_settings.GetPort());
   ASSERT_EQ(expected_settings.GetUsername(), result_settings.GetUsername());
-  ASSERT_EQ(expected_settings.GetPassword(), result_settings.GetPassword());
+  ASSERT_EQ(expected_settings.GetType(), result_settings.GetType());
+  ASSERT_EQ(expected_ca_info_blob, result_settings.GetCaInfoBlob());
 
   testing::Mock::VerifyAndClearExpectations(network.get());
 }