diff --git a/NEWS b/NEWS
index 509865594..b41747167 100644
--- a/NEWS
+++ b/NEWS
@@ -22,6 +22,8 @@ ver 0.24 (not yet released)
 * remove Haiku support
 
 ver 0.23.10 (not yet released)
+* encoder
+  - flac: fix failure when libFLAC is built without Ogg support
 * Windows
   - log to stdout by default, don't require "log_file" setting
 
diff --git a/python/build/libs.py b/python/build/libs.py
index 3409c63f6..0a502c84a 100644
--- a/python/build/libs.py
+++ b/python/build/libs.py
@@ -43,13 +43,15 @@ opus = AutotoolsProject(
 )
 
 flac = AutotoolsProject(
-    'http://downloads.xiph.org/releases/flac/flac-1.3.4.tar.xz',
-    '8ff0607e75a322dd7cd6ec48f4f225471404ae2730d0ea945127b1355155e737',
+    'http://downloads.xiph.org/releases/flac/flac-1.4.0.tar.xz',
+    'af41c0733c93c237c3e52f64dd87e3b0d9af38259f1c7d11e8cbf583c48c2506',
     'lib/libFLAC.a',
     [
         '--disable-shared', '--enable-static',
+        '--disable-stack-smash-protection',
         '--disable-xmms-plugin', '--disable-cpplibs',
         '--disable-doxygen-docs',
+        '--disable-programs',
     ],
     subdirs=['include', 'src/libFLAC'],
 )
@@ -445,7 +447,7 @@ jack = JackProject(
 )
 
 boost = BoostProject(
-    'https://boostorg.jfrog.io/artifactory/main/release/1.79.0/source/boost_1_79_0.tar.bz2',
-    '475d589d51a7f8b3ba2ba4eda022b170e562ca3b760ee922c146b6c65856ef39',
+    'https://boostorg.jfrog.io/artifactory/main/release/1.80.0/source/boost_1_80_0.tar.bz2',
+    '1e19565d82e43bc59209a168f5ac899d3ba471d55c7610c677d4ccf2c9c500c0',
     'include/boost/version.hpp',
 )
diff --git a/src/encoder/plugins/FlacEncoderPlugin.cxx b/src/encoder/plugins/FlacEncoderPlugin.cxx
index 0c320f19c..83768bf6c 100644
--- a/src/encoder/plugins/FlacEncoderPlugin.cxx
+++ b/src/encoder/plugins/FlacEncoderPlugin.cxx
@@ -41,6 +41,7 @@ class FlacEncoder final : public Encoder {
 
 	FLAC__StreamEncoder *const fse;
 	const unsigned compression;
+	const bool oggflac;
 
 	PcmBuffer expand_buffer;
 
@@ -127,7 +128,7 @@ flac_encoder_init(const ConfigBlock &block)
 }
 
 static void
-flac_encoder_setup(FLAC__StreamEncoder *fse, unsigned compression,
+flac_encoder_setup(FLAC__StreamEncoder *fse, unsigned compression, bool oggflac,
 		   const AudioFormat &audio_format)
 {
 	unsigned bits_per_sample;
@@ -162,7 +163,7 @@ flac_encoder_setup(FLAC__StreamEncoder *fse, unsigned compression,
 		throw FormatRuntimeError("error setting flac sample rate to %d",
 					 audio_format.sample_rate);
 
-	if (!FLAC__stream_encoder_set_ogg_serial_number(fse,
+	if (oggflac && !FLAC__stream_encoder_set_ogg_serial_number(fse,
 						  GenerateSerial()))
 		throw FormatRuntimeError("error setting ogg serial number");
 }
@@ -170,11 +171,12 @@ flac_encoder_setup(FLAC__StreamEncoder *fse, unsigned compression,
 FlacEncoder::FlacEncoder(AudioFormat _audio_format, FLAC__StreamEncoder *_fse, unsigned _compression, bool _oggflac, bool _oggchaining)
 	:Encoder(_oggchaining),
 	 audio_format(_audio_format), fse(_fse),
-	 compression(_compression)
+	 compression(_compression),
+	 oggflac(_oggflac)
 {
 	/* this immediately outputs data through callback */
 
-	auto init_status = _oggflac ?
+	auto init_status = oggflac ?
 		FLAC__stream_encoder_init_ogg_stream(fse,
 						     nullptr, WriteCallback,
 						     nullptr, nullptr, nullptr,
@@ -213,7 +215,7 @@ PreparedFlacEncoder::Open(AudioFormat &audio_format)
 		throw std::runtime_error("FLAC__stream_encoder_new() failed");
 
 	try {
-		flac_encoder_setup(fse, compression, audio_format);
+		flac_encoder_setup(fse, compression, oggflac, audio_format);
 	} catch (...) {
 		FLAC__stream_encoder_delete(fse);
 		throw;
@@ -226,7 +228,7 @@ void
 FlacEncoder::SendTag(const Tag &tag)
 {
 	/* re-initialize encoder since flac_encoder_finish resets everything */
-	flac_encoder_setup(fse, compression, audio_format);
+	flac_encoder_setup(fse, compression, oggflac, audio_format);
 
 	FLAC__StreamMetadata *metadata = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT);
 	FLAC__StreamMetadata_VorbisComment_Entry entry;
diff --git a/src/input/plugins/CurlInputPlugin.cxx b/src/input/plugins/CurlInputPlugin.cxx
index 1513101e2..1c314c364 100644
--- a/src/input/plugins/CurlInputPlugin.cxx
+++ b/src/input/plugins/CurlInputPlugin.cxx
@@ -437,6 +437,8 @@ CurlInputStream::InitEasy()
 	request->SetVerifyPeer(verify_peer);
 	request->SetVerifyHost(verify_host);
 	request->SetOption(CURLOPT_HTTPHEADER, request_headers.Get());
+	request->SetProxyVerifyPeer(verify_peer);
+	request->SetProxyVerifyHost(verify_host);
 }
 
 void
diff --git a/src/lib/curl/Request.hxx b/src/lib/curl/Request.hxx
index e36ddce6b..49552a26f 100644
--- a/src/lib/curl/Request.hxx
+++ b/src/lib/curl/Request.hxx
@@ -122,6 +122,14 @@ public:
 		easy.SetVerifyPeer(value);
 	}
 
+	void SetProxyVerifyHost(bool value) {
+		easy.SetOption(CURLOPT_PROXY_SSL_VERIFYHOST, value ? 2L : 0L);
+	}
+
+	void SetProxyVerifyPeer(bool value) {
+		easy.SetOption(CURLOPT_PROXY_SSL_VERIFYPEER, value);
+	}
+
 	void SetNoBody(bool value=true) {
 		easy.SetNoBody(value);
 	}