diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 081ead1..94e4d37 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -218,12 +218,14 @@ jobs:
             ~/.platformio
             examples/${{ matrix.example }}/.pio
             examples/${{ matrix.example }}/managed_components
-          key: pio-${{ matrix.example }}-${{ hashFiles(format('examples/{0}/platformio.ini', matrix.example), format('examples/{0}/dependencies.lock', matrix.example)) }}
+          key: pio-core-6.1.19-${{ matrix.example }}-${{ hashFiles(format('examples/{0}/platformio.ini', matrix.example), format('examples/{0}/dependencies.lock', matrix.example)) }}
           restore-keys: |
-            pio-${{ matrix.example }}-
+            pio-core-6.1.19-${{ matrix.example }}-
 
       - name: Install PlatformIO
-        run: pip install platformio
+        # The pinned pioarduino platform requires SCons 4.8.1, as used by Core 6.1.19.
+        # Core 6.2 replaces it with 4.11.1 during the build (pioarduino/platform-espressif32#529).
+        run: pip install "platformio==6.1.19"
 
       # This is the only build that compiles the component's ESP-only code paths, so it is
       # where their warnings have to be errors. The example's platformio.ini turns ENABLE_WERROR
diff --git a/src/types.cpp b/src/types.cpp
index e785233..f4d2077 100644
--- a/src/types.cpp
+++ b/src/types.cpp
@@ -113,7 +113,8 @@ static AudioFileType type_from_content_type(const char* content_type) {
 #endif
     }
 #ifdef MICRO_DECODER_CODEC_WAV
-    if (contains("audio/wav") || contains("audio/x-wav") || contains("audio/wave")) {
+    if (contains("audio/wav") || contains("audio/x-wav") || contains("audio/wave") ||
+        contains("audio/vnd.wave")) {
         return AudioFileType::WAV;
     }
 #endif
diff --git a/tests/test_micro_decoder.cpp b/tests/test_micro_decoder.cpp
index 3bd8bde..0f9da25 100644
--- a/tests/test_micro_decoder.cpp
+++ b/tests/test_micro_decoder.cpp
@@ -492,6 +492,9 @@ static bool test_detect_content_type() {
         {"audio/wav", nullptr, AudioFileType::WAV},
         {"audio/x-wav", nullptr, AudioFileType::WAV},
         {"audio/wave", nullptr, AudioFileType::WAV},
+        {"audio/vnd.wave", nullptr, AudioFileType::WAV},
+        {"audio/vnd.wave; codec=1", "http://x.example/chime", AudioFileType::WAV},
+        {"Audio/Vnd.Wave; codec=1", "http://x.example/chime?token=1", AudioFileType::WAV},
 
         // Parameters and case-insensitivity
         {"audio/mpeg; charset=UTF-8", nullptr, AudioFileType::MP3},
@@ -519,6 +522,7 @@ static bool test_detect_content_type() {
         // Unknown types with no usable URL
         {"text/html", nullptr, AudioFileType::NONE},
         {"application/octet-stream", nullptr, AudioFileType::NONE},
+        {"application/vnd.wave", nullptr, AudioFileType::NONE},
         {"", nullptr, AudioFileType::NONE},
         {nullptr, nullptr, AudioFileType::NONE},
 
@@ -1086,7 +1090,7 @@ static bool test_destructor_while_playing() {
 // DecoderSource: play_url() path
 // ============================================================================
 
-static bool test_play_url_stream() {
+static bool check_play_url_stream(const char* content_type) {
     // Full HTTP pipeline with the file type coming from Content-Type alone
     // (the URL path has no extension): PCM must arrive bit-exact and the
     // stream must end in IDLE.
@@ -1094,7 +1098,7 @@ static bool test_play_url_stream() {
     std::vector<uint8_t> wav = make_wav(2, 44100, 8192, &payload);
 
     TestHttpServer::Response resp;
-    resp.content_type = "audio/wav";
+    resp.content_type = content_type;
     resp.body = wav;
     resp.chunk_size = 4096;  // stream in pieces so the ring buffer matters
     TestHttpServer server;
@@ -1120,6 +1124,11 @@ static bool test_play_url_stream() {
     return true;
 }
 
+static bool test_play_url_stream() {
+    return check_play_url_stream("audio/wav") &&
+           check_play_url_stream("audio/vnd.wave; codec=1");
+}
+
 static bool test_play_url_extension_fallback() {
     // No Content-Type header at all: the file type must come from the URL
     // extension.