diff --git a/deps/fluidsynth/include/fluidsynth/version.h b/deps/fluidsynth/include/fluidsynth/version.h
index d440352f..0ce76dc1 100644
--- a/deps/fluidsynth/include/fluidsynth/version.h
+++ b/deps/fluidsynth/include/fluidsynth/version.h
@@ -31,10 +31,10 @@ extern "C" {
  *
  * @{
  */
-#define FLUIDSYNTH_VERSION       "2.3.4"           /**< String constant of libfluidsynth version. */
+#define FLUIDSYNTH_VERSION       "2.3.5"           /**< String constant of libfluidsynth version. */
 #define FLUIDSYNTH_VERSION_MAJOR 2     /**< libfluidsynth major version integer constant. */
 #define FLUIDSYNTH_VERSION_MINOR 3     /**< libfluidsynth minor version integer constant. */
-#define FLUIDSYNTH_VERSION_MICRO 4     /**< libfluidsynth micro version integer constant. */
+#define FLUIDSYNTH_VERSION_MICRO 5     /**< libfluidsynth micro version integer constant. */
 
 FLUIDSYNTH_API void fluid_version(int *major, int *minor, int *micro);
 FLUIDSYNTH_API char* fluid_version_str(void);
diff --git a/deps/fluidsynth/lib/cmake/fluidsynth/FindInstPatch.cmake b/deps/fluidsynth/lib/cmake/fluidsynth/FindInstPatch.cmake
index e7750459..11289265 100644
--- a/deps/fluidsynth/lib/cmake/fluidsynth/FindInstPatch.cmake
+++ b/deps/fluidsynth/lib/cmake/fluidsynth/FindInstPatch.cmake
@@ -37,7 +37,7 @@ find_path(
 
 find_library(
   InstPatch_LIBRARY
-  NAMES "instpatch-1.0"
+  NAMES "instpatch-1.0" "instpatch-2"
   HINTS "${PC_INSTPATCH_LIBDIR}")
 
 # Get version from pkg-config or read the config header
diff --git a/deps/fluidsynth/lib/cmake/fluidsynth/FindOpus.cmake b/deps/fluidsynth/lib/cmake/fluidsynth/FindOpus.cmake
index 0258d456..bf77e293 100644
--- a/deps/fluidsynth/lib/cmake/fluidsynth/FindOpus.cmake
+++ b/deps/fluidsynth/lib/cmake/fluidsynth/FindOpus.cmake
@@ -53,13 +53,13 @@ find_library(
 
 # Get the version from pkg-config
 if(PC_OPUS_VERSION)
-  set(Opus_VERSION "${PC_OPUS_VERSION}")
+  set(Opus_VERSION "${PC_OPUS_VERSION}.0")
   set(OPUS_VERSION "${Opus_VERSION}")
   set(OPUS_VERSION_STRING "${Opus_VERSION}")
   string(REPLACE "." ";" _opus_version_list "${Opus_VERSION}")
   list(GET _opus_version_list 0 OPUS_VERSION_MAJOR)
   list(GET _opus_version_list 1 OPUS_VERSION_MINOR)
-  list(GET _opus_version_list 2 OPUS_VERSION_PATCH)
+  list(GET _opus_version_list 2 OPUS_VERSION_PATCH) # might be missing if zero, hence adding the .0 above
 else()
   message(STATUS "Unable to get Opus version without pkg-config.")
   set(Opus_VERSION)
diff --git a/deps/fluidsynth/lib/cmake/fluidsynth/FindSndFile.cmake b/deps/fluidsynth/lib/cmake/fluidsynth/FindSndFile.cmake
index d77333ba..7eff1062 100644
--- a/deps/fluidsynth/lib/cmake/fluidsynth/FindSndFile.cmake
+++ b/deps/fluidsynth/lib/cmake/fluidsynth/FindSndFile.cmake
@@ -50,7 +50,7 @@ find_path(
 
 find_library(
   _sndfile_library
-  NAMES "sndfile"
+  NAMES "sndfile" "sndfile-1"
   HINTS "${PC_SNDFILE_LIBDIR}")
 
 # Get version from pkg-config or read the config header
@@ -69,7 +69,8 @@ elseif(SndFile_INCLUDE_DIR)
 endif()
 
 # Check the features SndFile was built with
-if(PC_SNDFILE_FOUND)
+# 2024-01-02: Recent versions of libsndfile don't seem to provide a pkgconfig file and older version who did are lacking private libraries like OGG.
+if(TRUE) #PC_SNDFILE_FOUND
   if("vorbis" IN_LIST PC_SNDFILE_STATIC_LIBRARIES)
     set(SndFile_WITH_EXTERNAL_LIBS TRUE)
   endif()
diff --git a/deps/fluidsynth/lib/cmake/fluidsynth/Findmpg123.cmake b/deps/fluidsynth/lib/cmake/fluidsynth/Findmpg123.cmake
index 76e04127..3cb35167 100644
--- a/deps/fluidsynth/lib/cmake/fluidsynth/Findmpg123.cmake
+++ b/deps/fluidsynth/lib/cmake/fluidsynth/Findmpg123.cmake
@@ -92,7 +92,7 @@ find_package_handle_standard_args(
 # Create the targets
 foreach(_component libmpg123 libout123 libsyn123)
   if(mpg123_${_component}_FOUND AND NOT TARGET MPG123::${_component})
-    add_library(MPG123::${_component})
+    add_library(MPG123::${_component} UNKNOWN IMPORTED)
     set_target_properties(
       MPG123::${_component}
       PROPERTIES IMPORTED_LOCATION "${mpg123_${_component}_LIBRARY}"
diff --git a/deps/fluidsynth/lib/cmake/fluidsynth/FluidSynthConfigVersion.cmake b/deps/fluidsynth/lib/cmake/fluidsynth/FluidSynthConfigVersion.cmake
index 2dd5c023..17060a1a 100644
--- a/deps/fluidsynth/lib/cmake/fluidsynth/FluidSynthConfigVersion.cmake
+++ b/deps/fluidsynth/lib/cmake/fluidsynth/FluidSynthConfigVersion.cmake
@@ -10,13 +10,13 @@
 # The variable CVF_VERSION must be set before calling configure_file().
 
 
-set(PACKAGE_VERSION "2.3.4")
+set(PACKAGE_VERSION "2.3.5")
 
 if(PACKAGE_VERSION VERSION_LESS PACKAGE_FIND_VERSION)
   set(PACKAGE_VERSION_COMPATIBLE FALSE)
 else()
 
-  if("2.3.4" MATCHES "^([0-9]+)\\.([0-9]+)")
+  if("2.3.5" MATCHES "^([0-9]+)\\.([0-9]+)")
     set(CVF_VERSION_MAJOR "${CMAKE_MATCH_1}")
     set(CVF_VERSION_MINOR "${CMAKE_MATCH_2}")
 
@@ -27,7 +27,7 @@ else()
       string(REGEX REPLACE "^0+" "" CVF_VERSION_MINOR "${CVF_VERSION_MINOR}")
     endif()
   else()
-    set(CVF_VERSION_MAJOR "2.3.4")
+    set(CVF_VERSION_MAJOR "2.3.5")
     set(CVF_VERSION_MINOR "")
   endif()
 
diff --git a/deps/fluidsynth/lib/libfluidsynth.a b/deps/fluidsynth/lib/libfluidsynth.a
index cd974d15..889326b1 100644
Binary files a/deps/fluidsynth/lib/libfluidsynth.a and b/deps/fluidsynth/lib/libfluidsynth.a differ
diff --git a/deps/fluidsynth/lib/pkgconfig/fluidsynth.pc b/deps/fluidsynth/lib/pkgconfig/fluidsynth.pc
index a4ecd1cd..e5e4432e 100644
--- a/deps/fluidsynth/lib/pkgconfig/fluidsynth.pc
+++ b/deps/fluidsynth/lib/pkgconfig/fluidsynth.pc
@@ -5,7 +5,7 @@ includedir=${prefix}/include
 
 Name: FluidSynth
 Description: Software SoundFont synth
-Version: 2.3.4
+Version: 2.3.5
 Requires.private: glib-2.0 gthread-2.0 sndfile libinstpatch-1.0
 Libs: -L${libdir} -lfluidsynth
 Libs.private: -lm -Wl,-framework,CoreAudio,-framework,AudioUnit -Wl,-framework,CoreMIDI,-framework,CoreServices