diff --git a/Frameworks/libsidplayfp/README.md b/Frameworks/libsidplayfp/README.md
new file mode 100644
index 000000000..90b7e8ec7
--- /dev/null
+++ b/Frameworks/libsidplayfp/README.md
@@ -0,0 +1,16 @@
+update-generated.sh requires the following:
+
+```
+brew install libgcrypt xa coreutils
+```
+
+For these needs:
+
+1) libgcrypt is required by the autoreconf process, even if it is
+   being configured as excluded or disabled.
+2) xa is required to assemble the SID player binary objects in the
+   repository.
+3) coreutils is required for GNU od, because BSD od as included
+   with macOS does not support the -w switch. The included autoconf
+   scripts will prefer `god` if found.
+
diff --git a/Frameworks/libsidplayfp/generated/src/builders/residfp-builder/residfp/siddefs-fp.h b/Frameworks/libsidplayfp/generated/src/builders/residfp-builder/residfp/siddefs-fp.h
index 62cd250f3..a0ca7bec6 100644
--- a/Frameworks/libsidplayfp/generated/src/builders/residfp-builder/residfp/siddefs-fp.h
+++ b/Frameworks/libsidplayfp/generated/src/builders/residfp-builder/residfp/siddefs-fp.h
@@ -51,7 +51,7 @@ extern "C"
 #ifndef __VERSION_CC__
 extern const char* residfp_version_string;
 #else
-const char* residfp_version_string = "2.2.0";
+const char* residfp_version_string = "2.3.1";
 #endif
 }
 
diff --git a/Frameworks/libsidplayfp/generated/src/config.h b/Frameworks/libsidplayfp/generated/src/config.h
index 9bb389772..b51413e56 100644
--- a/Frameworks/libsidplayfp/generated/src/config.h
+++ b/Frameworks/libsidplayfp/generated/src/config.h
@@ -91,6 +91,9 @@
 /* define if the compiler supports basic C++11 syntax */
 #define HAVE_CXX11 1
 
+/* define if the compiler supports basic C++14 syntax */
+#define HAVE_CXX14 1
+
 /* Define to 1 if you have the <dlfcn.h> header file. */
 #define HAVE_DLFCN_H 1
 
@@ -176,7 +179,7 @@
 #define PACKAGE_NAME "libsidplayfp"
 
 /* Define to the full name and version of this package. */
-#define PACKAGE_STRING "libsidplayfp 2.2.0"
+#define PACKAGE_STRING "libsidplayfp 2.3.1"
 
 /* Define to the one symbol short name of this package. */
 #define PACKAGE_TARNAME "libsidplayfp"
@@ -185,7 +188,7 @@
 #define PACKAGE_URL "https://github.com/libsidplayfp/libsidplayfp/"
 
 /* Define to the version of this package. */
-#define PACKAGE_VERSION "2.2.0"
+#define PACKAGE_VERSION "2.3.1"
 
 /* Define to necessary symbol if this constant uses a non-standard name on
    your system. */
@@ -206,7 +209,7 @@
 #define STDC_HEADERS 1
 
 /* Version number of package */
-#define VERSION "2.2.0"
+#define VERSION "2.3.1"
 
 /* Path to VICE testsuite. */
 /* #undef VICE_TESTSUITE */
diff --git a/Frameworks/libsidplayfp/generated/src/sidplayfp/sidversion.h b/Frameworks/libsidplayfp/generated/src/sidplayfp/sidversion.h
index 054cdbfed..822b4a8eb 100644
--- a/Frameworks/libsidplayfp/generated/src/sidplayfp/sidversion.h
+++ b/Frameworks/libsidplayfp/generated/src/sidplayfp/sidversion.h
@@ -8,7 +8,7 @@
 
 
 #define LIBSIDPLAYFP_VERSION_MAJ 2
-#define LIBSIDPLAYFP_VERSION_MIN 2
-#define LIBSIDPLAYFP_VERSION_LEV 0
+#define LIBSIDPLAYFP_VERSION_MIN 3
+#define LIBSIDPLAYFP_VERSION_LEV 1
 
 #endif
diff --git a/Frameworks/libsidplayfp/sidplayfp b/Frameworks/libsidplayfp/sidplayfp
index a16ffd158..4dbd7dce6 160000
--- a/Frameworks/libsidplayfp/sidplayfp
+++ b/Frameworks/libsidplayfp/sidplayfp
@@ -1 +1 @@
-Subproject commit a16ffd1580aa32095b7e9df45795031b2e211906
+Subproject commit 4dbd7dce6212674f75478be40057b3e6e5d9aab5