diff --git a/configure b/configure
index 80bed0770..30d29ab8d 100755
--- a/configure
+++ b/configure
@@ -8984,7 +8984,7 @@ fi
 if test "$has_system_sodium" = "no"
 then :
 
-sodium_version="1.0.21"
+sodium_version="1.0.20"
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: extracting sodium library" >&5
 printf "%s\n" "extracting sodium library" >&6; }
 cur_dir=`pwd`
diff --git a/configure.ac b/configure.ac
index c665625a3..1235cdee2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -746,7 +746,7 @@ AS_IF([test "x$PRIVATELIBDIR" != "x"], [rm -f "$PRIVATELIBDIR/"libsodium*])],[ha
 
 AS_IF([test "$has_system_sodium" = "no"],[
 dnl REMEMBER TO CHANGE WITH A NEW SODIUM RELEASE!
-sodium_version="1.0.21"
+sodium_version="1.0.20"
 AC_MSG_RESULT(extracting sodium library)
 cur_dir=`pwd`
 cd extras
diff --git a/doc/RELEASE-NOTES.md b/doc/RELEASE-NOTES.md
index 3581ed4b7..8891d5b60 100644
--- a/doc/RELEASE-NOTES.md
+++ b/doc/RELEASE-NOTES.md
@@ -99,6 +99,8 @@ This is work in progress and may not always be a stable version.
 * Errors in TLS certificate/keys are now fatal errors.
 
 ### Fixes:
+* Downgrade shipped sodium library to 1.0.20 to fix arm64 compile issue
+  with 1.0.21.
 * The Windows version could crash after a few minutes due to missing MODVAR.
 * Named extbans in `+e` and `+I` were supposed to be sent with letters instead
   of names to servers not supporting them (UnrealIRCd older than 6 and Services),
diff --git a/extras/libsodium.tar.gz b/extras/libsodium.tar.gz
index e4c6c3fad..2f6efbdb4 100644
Binary files a/extras/libsodium.tar.gz and b/extras/libsodium.tar.gz differ