diff --git a/scripts/release/freebsd_aarch64/p2pool_freebsd_aarch64.sh b/scripts/release/freebsd_aarch64/p2pool_freebsd_aarch64.sh
index 6c38661..f0584af 100755
--- a/scripts/release/freebsd_aarch64/p2pool_freebsd_aarch64.sh
+++ b/scripts/release/freebsd_aarch64/p2pool_freebsd_aarch64.sh
@@ -52,4 +52,4 @@ chmod 0755 $1/p2pool
 
 tar cvf $1.tar --format=pax --pax-option='exthdr.name=%d/PaxHeaders/%f,delete=atime,delete=ctime' --sort=name --owner=0 --group=0 --mtime="$CURRENT_DATE $CURRENT_TIME" $1
 touch -t $TOUCH_DATE $1.tar
-7z a -mx=9 -tgzip -stl $1.tar.gz $1.tar
+7z a -tgzip -mx9 -mfb256 -stl $1.tar.gz $1.tar
diff --git a/scripts/release/freebsd_x64/p2pool_freebsd_x64.sh b/scripts/release/freebsd_x64/p2pool_freebsd_x64.sh
index 5b9a7ee..3674319 100755
--- a/scripts/release/freebsd_x64/p2pool_freebsd_x64.sh
+++ b/scripts/release/freebsd_x64/p2pool_freebsd_x64.sh
@@ -52,4 +52,4 @@ chmod 0755 $1/p2pool
 
 tar cvf $1.tar --format=pax --pax-option='exthdr.name=%d/PaxHeaders/%f,delete=atime,delete=ctime' --sort=name --owner=0 --group=0 --mtime="$CURRENT_DATE $CURRENT_TIME" $1
 touch -t $TOUCH_DATE $1.tar
-7z a -mx=9 -tgzip -stl $1.tar.gz $1.tar
+7z a -tgzip -mx9 -mfb256 -stl $1.tar.gz $1.tar
diff --git a/scripts/release/linux_aarch64/p2pool_linux_aarch64.sh b/scripts/release/linux_aarch64/p2pool_linux_aarch64.sh
index d3f0b69..7debd17 100755
--- a/scripts/release/linux_aarch64/p2pool_linux_aarch64.sh
+++ b/scripts/release/linux_aarch64/p2pool_linux_aarch64.sh
@@ -52,4 +52,4 @@ chmod 0755 $1/p2pool
 
 tar cvf $1.tar --format=pax --pax-option='exthdr.name=%d/PaxHeaders/%f,delete=atime,delete=ctime' --sort=name --owner=0 --group=0 --mtime="$CURRENT_DATE $CURRENT_TIME" $1
 touch -t $TOUCH_DATE $1.tar
-7z a -mx=9 -tgzip -stl $1.tar.gz $1.tar
+7z a -tgzip -mx9 -mfb256 -stl $1.tar.gz $1.tar
diff --git a/scripts/release/linux_riscv64/p2pool_linux_riscv64.sh b/scripts/release/linux_riscv64/p2pool_linux_riscv64.sh
index e08357e..1938b53 100755
--- a/scripts/release/linux_riscv64/p2pool_linux_riscv64.sh
+++ b/scripts/release/linux_riscv64/p2pool_linux_riscv64.sh
@@ -52,4 +52,4 @@ chmod 0755 $1/p2pool
 
 tar cvf $1.tar --format=pax --pax-option='exthdr.name=%d/PaxHeaders/%f,delete=atime,delete=ctime' --sort=name --owner=0 --group=0 --mtime="$CURRENT_DATE $CURRENT_TIME" $1
 touch -t $TOUCH_DATE $1.tar
-7z a -mx=9 -tgzip -stl $1.tar.gz $1.tar
+7z a -tgzip -mx9 -mfb256 -stl $1.tar.gz $1.tar
diff --git a/scripts/release/linux_x64/p2pool_linux_x64.sh b/scripts/release/linux_x64/p2pool_linux_x64.sh
index 445c214..05d19e7 100755
--- a/scripts/release/linux_x64/p2pool_linux_x64.sh
+++ b/scripts/release/linux_x64/p2pool_linux_x64.sh
@@ -52,4 +52,4 @@ chmod 0755 $1/p2pool
 
 tar cvf $1.tar --format=pax --pax-option='exthdr.name=%d/PaxHeaders/%f,delete=atime,delete=ctime' --sort=name --owner=0 --group=0 --mtime="$CURRENT_DATE $CURRENT_TIME" $1
 touch -t $TOUCH_DATE $1.tar
-7z a -mx=9 -tgzip -stl $1.tar.gz $1.tar
+7z a -tgzip -mx9 -mfb256 -stl $1.tar.gz $1.tar
diff --git a/scripts/release/macos_aarch64/p2pool_macos_aarch64.sh b/scripts/release/macos_aarch64/p2pool_macos_aarch64.sh
index b28603b..01956b6 100755
--- a/scripts/release/macos_aarch64/p2pool_macos_aarch64.sh
+++ b/scripts/release/macos_aarch64/p2pool_macos_aarch64.sh
@@ -54,4 +54,4 @@ chmod 0755 $1/p2pool
 
 tar cvf $1.tar --format=pax --pax-option='exthdr.name=%d/PaxHeaders/%f,delete=atime,delete=ctime' --sort=name --owner=0 --group=0 --mtime="$CURRENT_DATE $CURRENT_TIME" $1
 touch -t $TOUCH_DATE $1.tar
-7z a -mx=9 -tgzip -stl $1.tar.gz $1.tar
+7z a -tgzip -mx9 -mfb256 -stl $1.tar.gz $1.tar
diff --git a/scripts/release/macos_x64/p2pool_macos_x64.sh b/scripts/release/macos_x64/p2pool_macos_x64.sh
index b3ae12f..9019dcb 100755
--- a/scripts/release/macos_x64/p2pool_macos_x64.sh
+++ b/scripts/release/macos_x64/p2pool_macos_x64.sh
@@ -54,4 +54,4 @@ chmod 0755 $1/p2pool
 
 tar cvf $1.tar --format=pax --pax-option='exthdr.name=%d/PaxHeaders/%f,delete=atime,delete=ctime' --sort=name --owner=0 --group=0 --mtime="$CURRENT_DATE $CURRENT_TIME" $1
 touch -t $TOUCH_DATE $1.tar
-7z a -mx=9 -tgzip -stl $1.tar.gz $1.tar
+7z a -tgzip -mx9 -mfb256 -stl $1.tar.gz $1.tar
diff --git a/scripts/release/windows_x64/p2pool_windows_x64.sh b/scripts/release/windows_x64/p2pool_windows_x64.sh
index 28071ff..4abd3f5 100755
--- a/scripts/release/windows_x64/p2pool_windows_x64.sh
+++ b/scripts/release/windows_x64/p2pool_windows_x64.sh
@@ -57,4 +57,4 @@ chmod 0755 $1/p2pool.exe
 
 touch -t $TOUCH_DATE $1
 touch -t $TOUCH_DATE $1/*
-7z a -mx=9 -tzip -stl $1.zip $1
+7z a -tzip -mx9 -mfb256 -stl $1.zip $1