diff --git a/build/bin/sage-system-python b/build/bin/sage-system-python
index 7ba5ed30257..75167d58ec4 100755
--- a/build/bin/sage-system-python
+++ b/build/bin/sage-system-python
@@ -20,7 +20,7 @@ fi
 #
 # See https://trac.sagemath.org/ticket/29090
 
-PYTHONS="python3 python3.8 python3.7 python2.7 python python3.6 python2"
+PYTHONS="python2 python3 python3.8 python3.7 python2.7 python python3.6 python2"
 for PY in $PYTHONS; do
     PYTHON="$(PATH="$SAGE_ORIG_PATH" command -v $PY)"
     if [[ -n "$PYTHON" ]]; then
diff --git a/build/pkgs/arb/checksums.ini b/build/pkgs/arb/checksums.ini
index 3e0307d9140..6de00342908 100644
--- a/build/pkgs/arb/checksums.ini
+++ b/build/pkgs/arb/checksums.ini
@@ -1,4 +1,5 @@
 tarball=arb-VERSION.tar.gz
-sha1=cdbb3d63034a39f22f850def9bd365f7073f620a
-md5=17816f8aa027a5e7fb8b5e62b2b40ce4
-cksum=577630044
+sha1=2413945982b8da63f51750d1f18ac801af4ed42f
+md5=0fa2bf5c384183fb6c8a6ad353200d34
+cksum=2778782461
+upstream_url=https://github.com/fredrik-johansson/arb/archive/VERSION.tar.gz
diff --git a/build/pkgs/arb/package-version.txt b/build/pkgs/arb/package-version.txt
index b2242a0ff1c..cf8690732fe 100644
--- a/build/pkgs/arb/package-version.txt
+++ b/build/pkgs/arb/package-version.txt
@@ -1 +1 @@
-2.16.0.p0
+2.18.0
diff --git a/build/pkgs/arb/spkg-install.in b/build/pkgs/arb/spkg-install.in
index 4aa200a2b91..9322f04c912 100644
--- a/build/pkgs/arb/spkg-install.in
+++ b/build/pkgs/arb/spkg-install.in
@@ -1,9 +1,5 @@
 cd src
 
-# The git head of arb now honors LDFLAGS; The following workaround can
-# be removed in arb >= 2.8 when it is released
-export EXTRA_SHARED_FLAGS=$LDFLAGS
-
 # Trac #29607: We must always supply --with-gmp, --with-mpfr,
 # --with-flint because otherwise ARB's configure script uses
 # /usr/local, which is always wrong.