diff --git a/script/setup-musl b/script/setup-musl
index 118c98ec..921c6d7f 100755
--- a/script/setup-musl
+++ b/script/setup-musl
@@ -12,13 +12,14 @@ if [[ -z "${BABASHKA_MUSL:-}" ]]; then
     exit 0
 fi
 
-# This script sets up the latest available musl-tools using apt pinning from debian unstable.
-# The one available in stable and testing are quite outdated and this ensures we get the latest improvements
-# This explictly installs musl from unstable and keeps the others at a higher priority
+# This script sets up the latest available musl-tools using apt pinning from Debian bullseye (11).
+# The one available in stretch (Debian 9) is outdated and this ensures we get the latest improvements
+# This explictly installs musl from bullseye and keeps the others at a higher priority
+# TODO: remove after clojure image is updated to bullseye
 
 cat >> /etc/apt/sources.list <<eof
-deb http://ftp.us.debian.org/debian unstable main non-free contrib
-deb http://non-us.debian.org/debian-non-us unstable/non-us main contrib non-free
+deb http://ftp.us.debian.org/debian bullseye main non-free contrib
+deb http://non-us.debian.org/debian-non-us bullseye/non-us main contrib non-free
 eof
 
 cat >> /etc/apt/preferences <<eof
@@ -29,11 +30,11 @@ Package: *
 Pin: release a=testing
 Pin-Priority: 650
 Package: *
-pin: release a=unstable
+pin: release a=bullseye
 pin-priority: 600
 eof
 
-apt-get update -y && apt-get install musl-tools/unstable -y
+apt-get update -y && apt-get install musl-tools/bullseye -y
 
 ZLIB_VERSION="1.2.11"