diff --git a/.ci-dockerfiles/x86-64-unknown-linux-musl-builder/Dockerfile b/.ci-dockerfiles/x86-64-unknown-linux-musl-builder/Dockerfile
index 95fa60dea9..a13416410d 100644
--- a/.ci-dockerfiles/x86-64-unknown-linux-musl-builder/Dockerfile
+++ b/.ci-dockerfiles/x86-64-unknown-linux-musl-builder/Dockerfile
@@ -17,6 +17,7 @@ RUN apk update \
   curl \
   py3-pip \
   gdb \
+  lldb \
 && pip install cloudsmith-cli
 
 # add user pony in order to not run tests as root
diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index 59eb834246..5af16a225e 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -90,9 +90,9 @@ jobs:
           - image: ghcr.io/ponylang/ponyc-ci-x86-64-unknown-linux-ubuntu22.04-builder:20230924
             name: x86-64 Linux glibc
             debugger: lldb
-          - image: ghcr.io/ponylang/ponyc-ci-x86-64-unknown-linux-musl-builder:20230830
+          - image: ghcr.io/ponylang/ponyc-ci-x86-64-unknown-linux-musl-builder:20231003
             name: x86-64 Linux musl
-            debugger: gdb
+            debugger: lldb
 
     name: ${{ matrix.name }}
     container: