diff --git a/Dockerfile b/Dockerfile
index 22838e1..b649876 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -78,6 +78,7 @@ RUN set -e; \
   dpkg-reconfigure --frontend=noninteractive locales;update-locale LANG=$LANG
 
 ENV SHELL="/bin/bash"
+SHELL [ "/bin/bash", "-c" ]
 
 COPY ./rootfs/usr/local/bin/pkmgr /usr/local/bin/pkmgr
 COPY --from=gosu /usr/local/bin/gosu /usr/local/bin/gosu
diff --git a/Dockerfile.10 b/Dockerfile.10
index 35a0a9c..2eceea7 100644
--- a/Dockerfile.10
+++ b/Dockerfile.10
@@ -78,6 +78,7 @@ RUN set -e; \
   dpkg-reconfigure --frontend=noninteractive locales;update-locale LANG=$LANG
 
 ENV SHELL="/bin/bash"
+SHELL [ "/bin/bash", "-c" ]
 
 COPY ./rootfs/usr/local/bin/pkmgr /usr/local/bin/pkmgr
 COPY --from=gosu /usr/local/bin/gosu /usr/local/bin/gosu
diff --git a/Dockerfile.11 b/Dockerfile.11
index 1204bb4..d439765 100644
--- a/Dockerfile.11
+++ b/Dockerfile.11
@@ -78,6 +78,7 @@ RUN set -e; \
   dpkg-reconfigure --frontend=noninteractive locales;update-locale LANG=$LANG
 
 ENV SHELL="/bin/bash"
+SHELL [ "/bin/bash", "-c" ]
 
 COPY ./rootfs/usr/local/bin/pkmgr /usr/local/bin/pkmgr
 COPY --from=gosu /usr/local/bin/gosu /usr/local/bin/gosu
diff --git a/Dockerfile.12 b/Dockerfile.12
index 2432354..d07643d 100644
--- a/Dockerfile.12
+++ b/Dockerfile.12
@@ -78,6 +78,7 @@ RUN set -e; \
   dpkg-reconfigure --frontend=noninteractive locales;update-locale LANG=$LANG
 
 ENV SHELL="/bin/bash"
+SHELL [ "/bin/bash", "-c" ]
 
 COPY ./rootfs/usr/local/bin/pkmgr /usr/local/bin/pkmgr
 COPY --from=gosu /usr/local/bin/gosu /usr/local/bin/gosu
diff --git a/Dockerfile.13 b/Dockerfile.13
index ee896f5..16d26b4 100644
--- a/Dockerfile.13
+++ b/Dockerfile.13
@@ -78,6 +78,7 @@ RUN set -e; \
   dpkg-reconfigure --frontend=noninteractive locales;update-locale LANG=$LANG
 
 ENV SHELL="/bin/bash"
+SHELL [ "/bin/bash", "-c" ]
 
 COPY ./rootfs/usr/local/bin/pkmgr /usr/local/bin/pkmgr
 COPY --from=gosu /usr/local/bin/gosu /usr/local/bin/gosu