diff --git a/Dockerfile b/Dockerfile
index 4ece951..0c09a60 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -29,9 +29,9 @@ ENV LD_LIBRARY_PATH=${EPICS_BASE}/lib/${EPICS_HOST_ARCH}
 ENV VIRTUALENV /venv
 ENV PATH=${VIRTUALENV}/bin:${EPICS_BASE}/bin/${EPICS_HOST_ARCH}:${PATH}
 ENV SUPPORT ${EPICS_ROOT}/support
-ENV GLOBAL_RELEASE ${SUPPORT}/configure/RELEASE
 ENV IOC ${EPICS_ROOT}/ioc
 ENV RTEMS_TOP=/rtems
+
 ENV EPICS_VERSION=R7.0.7
 
 
@@ -86,14 +86,9 @@ RUN bash /epics/scripts/patch-epics-base.sh
 RUN make -C ${EPICS_BASE} -j $(nproc)
 
 # also build the sequencer as it is used by many support modules
-RUN wget https://github.com/ISISComputingGroup/EPICS-seq/archive/refs/tags/vendor_2_2_9.tar.gz && \
-    tar -xzf vendor*.tar.gz -C ${SUPPORT} && \
-    rm vendor*.tar.gz && \
-    mv ${SUPPORT}/EPICS-seq* ${SUPPORT}/sncseq && \
-    echo EPICS_BASE=${EPICS_BASE} > ${SUPPORT}/sncseq/configure/RELEASE
+RUN bash /epics/scripts/get-sncseq.sh
 RUN make -C ${SUPPORT}/sncseq -j $(nproc)
 
-
 # setup a global python venv and install ibek
 RUN python3 -m venv ${VIRTUALENV} && pip install ibek==1.3.0
 
diff --git a/epics/scripts/get-sncseq.sh b/epics/scripts/get-sncseq.sh
new file mode 100644
index 0000000..16f8d4f
--- /dev/null
+++ b/epics/scripts/get-sncseq.sh
@@ -0,0 +1,10 @@
+# we keep the sncseq source in our own epics-base repo because
+# the original source has been removed for the moment
+# (BESSY Hack: https://www.helmholtz.de/en/newsroom/bessy-ii-back-in-operation-after-cyber-attack-on-helmholtz-zentrum-berlin-hzb/)
+
+cd /tmp
+
+wget https://github.com/epics-containers/epics-base/raw/dev/vendor_2_2_9.tar.gz
+tar -xzf vendor*.tar.gz -C ${SUPPORT}
+rm vendor*.tar.gz
+mv ${SUPPORT}/EPICS-seq* ${SUPPORT}/sncseq