diff --git a/debian/control b/debian/control
index 377173ab..0d44b3bb 100644
--- a/debian/control
+++ b/debian/control
@@ -6,7 +6,6 @@ Homepage: https://www.sipwise.com/
 Standards-Version: 3.9.8
 Build-Depends:
  debhelper-compat (= 12),
- dh-python,
  flite-dev,
  libcurl4-openssl-dev | libcurl4-gnutls-dev,
  libev-dev,
@@ -20,8 +19,6 @@ Build-Depends:
  libssl-dev,
  libxml2-dev,
  openssl,
- python-dev,
- python-sip-dev,
 
 Package: ngcp-sems
 Architecture: any
@@ -32,7 +29,6 @@ Depends:
  ngcp-prompts,
  ngcp-system-tools,
  ${misc:Depends},
- ${python:Depends},
  ${shlibs:Depends},
 Conflicts:
  sems,
diff --git a/debian/patches/series b/debian/patches/series
index b956f4be..5b0785a4 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -35,3 +35,4 @@ sipwise/0001-TT-34704-Fix-sems-and-sems-pbx-to-write-pid-file-whe.patch
 sipwise/0001-TT-53685-add_header_pattern_match_support.patch
 sipwise/add-vsc-to-disable_all_cf.patch
 sipwise/handle_bye_after_180.patch
+sipwise/upgrade_to_bullseye.patch
diff --git a/debian/patches/sipwise/upgrade_to_bullseye.patch b/debian/patches/sipwise/upgrade_to_bullseye.patch
new file mode 100644
index 00000000..71d2301b
--- /dev/null
+++ b/debian/patches/sipwise/upgrade_to_bullseye.patch
@@ -0,0 +1,34 @@
+Index: sems/Makefile.defs
+===================================================================
+--- sems.orig/Makefile.defs
++++ sems/Makefile.defs
+@@ -85,7 +85,10 @@ exclude_core_modules = g729 silk
+ # build in support for monitoring?
+ #
+ #
+-USE_MONITORING=yes
++USE_MONITORING=no
++
++#include SBC tools into build
++USE_SBC_TOOLS=no
+ 
+ # Support for long debug messages? (useful for debugging SIP messages' contents)
+ #
+Index: sems/apps/sbc/Makefile
+===================================================================
+--- sems.orig/apps/sbc/Makefile
++++ sems/apps/sbc/Makefile
+@@ -4,7 +4,12 @@ module_ldflags =
+ module_cflags  =
+ 
+ extra_target = make_call_control_mods
+-extra_install = install_tools install_call_control_mods
++extra_install = install_call_control_mods
++
++ifeq ($(USE_SBC_TOOLS), yes)
++extra_install += install_tools
++endif
++
+ extra_clean = clean_call_control_mods
+ 
+ COREPATH ?= ../../core
diff --git a/debian/rules b/debian/rules
index 7758f62d..1e09e40a 100755
--- a/debian/rules
+++ b/debian/rules
@@ -4,11 +4,9 @@
 # Uncomment this to turn on verbose mode.
 export DH_VERBOSE=1
 
-PYTHON_MODULES=ivr conf_auth mailbox pin_collect
+EXCLUDED_MODULES=conf_auth examples examples/db_announce fast_ack gateway ivr mailbox mp3 pin_collect twit webconference
 
-EXCLUDED_MODULES=gateway mp3 twit
-
-EXCLUDED_DSM_MODULES=mod_aws
+EXCLUDED_DSM_MODULES=mod_aws mod_py
 EXCLUDED_DSM_PY_MODULES=mod_aws mod_py
 
 CPPFLAGS += -DHAVE_XMLRPCPP_SSL
@@ -49,9 +47,6 @@ override_dh_auto_install:
 		prefix=/usr \
 		cfg_target=/etc/$(APP_NAME)/
 
-	dh_python2
-	dh_python2 /usr/lib/$(APP_NAME)
-
 override_dh_strip:
 	dh_strip --dbgsym-migration='$(APP_NAME)-dbg (<= 1:1.6.0-1+0~mr6.0.0.0)'
 	# MT#7431 those binaries aren't automatically stripped