diff --git a/externals/buildsys/common b/externals/buildsys/common
index 93661c2..22fccb0 160000
--- a/externals/buildsys/common
+++ b/externals/buildsys/common
@@ -1 +1 @@
-Subproject commit 93661c2a86011d0221a720cb47460ff714642f9d
+Subproject commit 22fccb0e700af5a54b02c45d6bf49fae8d90ea57
diff --git a/mapproxy/debian/zesty/control b/mapproxy/debian/focal/control
similarity index 65%
rename from mapproxy/debian/zesty/control
rename to mapproxy/debian/focal/control
index 92a5467..b4f42f9 100644
--- a/mapproxy/debian/zesty/control
+++ b/mapproxy/debian/focal/control
@@ -2,14 +2,14 @@ m4_dnl ###############################################################
 m4_dnl ## Build dependencies
 m4_dnl ###############################################################
 m4_dnl
-m4_define({{{VAR_BuildDepends}}},{{{debhelper (>= 9.20160115ubuntu3), libboost1.62-all-dev
-    , libopencv-core-dev (>= 2.4.9)
-    , libopencv-highgui-dev (>= 2.4.9)
-    , libopencv-photo-dev (>= 2.4.9)
-    , libopencv-imgproc-dev (>= 2.4.9)
+m4_define({{{VAR_BuildDepends}}},{{{debhelper (>= 9.20160115ubuntu3), libboost1.71-all-dev
+    , libopencv-core-dev (>= 4.2)
+    , libopencv-highgui-dev (>= 4.2)
+    , libopencv-photo-dev (>= 4.2)
+    , libopencv-imgproc-dev (>= 4.2)
     , libeigen3-dev (>= 3.1.0-1)
-    , libgdal-dev (>= 2.1), libproj-dev (>= 4.9)
-    , libopenmesh-dev (>= 6.3)
+    , libgdal-dev (>= 3.0), libproj-dev (>= 6.0)
+    , libopenmesh-dev (>= 8.0)
     , libgeographic-dev (>= 1.45-2)
     , libjsoncpp-dev (>= 1.7.2-1)
     , libprotobuf-dev (>= 2.6.1)