diff --git a/jenkins-dendron-postgres.sh b/jenkins-dendron-postgres.sh
index 9e3b2df9cfb43179b2098090106a09c6f683313f..f715cd559a7d9d471961c8c26f502f0d1324e821 100755
--- a/jenkins-dendron-postgres.sh
+++ b/jenkins-dendron-postgres.sh
@@ -69,8 +69,8 @@ cd sytest
 
 git checkout "${GIT_BRANCH}" || (echo >&2 "No ref ${GIT_BRANCH} found, falling back to develop" ; git checkout develop)
 
-: ${PORT_BASE:=8000}
-: ${PORT_COUNT=20}
+: ${PORT_BASE:=20000}
+: ${PORT_COUNT=100}
 
 ./jenkins/prep_sytest_for_postgres.sh
 
diff --git a/jenkins-postgres.sh b/jenkins-postgres.sh
index 2f0768fcb7a85a6867b1a60c0b5990e3c4cad395..7a43df0d5872db315e8a8d8d8ab8dcc0365e1328 100755
--- a/jenkins-postgres.sh
+++ b/jenkins-postgres.sh
@@ -43,8 +43,8 @@ cd sytest
 
 git checkout "${GIT_BRANCH}" || (echo >&2 "No ref ${GIT_BRANCH} found, falling back to develop" ; git checkout develop)
 
-: ${PORT_BASE:=8000}
-: ${PORT_COUNT=20}
+: ${PORT_BASE:=20000}
+: ${PORT_COUNT=100}
 
 ./jenkins/prep_sytest_for_postgres.sh
 
diff --git a/jenkins-sqlite.sh b/jenkins-sqlite.sh
index da603c5af8ef6c038d08912ebb51c9748ae671c6..27e61af6eea73ed41378ab05942532221ef91adb 100755
--- a/jenkins-sqlite.sh
+++ b/jenkins-sqlite.sh
@@ -41,8 +41,9 @@ cd sytest
 
 git checkout "${GIT_BRANCH}" || (echo >&2 "No ref ${GIT_BRANCH} found, falling back to develop" ; git checkout develop)
 
-: ${PORT_COUNT=20}
-: ${PORT_BASE:=8000}
+: ${PORT_BASE:=20000}
+: ${PORT_COUNT=100}
+
 ./jenkins/install_and_run.sh --coverage \
                              --python $TOX_BIN/python \
                              --synapse-directory $WORKSPACE \