diff --git a/jenkins-dendron-postgres.sh b/jenkins-dendron-postgres.sh
index 9e3b2df9cf..f715cd559a 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 2f0768fcb7..7a43df0d58 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 da603c5af8..27e61af6ee 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 \