diff --git a/.circleci/config-2_1.yml b/.circleci/config-2_1.yml
index 54eb3e47eb..8d6656b5bb 100644
--- a/.circleci/config-2_1.yml
+++ b/.circleci/config-2_1.yml
@@ -1021,7 +1021,7 @@ commands:
           cd ~/cassandra
           mkdir ~/dtest_jars
           git remote add apache git://github.com/apache/cassandra.git
-          for branch in cassandra-2.2 cassandra-3.0 cassandra-3.11 trunk; do
+          for branch in cassandra-2.2 cassandra-3.0 cassandra-3.11 cassandra-4.0 trunk; do
             # check out the correct cassandra version:
             git remote set-branches --add apache '$branch'
             git fetch --depth 1 apache $branch
diff --git a/.circleci/config.yml b/.circleci/config.yml
index 17a485564d..12e5daede9 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -3782,7 +3782,7 @@ jobs:
           cd ~/cassandra
           mkdir ~/dtest_jars
           git remote add apache git://github.com/apache/cassandra.git
-          for branch in cassandra-2.2 cassandra-3.0 cassandra-3.11 trunk; do
+          for branch in cassandra-2.2 cassandra-3.0 cassandra-3.11 cassandra-4.0 trunk; do
             # check out the correct cassandra version:
             git remote set-branches --add apache '$branch'
             git fetch --depth 1 apache $branch
diff --git a/.circleci/config.yml.HIGHRES b/.circleci/config.yml.HIGHRES
index cd8b5e0dd9..efaf1e0135 100644
--- a/.circleci/config.yml.HIGHRES
+++ b/.circleci/config.yml.HIGHRES
@@ -3782,7 +3782,7 @@ jobs:
           cd ~/cassandra
           mkdir ~/dtest_jars
           git remote add apache git://github.com/apache/cassandra.git
-          for branch in cassandra-2.2 cassandra-3.0 cassandra-3.11 trunk; do
+          for branch in cassandra-2.2 cassandra-3.0 cassandra-3.11 cassandra-4.0 trunk; do
             # check out the correct cassandra version:
             git remote set-branches --add apache '$branch'
             git fetch --depth 1 apache $branch
diff --git a/.circleci/config.yml.LOWRES b/.circleci/config.yml.LOWRES
index 17a485564d..12e5daede9 100644
--- a/.circleci/config.yml.LOWRES
+++ b/.circleci/config.yml.LOWRES
@@ -3782,7 +3782,7 @@ jobs:
           cd ~/cassandra
           mkdir ~/dtest_jars
           git remote add apache git://github.com/apache/cassandra.git
-          for branch in cassandra-2.2 cassandra-3.0 cassandra-3.11 trunk; do
+          for branch in cassandra-2.2 cassandra-3.0 cassandra-3.11 cassandra-4.0 trunk; do
             # check out the correct cassandra version:
             git remote set-branches --add apache '$branch'
             git fetch --depth 1 apache $branch
diff --git a/.circleci/config.yml.MIDRES b/.circleci/config.yml.MIDRES
index 46ce41dddf..7ec3d1c0a0 100644
--- a/.circleci/config.yml.MIDRES
+++ b/.circleci/config.yml.MIDRES
@@ -3782,7 +3782,7 @@ jobs:
           cd ~/cassandra
           mkdir ~/dtest_jars
           git remote add apache git://github.com/apache/cassandra.git
-          for branch in cassandra-2.2 cassandra-3.0 cassandra-3.11 trunk; do
+          for branch in cassandra-2.2 cassandra-3.0 cassandra-3.11 cassandra-4.0 trunk; do
             # check out the correct cassandra version:
             git remote set-branches --add apache '$branch'
             git fetch --depth 1 apache $branch