diff --git a/ci/requirements-2.7.sh b/ci/requirements-2.7.sh
index 64d470e5c6e0e..87daf740e059e 100644
--- a/ci/requirements-2.7.sh
+++ b/ci/requirements-2.7.sh
@@ -4,4 +4,4 @@ source activate pandas
 
 echo "install 27"
 
-conda install -n pandas -c conda-forge feather-format
+conda install -n pandas -c conda-forge feather-format jemalloc=4.4.0
diff --git a/ci/requirements-2.7_BUILD_TEST.sh b/ci/requirements-2.7_BUILD_TEST.sh
index 78941fd0944e5..b90ae3617ba2a 100755
--- a/ci/requirements-2.7_BUILD_TEST.sh
+++ b/ci/requirements-2.7_BUILD_TEST.sh
@@ -4,4 +4,4 @@ source activate pandas
 
 echo "install 27 BUILD_TEST"
 
-conda install -n pandas -c conda-forge pyarrow dask
+conda install -n pandas -c conda-forge pyarrow dask jemalloc=4.4.0
diff --git a/ci/requirements-3.5.sh b/ci/requirements-3.5.sh
index d0f0b81802dc6..a2871f117be96 100644
--- a/ci/requirements-3.5.sh
+++ b/ci/requirements-3.5.sh
@@ -4,4 +4,4 @@ source activate pandas
 
 echo "install 35"
 
-conda install -n pandas -c conda-forge feather-format
+conda install -n pandas -c conda-forge feather-format jemalloc=4.4.0
diff --git a/ci/requirements-3.6.run b/ci/requirements-3.6.run
index 41c9680ce1b7e..06fae9a70ecf7 100644
--- a/ci/requirements-3.6.run
+++ b/ci/requirements-3.6.run
@@ -14,6 +14,7 @@ html5lib
 jinja2
 sqlalchemy
 pymysql
+jemalloc=4.4.0
 feather-format
 # psycopg2 (not avail on defaults ATM)
 beautifulsoup4
diff --git a/ci/requirements-3.6_DOC.sh b/ci/requirements-3.6_DOC.sh
index e43e483d77a73..5a62e75adf7ea 100644
--- a/ci/requirements-3.6_DOC.sh
+++ b/ci/requirements-3.6_DOC.sh
@@ -6,6 +6,6 @@ echo "[install DOC_BUILD deps]"
 
 pip install pandas-gbq
 
-conda install -n pandas -c conda-forge feather-format nbsphinx pandoc
+conda install -n pandas -c conda-forge feather-format nbsphinx pandoc jemalloc=4.4.0
 
 conda install -n pandas -c r r rpy2 --yes