diff --git a/deployApi.Dockerfile b/deployApi.Dockerfile
index f5ae9529d..d0b12cb08 100644
--- a/deployApi.Dockerfile
+++ b/deployApi.Dockerfile
@@ -21,6 +21,7 @@ RUN apt-get update \
     ffmpeg \
     ghostscript \
     imagemagick \
+    libjemalloc2 \
     libmagic-dev \
     libmagickwand-dev \
     libmariadb-dev \
@@ -29,7 +30,11 @@ RUN apt-get update \
     docker-ce \
     docker-ce-cli \
     containerd.io \
-  && apt-get clean
+  && apt-get clean \
+  && ln -s /usr/lib/$(uname -m)-linux-gnu/libjemalloc.so.2 /usr/local/lib/libjemalloc.so
+
+# jemalloc stops glibc arena fragmentation from ratcheting up RSS in threaded Puma/Sidekiq
+ENV LD_PRELOAD="/usr/local/lib/libjemalloc.so"
 
 # Setup the folder where we will deploy the code
 WORKDIR /doubtfire
diff --git a/deployAppSvr.Dockerfile b/deployAppSvr.Dockerfile
index 5ef8f1581..e27e75465 100644
--- a/deployAppSvr.Dockerfile
+++ b/deployAppSvr.Dockerfile
@@ -21,6 +21,7 @@ RUN apt-get update \
     ffmpeg \
     ghostscript qpdf \
     imagemagick \
+    libjemalloc2 \
     libmagic-dev \
     libmagickwand-dev \
     libmariadb-dev \
@@ -32,7 +33,11 @@ RUN apt-get update \
     docker-ce \
     docker-ce-cli \
     containerd.io \
-  && apt-get clean
+  && apt-get clean \
+  && ln -s /usr/lib/$(uname -m)-linux-gnu/libjemalloc.so.2 /usr/local/lib/libjemalloc.so
+
+# jemalloc stops glibc arena fragmentation from ratcheting up RSS in threaded Puma/Sidekiq
+ENV LD_PRELOAD="/usr/local/lib/libjemalloc.so"
 
 # Setup the folder where we will deploy the code
 WORKDIR /doubtfire