diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 418fd106..c6efbee0 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -7,6 +7,11 @@ Note that ``PHAB_ID=#`` and ``RB_ID=#`` correspond to associated messages in com
 Unreleased
 ----------
 
+Runtime Behavior Changes
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+* Bump version of Jackson to 2.11.4. ``PHAB_ID=D727879``
+
 21.8.0 (No 21.7.0 Release)
 --------------------------
 
diff --git a/build.sbt b/build.sbt
index 60f3b796..b598a261 100644
--- a/build.sbt
+++ b/build.sbt
@@ -6,7 +6,7 @@ Global / excludeLintKeys += scalacOptions
 // All Twitter library releases are date versioned as YY.MM.patch
 val releaseVersion = "21.9.0-SNAPSHOT"
 
-val jacksonVersion = "2.11.2"
+val jacksonVersion = "2.11.4"
 val jacksonLibs = Seq(
   "com.fasterxml.jackson.core" % "jackson-core" % jacksonVersion,
   "com.fasterxml.jackson.core" % "jackson-databind" % jacksonVersion,