diff --git a/build.sbt b/build.sbt
index 0903a0ae..68c38882 100644
--- a/build.sbt
+++ b/build.sbt
@@ -94,7 +94,7 @@ libraryDependencies ++= List(
   "org.http4s"                 %% "http4s-dsl"                % http4s       % Test,
   "org.mockito"                %% "mockito-scala"             % "1.16.37"    % Test,
   "org.scalacheck"             %% "scalacheck"                % "1.15.4"     % Test,
-  "org.scalatest"              %% "scalatest"                 % "3.2.9"      % Test,
+  "org.scalatest"              %% "scalatest"                 % "3.2.15"     % Test,
   "org.scalatestplus"          %% "mockito-1-10"              % "3.1.0.0"    % Test,
   "org.scalatestplus"          %% "scalacheck-1-14"           % "3.2.2.0"    % Test,
   "com.softwaremill.diffx"     %% "diffx-scalatest"           % "0.4.5"      % Test,
diff --git a/examples/sbt/multi-module/build.sbt b/examples/sbt/multi-module/build.sbt
index af8a93be..a3def484 100644
--- a/examples/sbt/multi-module/build.sbt
+++ b/examples/sbt/multi-module/build.sbt
@@ -1,6 +1,6 @@
 lazy val baseSettings = Seq(
   scalaVersion := "2.12.8",
-  libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.9" % "test",
+  libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.15" % "test",
   scapegoatVersion in ThisBuild := "1.3.9"
 )
 
diff --git a/examples/sbt/single-module/build.sbt b/examples/sbt/single-module/build.sbt
index 57119c0b..f4c6e3c9 100644
--- a/examples/sbt/single-module/build.sbt
+++ b/examples/sbt/single-module/build.sbt
@@ -1,4 +1,4 @@
 name := "sbt-single-module"
 scalaVersion := "2.12.8"
-libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.9" % "test"
+libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.15" % "test"
 scapegoatVersion in ThisBuild := "1.3.9"
diff --git a/project/build.sbt b/project/build.sbt
index 3790d27c..acb9239d 100644
--- a/project/build.sbt
+++ b/project/build.sbt
@@ -6,7 +6,7 @@ libraryDependencies ++= Seq(
   "com.sksamuel.scapegoat" % s"scalac-scapegoat-plugin_${scalaVersion.value}" % "1.4.8",
   "com.beautiful-scala"   %% "scalastyle"                                     % "1.5.0",
   "org.scalameta"         %% "scalameta"                                      % "4.4.18",
-  "org.scalatest"         %% "scalatest"                                      % "3.2.9" % Test
+  "org.scalatest"         %% "scalatest"                                      % "3.2.15" % Test
 )
 
 // Adding a resolver to the Artima maven repo, so sbt can download the Artima SuperSafe sbt plugin