diff --git a/org.eclipse.jgit.ant.test/pom.xml b/org.eclipse.jgit.ant.test/pom.xml
index 292d45925..26a33ee43 100644
--- a/org.eclipse.jgit.ant.test/pom.xml
+++ b/org.eclipse.jgit.ant.test/pom.xml
@@ -105,7 +105,7 @@
       <plugin>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
-          <argLine>-Xmx256m -Dfile.encoding=UTF-8 -Djava.io.tmpdir=${project.build.directory}</argLine>
+          <argLine>@{argLine} -Xmx512m -Dfile.encoding=UTF-8 -Djava.io.tmpdir=${project.build.directory}</argLine>
         </configuration>
       </plugin>
     </plugins>
diff --git a/org.eclipse.jgit.http.test/pom.xml b/org.eclipse.jgit.http.test/pom.xml
index 3cbfa36ee..4455f9174 100644
--- a/org.eclipse.jgit.http.test/pom.xml
+++ b/org.eclipse.jgit.http.test/pom.xml
@@ -139,7 +139,7 @@
       <plugin>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
-          <argLine>-Djava.io.tmpdir=${project.build.directory}  -Xmx300m</argLine>
+          <argLine>@{argLine} -Djava.io.tmpdir=${project.build.directory}  -Xmx512m</argLine>
           <includes>
             <include>**/*Test.java</include>
             <include>**/*Tests.java</include>
diff --git a/org.eclipse.jgit.lfs.server.test/BUILD b/org.eclipse.jgit.lfs.server.test/BUILD
index 1341dd601..fb0d6918f 100644
--- a/org.eclipse.jgit.lfs.server.test/BUILD
+++ b/org.eclipse.jgit.lfs.server.test/BUILD
@@ -32,7 +32,7 @@ junit_tests(
         exclude = TEST_BASE,
     ),
     jvm_flags = [
-        "-Xmx256m",
+        "-Xmx512m",
         "-Dfile.encoding=UTF-8",
     ],
     tags = ["lfs-server"],
diff --git a/org.eclipse.jgit.lfs.server.test/pom.xml b/org.eclipse.jgit.lfs.server.test/pom.xml
index 2cbbd021e..2f6b1bd84 100644
--- a/org.eclipse.jgit.lfs.server.test/pom.xml
+++ b/org.eclipse.jgit.lfs.server.test/pom.xml
@@ -137,7 +137,7 @@
       <plugin>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
-          <argLine>-Djava.io.tmpdir=${project.build.directory}  -Xmx300m</argLine>
+          <argLine>@{argLine} -Djava.io.tmpdir=${project.build.directory}  -Xmx512m</argLine>
         </configuration>
       </plugin>
     </plugins>
diff --git a/org.eclipse.jgit.lfs.test/pom.xml b/org.eclipse.jgit.lfs.test/pom.xml
index a7b3acbd6..12daec66f 100644
--- a/org.eclipse.jgit.lfs.test/pom.xml
+++ b/org.eclipse.jgit.lfs.test/pom.xml
@@ -111,7 +111,7 @@
       <plugin>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
-          <argLine>-Djava.io.tmpdir=${project.build.directory}  -Xmx300m</argLine>
+          <argLine>@{argLine} -Djava.io.tmpdir=${project.build.directory}  -Xmx512m</argLine>
         </configuration>
       </plugin>
     </plugins>
diff --git a/org.eclipse.jgit.pgm.test/BUILD b/org.eclipse.jgit.pgm.test/BUILD
index 5bedf9ade..f32fa12de 100644
--- a/org.eclipse.jgit.pgm.test/BUILD
+++ b/org.eclipse.jgit.pgm.test/BUILD
@@ -7,7 +7,7 @@ junit_tests(
     name = "pgm",
     srcs = glob(["tst/**/*.java"]),
     jvm_flags = [
-        "-Xmx256m",
+        "-Xmx512m",
         "-Dfile.encoding=UTF-8",
     ],
     tags = ["pgm"],
diff --git a/org.eclipse.jgit.pgm.test/pom.xml b/org.eclipse.jgit.pgm.test/pom.xml
index e4de18d78..d6b87ae10 100644
--- a/org.eclipse.jgit.pgm.test/pom.xml
+++ b/org.eclipse.jgit.pgm.test/pom.xml
@@ -109,7 +109,7 @@
       <plugin>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
-          <argLine>-Djava.io.tmpdir=${project.build.directory}</argLine>
+          <argLine>@{argLine} -Xmx512m -Djava.io.tmpdir=${project.build.directory}</argLine>
         </configuration>
       </plugin>
     </plugins>
diff --git a/org.eclipse.jgit.test/pom.xml b/org.eclipse.jgit.test/pom.xml
index b8719b972..ca82a9883 100644
--- a/org.eclipse.jgit.test/pom.xml
+++ b/org.eclipse.jgit.test/pom.xml
@@ -157,7 +157,7 @@
       <plugin>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
-          <argLine>-Xmx1024m -Dfile.encoding=UTF-8 -Djava.io.tmpdir=${project.build.directory}</argLine>
+          <argLine>@{argLine} -Xmx768m -Dfile.encoding=UTF-8 -Djava.io.tmpdir=${project.build.directory}</argLine>
           <includes>
             <include>**/*Test.java</include>
             <include>**/*Tests.java</include>