diff --git a/.github/trigger_files/beam_PostCommit_Python_Xlang_Gcp_Dataflow.json b/.github/trigger_files/beam_PostCommit_Python_Xlang_Gcp_Dataflow.json
index 83346d34aee0..c5309eebb070 100644
--- a/.github/trigger_files/beam_PostCommit_Python_Xlang_Gcp_Dataflow.json
+++ b/.github/trigger_files/beam_PostCommit_Python_Xlang_Gcp_Dataflow.json
@@ -1,4 +1,4 @@
 {
   "comment": "Modify this file in a trivial way to cause this test suite to run",
-  "modification": 16
+  "modification": 17
 }
diff --git a/.github/trigger_files/beam_PostCommit_Python_Xlang_IO_Dataflow.json b/.github/trigger_files/beam_PostCommit_Python_Xlang_IO_Dataflow.json
index e3d6056a5de9..b26833333238 100644
--- a/.github/trigger_files/beam_PostCommit_Python_Xlang_IO_Dataflow.json
+++ b/.github/trigger_files/beam_PostCommit_Python_Xlang_IO_Dataflow.json
@@ -1,4 +1,4 @@
 {
   "comment": "Modify this file in a trivial way to cause this test suite to run",
-  "modification": 1
+  "modification": 2
 }
diff --git a/buildSrc/src/main/groovy/org/apache/beam/gradle/BeamModulePlugin.groovy b/buildSrc/src/main/groovy/org/apache/beam/gradle/BeamModulePlugin.groovy
index 0db2d1b27ab3..c9b911747eac 100644
--- a/buildSrc/src/main/groovy/org/apache/beam/gradle/BeamModulePlugin.groovy
+++ b/buildSrc/src/main/groovy/org/apache/beam/gradle/BeamModulePlugin.groovy
@@ -3142,6 +3142,8 @@ class BeamModulePlugin implements Plugin<Project> {
             installTargets = "${distTarBall}[${packages},${extra}]"
           }
           project.exec {
+            // Per-project uv cache avoids sdist lock contention in parallel installGcpTest.
+            environment 'UV_CACHE_DIR', project.file("${project.ext.envdir}/.uv-cache").absolutePath
             executable 'sh'
             args '-c', ". ${project.ext.envdir}/bin/activate && pip install uv && uv pip install --pre ${installTargets}"
           }