diff --git a/Projects/AnalysisBase/externals.txt b/Projects/AnalysisBase/externals.txt
index ab21329a182e0fd83c003949c89104a2026faee0..5c03f13f11b1f1fdc6f9e8486b26ab257c26578b 100644
--- a/Projects/AnalysisBase/externals.txt
+++ b/Projects/AnalysisBase/externals.txt
@@ -6,4 +6,4 @@
 # forbidden.
 
 # The version of atlas/atlasexternals to use:
-AnalysisBaseExternalsVersion = 2.1.26
+AnalysisBaseExternalsVersion = 2.1.27
diff --git a/Projects/AthAnalysis/externals.txt b/Projects/AthAnalysis/externals.txt
index 2fac882e89e41376c2a4f2567da79e8202f17d60..1c104849d3755b031cd907d74eaa2e145ace29b0 100644
--- a/Projects/AthAnalysis/externals.txt
+++ b/Projects/AthAnalysis/externals.txt
@@ -6,4 +6,4 @@
 # forbidden.
 
 # The version of atlas/atlasexternals to use:
-AthAnalysisExternalsVersion = 2.1.26
+AthAnalysisExternalsVersion = 2.1.27
diff --git a/Projects/AthGeneration/externals.txt b/Projects/AthGeneration/externals.txt
index c7e1c6c01e19507e4e8bfd235c340b6a31927d23..11871d918cd7a75e5693d2769891aba605e65e2d 100644
--- a/Projects/AthGeneration/externals.txt
+++ b/Projects/AthGeneration/externals.txt
@@ -6,4 +6,4 @@
 # forbidden.
 
 # The version of atlas/atlasexternals to use:
-AthGenerationExternalsVersion = 2.1.26
+AthGenerationExternalsVersion = 2.1.27
diff --git a/Projects/AthSimulation/externals.txt b/Projects/AthSimulation/externals.txt
index 943140c34681fd0bd4cb653439bc2bf53bc9ae4a..381a015213f96e63380b4990b0d03921ecf4e4ed 100644
--- a/Projects/AthSimulation/externals.txt
+++ b/Projects/AthSimulation/externals.txt
@@ -6,4 +6,4 @@
 # forbidden.
 
 # The version of atlas/atlasexternals to use:
-AthSimulationExternalsVersion = 2.1.26
+AthSimulationExternalsVersion = 2.1.27
diff --git a/Projects/Athena/externals.txt b/Projects/Athena/externals.txt
index fb92995bbb86ed0b49a3286cfa4ecf2a86885957..17d05c49084b1f094e278cbea4eff9ebb77dea11 100644
--- a/Projects/Athena/externals.txt
+++ b/Projects/Athena/externals.txt
@@ -6,4 +6,4 @@
 # forbidden.
 
 # The version of atlas/atlasexternals to use:
-AthenaExternalsVersion = 2.1.26
+AthenaExternalsVersion = 2.1.27
diff --git a/Projects/DetCommon/externals.txt b/Projects/DetCommon/externals.txt
index 387d2a1906066692be0b40d6190cc19b207b37f9..56efa47d886df877f066df6a0229e6b4a46f8272 100644
--- a/Projects/DetCommon/externals.txt
+++ b/Projects/DetCommon/externals.txt
@@ -6,4 +6,4 @@
 # forbidden.
 
 # The version of atlas/atlasexternals to use:
-AtlasExternalsVersion = 2.1.26
+AtlasExternalsVersion = 2.1.27
diff --git a/Projects/VP1Light/externals.txt b/Projects/VP1Light/externals.txt
index d5939a9c86db0305f38d629378ccf1e0d5c0f024..a33f4949f7be722ddbf24f9bf6a0e7f7ab7ed68c 100644
--- a/Projects/VP1Light/externals.txt
+++ b/Projects/VP1Light/externals.txt
@@ -6,4 +6,4 @@
 # forbidden.
 
 # The version of atlas/atlasexternals to use:
-VP1LightExternalsVersion = 2.1.26
+VP1LightExternalsVersion = 2.1.27