diff --git a/.kokoro/samples/python3.10/presubmit.cfg b/.kokoro/samples/python3.10/presubmit.cfg
index a1c8d97..ddc0ae4 100644
--- a/.kokoro/samples/python3.10/presubmit.cfg
+++ b/.kokoro/samples/python3.10/presubmit.cfg
@@ -2,5 +2,5 @@
 
 env_vars: {
     key: "INSTALL_LIBRARY_FROM_SOURCE"
-    value: "True"
+    value: "FALSE"
 }
\ No newline at end of file
diff --git a/.kokoro/samples/python3.11/presubmit.cfg b/.kokoro/samples/python3.11/presubmit.cfg
index a1c8d97..50fec96 100644
--- a/.kokoro/samples/python3.11/presubmit.cfg
+++ b/.kokoro/samples/python3.11/presubmit.cfg
@@ -2,5 +2,5 @@
 
 env_vars: {
     key: "INSTALL_LIBRARY_FROM_SOURCE"
-    value: "True"
+    value: "False"
 }
\ No newline at end of file
diff --git a/.kokoro/samples/python3.12/presubmit.cfg b/.kokoro/samples/python3.12/presubmit.cfg
index a1c8d97..50fec96 100644
--- a/.kokoro/samples/python3.12/presubmit.cfg
+++ b/.kokoro/samples/python3.12/presubmit.cfg
@@ -2,5 +2,5 @@
 
 env_vars: {
     key: "INSTALL_LIBRARY_FROM_SOURCE"
-    value: "True"
+    value: "False"
 }
\ No newline at end of file
diff --git a/.kokoro/samples/python3.7/presubmit.cfg b/.kokoro/samples/python3.7/presubmit.cfg
index a1c8d97..50fec96 100644
--- a/.kokoro/samples/python3.7/presubmit.cfg
+++ b/.kokoro/samples/python3.7/presubmit.cfg
@@ -2,5 +2,5 @@
 
 env_vars: {
     key: "INSTALL_LIBRARY_FROM_SOURCE"
-    value: "True"
+    value: "False"
 }
\ No newline at end of file
diff --git a/.kokoro/samples/python3.8/presubmit.cfg b/.kokoro/samples/python3.8/presubmit.cfg
index a1c8d97..50fec96 100644
--- a/.kokoro/samples/python3.8/presubmit.cfg
+++ b/.kokoro/samples/python3.8/presubmit.cfg
@@ -2,5 +2,5 @@
 
 env_vars: {
     key: "INSTALL_LIBRARY_FROM_SOURCE"
-    value: "True"
+    value: "False"
 }
\ No newline at end of file
diff --git a/.kokoro/samples/python3.9/presubmit.cfg b/.kokoro/samples/python3.9/presubmit.cfg
index a1c8d97..50fec96 100644
--- a/.kokoro/samples/python3.9/presubmit.cfg
+++ b/.kokoro/samples/python3.9/presubmit.cfg
@@ -2,5 +2,5 @@
 
 env_vars: {
     key: "INSTALL_LIBRARY_FROM_SOURCE"
-    value: "True"
+    value: "False"
 }
\ No newline at end of file