diff --git a/packages/gapic-generator/requirements.txt b/packages/gapic-generator/requirements.txt
index 38eb25a0b012..876bbe52bf97 100644
--- a/packages/gapic-generator/requirements.txt
+++ b/packages/gapic-generator/requirements.txt
@@ -1230,9 +1230,9 @@ pyasn1-modules==0.4.2 \
     --hash=sha256:29253a9207ce32b64c3ac6600edc75368f98473906e8fd1043bd6b5b1de2c14a \
     --hash=sha256:677091de870a80aae844b1ca6134f54652fa2c8c5a52aa396440ac3106e941e6
     # via google-auth
-pycparser==3.0 \
-    --hash=sha256:600f49d217304a5902ac3c37e1281c9fe94e4d0489de643a9504c5cdfdfc6b29 \
-    --hash=sha256:b727414169a36b7d524c1c3e31839a521725078d7b2ff038656844266160a992
+pycparser==3.11 \
+    --hash=sha256:51d5a8ba2be0bbe440b99d2112604c95bbbc3c2748a64260186c541e1729cd80 \
+    --hash=sha256:d875f09c3507d00e1aba0eecc6dcadc1352f30fff09dc6bff2f1c2935e97c2bc
     # via cffi
 pygments==2.21.0 \
     --hash=sha256:2363c69b61c4a97c838da3b130dcd6468f4848992b21a82f2a63ec34377137d9 \
diff --git a/packages/google-cloud-bigquery/samples/geography/requirements.txt b/packages/google-cloud-bigquery/samples/geography/requirements.txt
index 1b076fde310d..6e76fad045cc 100644
--- a/packages/google-cloud-bigquery/samples/geography/requirements.txt
+++ b/packages/google-cloud-bigquery/samples/geography/requirements.txt
@@ -27,7 +27,7 @@ proto-plus==1.26.1
 pyarrow==23.0.1
 pyasn1==0.6.4
 pyasn1-modules==0.4.2
-pycparser==2.23
+pycparser==3.11
 pyparsing==3.2.5
 python-dateutil==2.9.0.post0
 pytz==2026.5
diff --git a/packages/sqlalchemy-spanner/requirements.txt b/packages/sqlalchemy-spanner/requirements.txt
index a2ae28b9c688..57a7fbddfc49 100644
--- a/packages/sqlalchemy-spanner/requirements.txt
+++ b/packages/sqlalchemy-spanner/requirements.txt
@@ -744,9 +744,9 @@ pyasn1-modules==0.4.2 \
     --hash=sha256:29253a9207ce32b64c3ac6600edc75368f98473906e8fd1043bd6b5b1de2c14a \
     --hash=sha256:677091de870a80aae844b1ca6134f54652fa2c8c5a52aa396440ac3106e941e6
     # via google-auth
-pycparser==3.0 \
-    --hash=sha256:600f49d217304a5902ac3c37e1281c9fe94e4d0489de643a9504c5cdfdfc6b29 \
-    --hash=sha256:b727414169a36b7d524c1c3e31839a521725078d7b2ff038656844266160a992
+pycparser==3.11 \
+    --hash=sha256:51d5a8ba2be0bbe440b99d2112604c95bbbc3c2748a64260186c541e1729cd80 \
+    --hash=sha256:d875f09c3507d00e1aba0eecc6dcadc1352f30fff09dc6bff2f1c2935e97c2bc
     # via cffi
 pyparsing==3.3.2 \
     --hash=sha256:850ba148bd908d7e2411587e247a1e4f0327839c40e2e5e6d05a007ecc69911d \