diff --git a/requirements-build.in b/requirements-build.in
index 3cc9a0f..6343680 100644
--- a/requirements-build.in
+++ b/requirements-build.in
@@ -7,4 +7,4 @@
 babel==2.3.4
 pytz==2016.4              # via babel
 typing==3.7.4.1
-wheel==0.29.0
+wheel==0.38.1
diff --git a/requirements-build.txt b/requirements-build.txt
index 3cc9a0f..b1c284c 100644
--- a/requirements-build.txt
+++ b/requirements-build.txt
@@ -5,6 +5,12 @@
 #    pip-compile requirements-build.in
 #
 babel==2.3.4
-pytz==2016.4              # via babel
+    # via -r requirements-build.in
+pytz==2016.4
+    # via
+    #   -r requirements-build.in
+    #   babel
 typing==3.7.4.1
-wheel==0.29.0
+    # via -r requirements-build.in
+wheel==0.38.1
+    # via -r requirements-build.in