diff --git a/.travis.yml b/.travis.yml
index 85a0ee623..9d696a9d9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: python
 python:
   - 2.7
-  - 3.5
+  - 3.6.10
 before_install:
   # Print NumPy version that is already installed by Travis CI:
   - python -c "import numpy; print(numpy.__version__)"
diff --git a/amrclaw b/amrclaw
index b7a68bf0e..8bc203390 160000
--- a/amrclaw
+++ b/amrclaw
@@ -1 +1 @@
-Subproject commit b7a68bf0e8bbcf57142c722126e9698a6a6ea2a0
+Subproject commit 8bc2033908e86821160a8b4834023e0fa075ad3f
diff --git a/classic b/classic
index 5546fec0e..0452fa40e 160000
--- a/classic
+++ b/classic
@@ -1 +1 @@
-Subproject commit 5546fec0eaf205bba50178ac24d86a0f8eaa462c
+Subproject commit 0452fa40ec59b7cb2d761ee5b9a1ebe85af5e9de
diff --git a/clawutil b/clawutil
index e040eeb95..86210b7ff 160000
--- a/clawutil
+++ b/clawutil
@@ -1 +1 @@
-Subproject commit e040eeb95f161f1e9232f7897335986ca1db1179
+Subproject commit 86210b7ff3e12ba94006d0d364dec345d50b9101
diff --git a/geoclaw b/geoclaw
index 8ff1c6fd4..e11c29197 160000
--- a/geoclaw
+++ b/geoclaw
@@ -1 +1 @@
-Subproject commit 8ff1c6fd47b4075e9cda4e8479e212769781644f
+Subproject commit e11c29197a7efe98e668a74d1f8899b9f2955781
diff --git a/pyclaw b/pyclaw
index 83f3fe42c..ba8aa6142 160000
--- a/pyclaw
+++ b/pyclaw
@@ -1 +1 @@
-Subproject commit 83f3fe42cc4ca340d2718edae4dde9690ee151be
+Subproject commit ba8aa6142fc03f110535c844902434f75292fe48
diff --git a/visclaw b/visclaw
index 8c584074d..fffe01c19 160000
--- a/visclaw
+++ b/visclaw
@@ -1 +1 @@
-Subproject commit 8c584074d12ef4f3449e748eb0035bd6bb72c14a
+Subproject commit fffe01c19b76460d9b69a08f42510ce2131a170c