diff --git a/fwdpy11/headers/fwdpp b/fwdpy11/headers/fwdpp
index 960c7af4f..2a3a95175 160000
--- a/fwdpy11/headers/fwdpp
+++ b/fwdpy11/headers/fwdpp
@@ -1 +1 @@
-Subproject commit 960c7af4ff0e27c302178d040e8425153e6db0e5
+Subproject commit 2a3a95175f235cddadaa9028d8bdfdca1c94aac4
diff --git a/rust/fp11rust/Cargo.lock b/rust/fp11rust/Cargo.lock
index 721e06a37..f23cd10cd 100644
--- a/rust/fp11rust/Cargo.lock
+++ b/rust/fp11rust/Cargo.lock
@@ -10,9 +10,9 @@ checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
 [[package]]
 name = "demes"
-version = "0.4.0"
+version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4326ca7f794a2ee4aab90a230a9de5b2af53ffb5265a3131fea5a476242f0d14"
+checksum = "21ac80782d22d8d728988ef57bb72e40e60404c86b6ef42ef6ca99e09242e755"
 dependencies = [
  "regex",
  "serde",
@@ -22,20 +22,19 @@ dependencies = [
 
 [[package]]
 name = "demes-forward"
-version = "0.3.0"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a4490aee7308ba16246e9e42fbc6848d1f2501f66866fc98ed891f57274e5a33"
+checksum = "95b22a06091ef181817da572747886b8c9132a70040cba031144c8fa36f290ab"
 dependencies = [
  "demes",
- "ndarray",
  "thiserror",
 ]
 
 [[package]]
 name = "demes-forward-capi"
-version = "0.4.0"
+version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c011c6a8e05588dad9f0aa2e105a3f282e297e795a96029311ffcd880d14f68d"
+checksum = "fa684e8eb4377a4ef7cb318d8908e644ca99220c67a34cb14d591b2eb9c06aac"
 dependencies = [
  "demes-forward",
  "libc",
@@ -77,56 +76,6 @@ version = "0.2.140"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "99227334921fae1a979cf0bfdfcc6b3e5ce376ef57e16fb6fb3ea2ed6095f80c"
 
-[[package]]
-name = "matrixmultiply"
-version = "0.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "add85d4dd35074e6fedc608f8c8f513a3548619a9024b751949ef0e8e45a4d84"
-dependencies = [
- "rawpointer",
-]
-
-[[package]]
-name = "ndarray"
-version = "0.15.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adb12d4e967ec485a5f71c6311fe28158e9d6f4bc4a447b474184d0f91a8fa32"
-dependencies = [
- "matrixmultiply",
- "num-complex",
- "num-integer",
- "num-traits",
- "rawpointer",
-]
-
-[[package]]
-name = "num-complex"
-version = "0.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "02e0d21255c828d6f128a1e41534206671e8c3ea0c62f32291e808dc82cff17d"
-dependencies = [
- "num-traits",
-]
-
-[[package]]
-name = "num-integer"
-version = "0.1.45"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "225d3389fb3509a24c93f5c29eb6bde2586b98d9f016636dff58d7c6f7569cd9"
-dependencies = [
- "autocfg",
- "num-traits",
-]
-
-[[package]]
-name = "num-traits"
-version = "0.2.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
-dependencies = [
- "autocfg",
-]
-
 [[package]]
 name = "proc-macro2"
 version = "1.0.52"
@@ -145,12 +94,6 @@ dependencies = [
  "proc-macro2",
 ]
 
-[[package]]
-name = "rawpointer"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "60a357793950651c4ed0f3f52338f53b2f809f32d83a07f72909fa13e4c6c1e3"
-
 [[package]]
 name = "regex"
 version = "1.7.1"
diff --git a/tests/demes-spec b/tests/demes-spec
index 44803a99f..402bbbca1 160000
--- a/tests/demes-spec
+++ b/tests/demes-spec
@@ -1 +1 @@
-Subproject commit 44803a99f28209560948acab1a6b4106ec2c0283
+Subproject commit 402bbbca16ba9d0da520ab6b17089dc804708aae