diff --git a/pkgs/development/interpreters/wasmtime/cargo-lock.patch b/pkgs/development/interpreters/wasmtime/cargo-lock.patch
index 854798865704..95513d4437af 100644
--- a/pkgs/development/interpreters/wasmtime/cargo-lock.patch
+++ b/pkgs/development/interpreters/wasmtime/cargo-lock.patch
@@ -1,17 +1,25 @@
 diff --git a/Cargo.lock b/Cargo.lock
 new file mode 100644
-index 0000000..b961a31
+index 00000000..9cff614a
 --- /dev/null
 +++ b/Cargo.lock
-@@ -0,0 +1,1608 @@
+@@ -0,0 +1,2181 @@
 +# This file is automatically @generated by Cargo.
 +# It is not intended for manual editing.
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++ "const-random 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
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++[[package]]
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++ "num_cpus 1.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
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 +"checksum typemap 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "653be63c80a3296da5551e1bfd2cca35227e13cdd08c6668903ae2f4f77aa1f6"
-+"checksum ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "535c204ee4d8434478593480b8f86ab45ec9aae0e83c568ca81abf0fd0e88f86"
++"checksum typenum 1.11.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6d2783fe2d6b8c1101136184eb41be8b1ad379e4657050b8aaff0c79ee7575f9"
 +"checksum unicode-segmentation 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1967f4cdfc355b37fd76d2a954fb2ed3871034eb4f26d60537d88795cfc332a9"
-+"checksum unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "882386231c45df4700b275c7ff55b6f3698780a650026380e72dabe76fa46526"
++"checksum unicode-width 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "7007dbd421b92cc6e28410fe7362e2e0a2503394908f417b68ec8d1c364c4e20"
 +"checksum unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc"
++"checksum unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "826e7639553986605ec5979c7dd957c7895e93eabed50ab2ffa7f6128a75097c"
++"checksum unindent 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "63f18aa3b0e35fed5a0048f029558b1518095ffe2a0a31fb87c93dece93a4993"
 +"checksum unsafe-any 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f30360d7979f5e9c6e6cea48af192ea8fab4afb3cf72597154b8f08935bc9c7f"
-+"checksum utf8-ranges 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "796f7e48bef87609f7ade7e06495a87d5cd06c7866e6a5cbfceffc558a243737"
 +"checksum vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "05c78687fb1a80548ae3250346c3db86a80a7cdd77bda190189f2d0a0987c81a"
 +"checksum version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "914b1a6776c4c929a602fafd8bc742e06365d4bcbe48c30f9cca5824f70dc9dd"
++"checksum version_check 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)" = "078775d0255232fb988e6fccf26ddc9d1ac274299aaedcedce21c6f72cc533ce"
 +"checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
-+"checksum wabt 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)" = "74e463a508e390cc7447e70f640fbf44ad52e1bd095314ace1fdf99516d32add"
-+"checksum wabt-sys 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)" = "a6265b25719e82598d104b3717375e37661d41753e2c84cde3f51050c7ed7e3c"
-+"checksum wasi-common 0.1.0 (git+https://github.com/CraneStation/wasi-common)" = "<none>"
-+"checksum wasi-common-cbindgen 0.1.0 (git+https://github.com/CraneStation/wasi-common)" = "<none>"
-+"checksum wasmparser 0.29.2 (registry+https://github.com/rust-lang/crates.io-index)" = "981a8797cf89762e0233ec45fae731cb79a4dfaee12d9f0fe6cee01e4ac58d00"
-+"checksum which 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b57acb10231b9493c8472b20cb57317d0679a49e0bdbee44b3b803a6473af164"
-+"checksum winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)" = "f10e386af2b13e47c89e7236a7a14a086791a2b88ebad6df9bf42040195cf770"
++"checksum wabt 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)" = "3c5c5c1286c6e578416982609f47594265f9d489f9b836157d403ad605a46693"
++"checksum wabt-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "af5d153dc96aad7dc13ab90835b892c69867948112d95299e522d370c4e13a08"
++"checksum walrus 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e6f3bd9559eb5b59d55cc60986e26dc9b3f64377d0b9495e41abd9ede9a6443f"
++"checksum walrus-macro 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "0464a6e0d86be4c95c8c838bcb1910df831e1216a9586feeb02478cd52c4e554"
++"checksum wasi 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b89c3ce4ce14bdc6fb6beaf9ec7928ca331de5df7e5ea278375642a2f478570d"
++"checksum wasi-common 0.1.0 (git+https://github.com/CraneStation/wasi-common?rev=c3bf040)" = "<none>"
++"checksum wasi-common-cbindgen 0.1.0 (git+https://github.com/CraneStation/wasi-common?rev=c3bf040)" = "<none>"
++"checksum wasm-webidl-bindings 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e407ee3155cb0742acacd0b21060daafe2ad78ea718f2d6b10e7d9d1032aa961"
++"checksum wasmparser 0.37.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f7387ba67c13dd9cd01d7d961e733375aee889f828564e190da85b5602eb5eeb"
++"checksum wasmparser 0.39.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e5083b449454f7de0b15f131eee17de54b5a71dcb9adcf11df2b2f78fad0cd82"
++"checksum which 3.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "240a31163872f7e8e49f35b42b58485e35355b07eb009d9f3686733541339a69"
++"checksum winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "8093091eeb260906a183e6ae1abdba2ef5ef2257a21801128899c3fc699229c6"
 +"checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 +"checksum winapi-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7168bab6e1daee33b4557efd0e95d5ca70a03706d39fa5f3fe7a236f584b03c9"
 +"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
-+"checksum wincolor 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "561ed901ae465d6185fa7864d63fbd5720d0ef718366c9a4dc83cf6170d7e9ba"
++"checksum wincolor 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "96f5016b18804d24db43cebf3c77269e7569b8954a8464501c216cc5e070eaa9"
++"checksum winx 0.1.0 (git+https://github.com/CraneStation/wasi-common?rev=c3bf040)" = "<none>"
++"checksum zstd 0.4.28+zstd.1.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "f4e716acaad66f2daf2526f37a1321674a8814c0b37a366ebe6c97a699f85ddc"
++"checksum zstd-safe 1.4.13+zstd.1.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "bfe4d3b26a0790201848865663e8ffabf091e126e548bc9710ccfa95621ece48"
++"checksum zstd-sys 1.4.13+zstd.1.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "fadc8ebe858f056ab82dffb9d93850b841603bdf663db7cf5e3dbd7f34cc55b2"
diff --git a/pkgs/development/interpreters/wasmtime/default.nix b/pkgs/development/interpreters/wasmtime/default.nix
index b53b3ed9dbfb..954b7e73b949 100644
--- a/pkgs/development/interpreters/wasmtime/default.nix
+++ b/pkgs/development/interpreters/wasmtime/default.nix
@@ -1,24 +1,24 @@
-{ rustPlatform, fetchFromGitHub, lib, python, cmake, llvmPackages, clang }:
+{ rustPlatform, fetchFromGitHub, lib, python, cmake, llvmPackages, clang, stdenv, darwin }:
 
 rustPlatform.buildRustPackage {
   pname = "wasmtime";
-  version = "20190521";
+  version = "20191018";
 
   src = fetchFromGitHub {
     owner = "CraneStation";
     repo = "wasmtime";
-    rev = "e530a582afe6a2b5735fd7cdf5e2e88391e58669";
-    sha256 = "13lqf9dp1cnw7ms7hcgirmlfkr0v7nrn3p5g7yacfasrqgnwsyl8";
+    rev = "ebef2c6b5720fce164af9ded8b7ff3dd5d7e041c";
+    sha256 = "15wa0by7lb90qd6fg8i2v1hw7hgbkrh1rqhrf7z850c9ydah6n13";
     fetchSubmodules = true;
   };
 
-  cargoSha256 = "1jbpq09czm295316gdv3y0pfapqs0ynj3qbarwlnrv7valq5ak13";
+  cargoSha256 = "07qz6wl32j6gzc9nxv0dr7y6ixmzbzv5j1flkrysdrfidxlldn9k";
 
   cargoPatches = [ ./cargo-lock.patch ];
 
   nativeBuildInputs = [ python cmake clang ];
-  buildInputs = [ llvmPackages.libclang ];
-
+  buildInputs = [ llvmPackages.libclang ] ++
+   lib.optionals stdenv.isDarwin [ darwin.apple_sdk.frameworks.Security ];
   LIBCLANG_PATH = "${llvmPackages.libclang}/lib";
 
   meta = with lib; {