diff --git a/.gitignore b/.gitignore
index 5cd77ea..7c8042a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@
 /cbindgen-0.6.1.crate
 /cbindgen-0.6.3.crate
 /cbindgen-0.6.4.crate
+/cbindgen-0.6.6.crate
diff --git a/cbindgen-test-release.patch b/cbindgen-test-release.patch
new file mode 100644
index 0000000..11d41cd
--- /dev/null
+++ b/cbindgen-test-release.patch
@@ -0,0 +1,18 @@
+--- cbindgen-0.6.6/test.py.orig	2018-05-31 09:03:09.000000000 -0700
++++ cbindgen-0.6.6/test.py	2018-10-22 15:21:50.222301880 -0700
+@@ -8,13 +8,13 @@ import filecmp
+ 
+ def build_cbindgen():
+     try:
+-        subprocess.check_output(["cargo", "build"])
++        subprocess.check_output(["cargo", "build", "--release"])
+         return True
+     except subprocess.CalledProcessError:
+         return False
+ 
+ def cbindgen(path, out, c, style, verify):
+-    bin = ["target/debug/cbindgen"]
++    bin = ["target/release/cbindgen"]
+     compile = [path, "-o", out]
+     flags = []
+ 
diff --git a/rust-cbindgen.spec b/rust-cbindgen.spec
index e6238c8..8462e56 100644
--- a/rust-cbindgen.spec
+++ b/rust-cbindgen.spec
@@ -4,7 +4,7 @@
 %global crate cbindgen
 
 Name:           rust-%{crate}
-Version:        0.6.4
+Version:        0.6.6
 Release:        1%{?dist}
 Summary:        Tool for generating C bindings to Rust code
 
@@ -13,6 +13,9 @@ License:        MPLv2.0
 URL:            https://crates.io/crates/cbindgen
 Source0:        https://crates.io/api/v1/crates/%{crate}/%{version}/download#/%{crate}-%{version}.crate
 
+# Run tests with the release binaries
+Patch1:         cbindgen-test-release.patch
+
 ExclusiveArch:  %{rust_arches}
 
 BuildRequires:  rust-packaging
@@ -25,6 +28,11 @@ BuildRequires:  (crate(serde_json) >= 1.0.0 with crate(serde_json) < 2.0.0)
 BuildRequires:  ((crate(syn) >= 0.14.0 with crate(syn) < 0.15.0) with crate(syn/clone-impls) with crate(syn/derive) with crate(syn/extra-traits) with crate(syn/full) with crate(syn/parsing) with crate(syn/printing))
 BuildRequires:  (crate(tempfile) >= 3.0.0 with crate(tempfile) < 4.0.0)
 BuildRequires:  (crate(toml) >= 0.4.0 with crate(toml) < 0.5.0)
+BuildRequires:  /usr/bin/pathfix.py
+%if %{with check}
+BuildRequires:  python3
+BuildRequires:  gcc-c++
+%endif
 
 %description
 %{summary}.
@@ -48,6 +56,7 @@ which use %{crate} from crates.io.
 %prep
 %autosetup -n %{crate}-%{version} -p1
 %cargo_prep
+pathfix.py -pni "%{__python3} %{py3_shbang_opts}" test.py
 
 %build
 %cargo_build
@@ -58,6 +67,7 @@ which use %{crate} from crates.io.
 %if %{with check}
 %check
 %cargo_test
+./test.py -v
 %endif
 
 %files       -n %{crate}
@@ -71,6 +81,9 @@ which use %{crate} from crates.io.
 %{cargo_registry}/%{crate}-%{version}/
 
 %changelog
+* Mon Oct 22 2018 Josh Stone <jistone@redhat.com> - 0.6.6-1
+- Update to 0.6.6
+
 * Thu Oct 04 2018 Josh Stone <jistone@redhat.com> - 0.6.4-1
 - Update to 0.6.4
 
diff --git a/sources b/sources
index 67f4ddf..145834e 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (cbindgen-0.6.4.crate) = 652fbf20b0a33d8b5414f2aaca815f813795c7d1da16636c1437603f51b08fac9e289b0367d79274c8318966ba069fb68cdd15b4b7345b1034f9ab440c6b3a8e
+SHA512 (cbindgen-0.6.6.crate) = d51d17765d705424dead65e4240c52fe93da731d5ac1cc76fe79e2eb68a42c26a7de58b08149cccd6806ee5bb189df8c15c3a532a5f857a65c2fd69c656d7137