diff --git a/Cargo.lock b/Cargo.lock
index c189d88f..e76bf41a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -6,7 +6,7 @@ dependencies = [
  "byteorder 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "clap 2.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "crc 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "image 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "image 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "libz-sys 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "miniz-sys 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -35,12 +35,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "bitflags"
-version = "0.5.0"
+version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "bitflags"
-version = "0.6.0"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "byteorder"
+version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -103,16 +108,14 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "image"
-version = "0.10.0"
+version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "enum_primitive 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-iter 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-rational 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-traits 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "png 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "png 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -171,8 +174,11 @@ name = "num"
 version = "0.1.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
+ "num-bigint 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-complex 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-integer 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-iter 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-rational 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -187,6 +193,15 @@ dependencies = [
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "num-complex"
+version = "0.1.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "num-traits 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "num-integer"
 version = "0.1.32"
@@ -235,10 +250,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "png"
-version = "0.5.0"
+version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bitflags 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "flate2 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "inflate 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/Cargo.toml b/Cargo.toml
index c0d7942a..52dcf318 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -34,6 +34,6 @@ regex = "^0.1.63"
 scoped-pool = "^0.1.8"
 
 [dev-dependencies.image]
-version = "^0.10.0"
+version = "^0.8.0"
 default-features = false
 features = ["png_codec"]