diff --git a/Cargo.lock b/Cargo.lock
index 5ea53f8..a29e0bd 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -81,7 +81,7 @@ dependencies = [
  "num-traits 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "ordered-float 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "permutohedron 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "petgraph 0.4.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "petgraph 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "primal 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "primal-check 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "primal-estimate 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -196,11 +196,6 @@ dependencies = [
  "num-traits 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "fixedbitset"
-version = "0.1.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "fixedbitset"
 version = "0.2.0"
@@ -536,11 +531,6 @@ dependencies = [
  "num-traits 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "ordermap"
-version = "0.3.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "paste"
 version = "0.1.6"
@@ -568,11 +558,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "petgraph"
-version = "0.4.13"
+version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "fixedbitset 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "ordermap 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fixedbitset 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "indexmap 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1063,7 +1053,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum derive_more 0.99.2 (registry+https://github.com/rust-lang/crates.io-index)" = "2159be042979966de68315bce7034bb000c775f22e3e834e1c52ff78f041cae8"
 "checksum either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "bb1f6b1ce1c140482ea30ddd3335fc0024ac7ee112895426e0a629a6c20adfe3"
 "checksum euclid 0.20.7 (registry+https://github.com/rust-lang/crates.io-index)" = "3f852d320142e1cceb15dccef32ed72a9970b83109d8a4e24b1ab04d579f485d"
-"checksum fixedbitset 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)" = "86d4de0081402f5e88cdac65c8dcdcc73118c1a7a465e2a05f0da05843a8ea33"
 "checksum fixedbitset 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "37ab347416e802de484e4d03c7316c48f1ecb56574dfd4a46a80f173ce1de04d"
 "checksum fs_extra 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5f2a4a2034423744d2cc7ca2068453168dcdb82c438419e639a26bd87839c674"
 "checksum fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "a06f77d526c1a601b7c4cdd98f54b5eaabffc14d5f2f0296febdc7f357c6d3ba"
@@ -1104,11 +1093,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum num-rational 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f2885278d5fe2adc2f75ced642d52d879bffaceb5a2e0b1d4309ffdfb239b454"
 "checksum num-traits 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)" = "d4c81ffc11c212fa327657cb19dd85eb7419e163b5b076bede2bdb5c974c07e4"
 "checksum ordered-float 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "18869315e81473c951eb56ad5558bbc56978562d3ecfb87abb7a1e944cea4518"
-"checksum ordermap 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "a86ed3f5f244b372d6b1a00b72ef7f8876d0bc6a78a4c9985c53614041512063"
 "checksum paste 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "423a519e1c6e828f1e73b720f9d9ed2fa643dce8a7737fb43235ce0b41eeaa49"
 "checksum paste-impl 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "4214c9e912ef61bf42b81ba9a47e8aad1b2ffaf739ab162bf96d1e011f54e6c5"
 "checksum permutohedron 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "b687ff7b5da449d39e418ad391e5e08da53ec334903ddbb921db208908fc372c"
-"checksum petgraph 0.4.13 (registry+https://github.com/rust-lang/crates.io-index)" = "9c3659d1ee90221741f65dd128d9998311b0e40c5d3c23a62445938214abce4f"
+"checksum petgraph 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "29c127eea4a29ec6c85d153c59dc1213f33ec74cead30fe4730aecc88cc1fd92"
 "checksum ppv-lite86 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "74490b50b9fbe561ac330df47c08f3f33073d2d00c150f719147d7c54522fa1b"
 "checksum primal 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "0e31b86efadeaeb1235452171a66689682783149a6249ff334a2c5d8218d00a4"
 "checksum primal-bit 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "686a64e2f50194c64942992af5799e6b6e8775b8f88c607d72ed0a2fd58b9b21"
diff --git a/Cargo.toml b/Cargo.toml
index a4b13d4..22a1f87 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -55,7 +55,7 @@ rand_pcg = "=0.2.1"
 rand_distr = "=0.2.2"
 
 # グラフ
-petgraph = "=0.4.13"
+petgraph = "=0.5.0"
 
 # 幾何
 euclid = "=0.20.7"