diff --git a/Cargo.lock b/Cargo.lock
index 5b4e184a..02067e58 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2259,9 +2259,9 @@ dependencies = [
 
 [[package]]
 name = "regex"
-version = "1.5.4"
+version = "1.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d07a8629359eb56f1e2fb1652bb04212c072a87ba68546a04065d525673ac461"
+checksum = "1a11647b6b25ff05a515cb92c365cec08801e83423a235b51e231e1808747286"
 dependencies = [
  "aho-corasick",
  "memchr",
diff --git a/chapter-51-gear/Cargo.toml b/chapter-51-gear/Cargo.toml
index d127fd1a..2635d6b1 100644
--- a/chapter-51-gear/Cargo.toml
+++ b/chapter-51-gear/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-52-ui/Cargo.toml b/chapter-52-ui/Cargo.toml
index d860e42c..a6eb39ac 100644
--- a/chapter-52-ui/Cargo.toml
+++ b/chapter-52-ui/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-53-woods/Cargo.toml b/chapter-53-woods/Cargo.toml
index a16bfadd..6c317cb4 100644
--- a/chapter-53-woods/Cargo.toml
+++ b/chapter-53-woods/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-54-xp/Cargo.toml b/chapter-54-xp/Cargo.toml
index deb3e892..25f1edce 100644
--- a/chapter-54-xp/Cargo.toml
+++ b/chapter-54-xp/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-55-backtrack/Cargo.toml b/chapter-55-backtrack/Cargo.toml
index c96f4a66..3ae4a5ba 100644
--- a/chapter-55-backtrack/Cargo.toml
+++ b/chapter-55-backtrack/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-56-caverns/Cargo.toml b/chapter-56-caverns/Cargo.toml
index 260bc935..74041ce4 100644
--- a/chapter-56-caverns/Cargo.toml
+++ b/chapter-56-caverns/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-57-ai/Cargo.toml b/chapter-57-ai/Cargo.toml
index 251e18fa..d5ea3c06 100644
--- a/chapter-57-ai/Cargo.toml
+++ b/chapter-57-ai/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-57a-spatial/Cargo.toml b/chapter-57a-spatial/Cargo.toml
index 8b9d5fa6..b95899b1 100644
--- a/chapter-57a-spatial/Cargo.toml
+++ b/chapter-57a-spatial/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-58-itemstats/Cargo.toml b/chapter-58-itemstats/Cargo.toml
index 97abe6b0..da546e0b 100644
--- a/chapter-58-itemstats/Cargo.toml
+++ b/chapter-58-itemstats/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-59-caverns2/Cargo.toml b/chapter-59-caverns2/Cargo.toml
index 724517f3..62477cbf 100644
--- a/chapter-59-caverns2/Cargo.toml
+++ b/chapter-59-caverns2/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-60-caverns3/Cargo.toml b/chapter-60-caverns3/Cargo.toml
index 7a9e26dd..66ee279c 100644
--- a/chapter-60-caverns3/Cargo.toml
+++ b/chapter-60-caverns3/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-61-townportal/Cargo.toml b/chapter-61-townportal/Cargo.toml
index 41c715c7..6b99a5da 100644
--- a/chapter-61-townportal/Cargo.toml
+++ b/chapter-61-townportal/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-62-magicitems/Cargo.toml b/chapter-62-magicitems/Cargo.toml
index a30dc450..1588c662 100644
--- a/chapter-62-magicitems/Cargo.toml
+++ b/chapter-62-magicitems/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-63-effects/Cargo.toml b/chapter-63-effects/Cargo.toml
index 0a48bcf1..fe552852 100644
--- a/chapter-63-effects/Cargo.toml
+++ b/chapter-63-effects/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-64-curses/Cargo.toml b/chapter-64-curses/Cargo.toml
index 21d0b008..f68281e9 100644
--- a/chapter-64-curses/Cargo.toml
+++ b/chapter-64-curses/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-65-items/Cargo.toml b/chapter-65-items/Cargo.toml
index 479fe9d5..fef54a5f 100644
--- a/chapter-65-items/Cargo.toml
+++ b/chapter-65-items/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-66-spells/Cargo.toml b/chapter-66-spells/Cargo.toml
index 3e55bfe4..e4d14a36 100644
--- a/chapter-66-spells/Cargo.toml
+++ b/chapter-66-spells/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-67-dragon/Cargo.toml b/chapter-67-dragon/Cargo.toml
index e25cc509..553ad226 100644
--- a/chapter-67-dragon/Cargo.toml
+++ b/chapter-67-dragon/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-68-mushrooms/Cargo.toml b/chapter-68-mushrooms/Cargo.toml
index de88e000..e3b5af2b 100644
--- a/chapter-68-mushrooms/Cargo.toml
+++ b/chapter-68-mushrooms/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-69-mushrooms2/Cargo.toml b/chapter-69-mushrooms2/Cargo.toml
index b0176f6e..673fc725 100644
--- a/chapter-69-mushrooms2/Cargo.toml
+++ b/chapter-69-mushrooms2/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-70-missiles/Cargo.toml b/chapter-70-missiles/Cargo.toml
index 40dea9be..6f61ed60 100644
--- a/chapter-70-missiles/Cargo.toml
+++ b/chapter-70-missiles/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-71-logging/Cargo.toml b/chapter-71-logging/Cargo.toml
index 0a9d5f24..c0844646 100644
--- a/chapter-71-logging/Cargo.toml
+++ b/chapter-71-logging/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-72-textlayers/Cargo.toml b/chapter-72-textlayers/Cargo.toml
index 309d9c2f..8f785540 100644
--- a/chapter-72-textlayers/Cargo.toml
+++ b/chapter-72-textlayers/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-73-systems/Cargo.toml b/chapter-73-systems/Cargo.toml
index d0aac1e7..a56db5e5 100644
--- a/chapter-73-systems/Cargo.toml
+++ b/chapter-73-systems/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-74-darkcity/Cargo.toml b/chapter-74-darkcity/Cargo.toml
index 43b38b4c..a77cfdcc 100644
--- a/chapter-74-darkcity/Cargo.toml
+++ b/chapter-74-darkcity/Cargo.toml
@@ -13,4 +13,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"
diff --git a/chapter-75-darkplaza/Cargo.toml b/chapter-75-darkplaza/Cargo.toml
index 85249e27..6467e59a 100644
--- a/chapter-75-darkplaza/Cargo.toml
+++ b/chapter-75-darkplaza/Cargo.toml
@@ -12,4 +12,4 @@ specs-derive = "0.4.1"
 serde= { version = "^1.0.44", features = ["derive"] }
 serde_json = "^1.0.44"
 lazy_static = "1.4.0"
-regex = "1.3.6"
+regex = "1.5.5"