diff --git a/book/games/pong/Cargo.lock b/book/games/pong/Cargo.lock
index 6f006849..789988cd 100644
--- a/book/games/pong/Cargo.lock
+++ b/book/games/pong/Cargo.lock
@@ -386,9 +386,9 @@ checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
 
 [[package]]
 name = "syn"
-version = "1.0.86"
+version = "1.0.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a65b3f4ffa0092e9887669db0eae07941f023991ab58ea44da8fe8e2d511c6b"
+checksum = "1e59d925cf59d8151f25a3bedf97c9c157597c9df7324d32d68991cc399ed08b"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/examples/the-hat-chooses-the-wizard/Cargo.lock b/examples/the-hat-chooses-the-wizard/Cargo.lock
index c0f73bf9..c88ca9a8 100644
--- a/examples/the-hat-chooses-the-wizard/Cargo.lock
+++ b/examples/the-hat-chooses-the-wizard/Cargo.lock
@@ -402,9 +402,9 @@ checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
 
 [[package]]
 name = "syn"
-version = "1.0.86"
+version = "1.0.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a65b3f4ffa0092e9887669db0eae07941f023991ab58ea44da8fe8e2d511c6b"
+checksum = "1e59d925cf59d8151f25a3bedf97c9c157597c9df7324d32d68991cc399ed08b"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/examples/the-purple-night/Cargo.lock b/examples/the-purple-night/Cargo.lock
index b0de5db9..e4945e63 100644
--- a/examples/the-purple-night/Cargo.lock
+++ b/examples/the-purple-night/Cargo.lock
@@ -421,9 +421,9 @@ checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
 
 [[package]]
 name = "syn"
-version = "1.0.86"
+version = "1.0.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a65b3f4ffa0092e9887669db0eae07941f023991ab58ea44da8fe8e2d511c6b"
+checksum = "1e59d925cf59d8151f25a3bedf97c9c157597c9df7324d32d68991cc399ed08b"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/mgba-test-runner/Cargo.lock b/mgba-test-runner/Cargo.lock
index e29ee3ef..41220b70 100644
--- a/mgba-test-runner/Cargo.lock
+++ b/mgba-test-runner/Cargo.lock
@@ -393,9 +393,9 @@ 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",