diff --git a/12_integrated_testing/Cargo.lock b/12_integrated_testing/Cargo.lock
index 7af740b1..abe5ab82 100644
--- a/12_integrated_testing/Cargo.lock
+++ b/12_integrated_testing/Cargo.lock
@@ -24,9 +24,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.44"
+version = "1.0.47"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7bd7356a8122b6c4a24a82b278680c73357984ca2fc79a0f9fa6dea7dced7c58"
+checksum = "5ea3d908b0e36316caf9e9e2c4625cdde190a7e6f440d794667ed17a1855e725"
 dependencies = [
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 ]
@@ -48,9 +48,9 @@ dependencies = [
 
 [[package]]
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-version = "1.0.101"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e90cde112c4b9690b8cbe810cba9ddd8bc1d7472e2cae317b69e9438c1cba7d2"
+checksum = "a864042229133ada95abf3b54fdc62ef5ccabe9515b64717bcb9a1919e59445d"
 dependencies = [
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@@ -79,6 +79,6 @@ checksum = "696941a0aee7e276a165a978b37918fd5d22c55c3d6bda197813070ca9c0f21c"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.4"
+version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dcc811dc4066ac62f84f11307873c4850cb653bfa9b1719cee2bd2204a4bc5dd"
+checksum = "6ceab39d59e4c9499d4e5a8ee0e2735b891bb7308ac83dfb4e80cad195c9f6f3"
diff --git a/13_exceptions_part2_peripheral_IRQs/Cargo.lock b/13_exceptions_part2_peripheral_IRQs/Cargo.lock
index 59d40ee6..d893a0af 100644
--- a/13_exceptions_part2_peripheral_IRQs/Cargo.lock
+++ b/13_exceptions_part2_peripheral_IRQs/Cargo.lock
@@ -24,9 +24,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.44"
+version = "1.0.47"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7bd7356a8122b6c4a24a82b278680c73357984ca2fc79a0f9fa6dea7dced7c58"
+checksum = "5ea3d908b0e36316caf9e9e2c4625cdde190a7e6f440d794667ed17a1855e725"
 dependencies = [
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@@ -48,9 +48,9 @@ dependencies = [
 
 [[package]]
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-version = "1.0.101"
+version = "1.0.103"
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-checksum = "e90cde112c4b9690b8cbe810cba9ddd8bc1d7472e2cae317b69e9438c1cba7d2"
+checksum = "a864042229133ada95abf3b54fdc62ef5ccabe9515b64717bcb9a1919e59445d"
 dependencies = [
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@@ -79,6 +79,6 @@ checksum = "696941a0aee7e276a165a978b37918fd5d22c55c3d6bda197813070ca9c0f21c"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.4"
+version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dcc811dc4066ac62f84f11307873c4850cb653bfa9b1719cee2bd2204a4bc5dd"
+checksum = "6ceab39d59e4c9499d4e5a8ee0e2735b891bb7308ac83dfb4e80cad195c9f6f3"
diff --git a/14_virtual_mem_part2_mmio_remap/Cargo.lock b/14_virtual_mem_part2_mmio_remap/Cargo.lock
index a66dec99..dd14a9d7 100644
--- a/14_virtual_mem_part2_mmio_remap/Cargo.lock
+++ b/14_virtual_mem_part2_mmio_remap/Cargo.lock
@@ -24,9 +24,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.44"
+version = "1.0.47"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7bd7356a8122b6c4a24a82b278680c73357984ca2fc79a0f9fa6dea7dced7c58"
+checksum = "5ea3d908b0e36316caf9e9e2c4625cdde190a7e6f440d794667ed17a1855e725"
 dependencies = [
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 ]
@@ -48,9 +48,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.101"
+version = "1.0.103"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e90cde112c4b9690b8cbe810cba9ddd8bc1d7472e2cae317b69e9438c1cba7d2"
+checksum = "a864042229133ada95abf3b54fdc62ef5ccabe9515b64717bcb9a1919e59445d"
 dependencies = [
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@@ -79,6 +79,6 @@ checksum = "696941a0aee7e276a165a978b37918fd5d22c55c3d6bda197813070ca9c0f21c"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.4"
+version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dcc811dc4066ac62f84f11307873c4850cb653bfa9b1719cee2bd2204a4bc5dd"
+checksum = "6ceab39d59e4c9499d4e5a8ee0e2735b891bb7308ac83dfb4e80cad195c9f6f3"
diff --git a/15_virtual_mem_part3_precomputed_tables/Cargo.lock b/15_virtual_mem_part3_precomputed_tables/Cargo.lock
index e0c25535..6863764a 100644
--- a/15_virtual_mem_part3_precomputed_tables/Cargo.lock
+++ b/15_virtual_mem_part3_precomputed_tables/Cargo.lock
@@ -24,9 +24,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.44"
+version = "1.0.47"
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-checksum = "7bd7356a8122b6c4a24a82b278680c73357984ca2fc79a0f9fa6dea7dced7c58"
+checksum = "5ea3d908b0e36316caf9e9e2c4625cdde190a7e6f440d794667ed17a1855e725"
 dependencies = [
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 ]
@@ -48,9 +48,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.101"
+version = "1.0.103"
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-checksum = "e90cde112c4b9690b8cbe810cba9ddd8bc1d7472e2cae317b69e9438c1cba7d2"
+checksum = "a864042229133ada95abf3b54fdc62ef5ccabe9515b64717bcb9a1919e59445d"
 dependencies = [
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@@ -79,6 +79,6 @@ checksum = "696941a0aee7e276a165a978b37918fd5d22c55c3d6bda197813070ca9c0f21c"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.4"
+version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dcc811dc4066ac62f84f11307873c4850cb653bfa9b1719cee2bd2204a4bc5dd"
+checksum = "6ceab39d59e4c9499d4e5a8ee0e2735b891bb7308ac83dfb4e80cad195c9f6f3"
diff --git a/16_virtual_mem_part4_higher_half_kernel/Cargo.lock b/16_virtual_mem_part4_higher_half_kernel/Cargo.lock
index 95941be4..1cd1bc74 100644
--- a/16_virtual_mem_part4_higher_half_kernel/Cargo.lock
+++ b/16_virtual_mem_part4_higher_half_kernel/Cargo.lock
@@ -24,9 +24,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.44"
+version = "1.0.47"
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-checksum = "7bd7356a8122b6c4a24a82b278680c73357984ca2fc79a0f9fa6dea7dced7c58"
+checksum = "5ea3d908b0e36316caf9e9e2c4625cdde190a7e6f440d794667ed17a1855e725"
 dependencies = [
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@@ -48,9 +48,9 @@ dependencies = [
 
 [[package]]
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-version = "1.0.101"
+version = "1.0.103"
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-checksum = "e90cde112c4b9690b8cbe810cba9ddd8bc1d7472e2cae317b69e9438c1cba7d2"
+checksum = "a864042229133ada95abf3b54fdc62ef5ccabe9515b64717bcb9a1919e59445d"
 dependencies = [
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@@ -79,6 +79,6 @@ checksum = "696941a0aee7e276a165a978b37918fd5d22c55c3d6bda197813070ca9c0f21c"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.4"
+version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dcc811dc4066ac62f84f11307873c4850cb653bfa9b1719cee2bd2204a4bc5dd"
+checksum = "6ceab39d59e4c9499d4e5a8ee0e2735b891bb7308ac83dfb4e80cad195c9f6f3"
diff --git a/17_kernel_symbols/Cargo.lock b/17_kernel_symbols/Cargo.lock
index 8c84705d..af229efe 100644
--- a/17_kernel_symbols/Cargo.lock
+++ b/17_kernel_symbols/Cargo.lock
@@ -36,9 +36,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.44"
+version = "1.0.47"
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-checksum = "7bd7356a8122b6c4a24a82b278680c73357984ca2fc79a0f9fa6dea7dced7c58"
+checksum = "5ea3d908b0e36316caf9e9e2c4625cdde190a7e6f440d794667ed17a1855e725"
 dependencies = [
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 ]
@@ -60,9 +60,9 @@ dependencies = [
 
 [[package]]
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-version = "1.0.101"
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-checksum = "e90cde112c4b9690b8cbe810cba9ddd8bc1d7472e2cae317b69e9438c1cba7d2"
+checksum = "a864042229133ada95abf3b54fdc62ef5ccabe9515b64717bcb9a1919e59445d"
 dependencies = [
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@@ -91,6 +91,6 @@ checksum = "696941a0aee7e276a165a978b37918fd5d22c55c3d6bda197813070ca9c0f21c"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.4"
+version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dcc811dc4066ac62f84f11307873c4850cb653bfa9b1719cee2bd2204a4bc5dd"
+checksum = "6ceab39d59e4c9499d4e5a8ee0e2735b891bb7308ac83dfb4e80cad195c9f6f3"
diff --git a/18_backtrace/Cargo.lock b/18_backtrace/Cargo.lock
index f662e8a6..2b51ab72 100644
--- a/18_backtrace/Cargo.lock
+++ b/18_backtrace/Cargo.lock
@@ -36,9 +36,9 @@ dependencies = [
 
 [[package]]
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-version = "1.0.44"
+version = "1.0.47"
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-checksum = "7bd7356a8122b6c4a24a82b278680c73357984ca2fc79a0f9fa6dea7dced7c58"
+checksum = "5ea3d908b0e36316caf9e9e2c4625cdde190a7e6f440d794667ed17a1855e725"
 dependencies = [
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@@ -60,9 +60,9 @@ dependencies = [
 
 [[package]]
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-version = "1.0.101"
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-checksum = "e90cde112c4b9690b8cbe810cba9ddd8bc1d7472e2cae317b69e9438c1cba7d2"
+checksum = "a864042229133ada95abf3b54fdc62ef5ccabe9515b64717bcb9a1919e59445d"
 dependencies = [
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@@ -91,6 +91,6 @@ checksum = "696941a0aee7e276a165a978b37918fd5d22c55c3d6bda197813070ca9c0f21c"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.4"
+version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dcc811dc4066ac62f84f11307873c4850cb653bfa9b1719cee2bd2204a4bc5dd"
+checksum = "6ceab39d59e4c9499d4e5a8ee0e2735b891bb7308ac83dfb4e80cad195c9f6f3"
diff --git a/19_kernel_heap/Cargo.lock b/19_kernel_heap/Cargo.lock
index f8d4b6f8..eb80ffea 100644
--- a/19_kernel_heap/Cargo.lock
+++ b/19_kernel_heap/Cargo.lock
@@ -24,9 +24,9 @@ dependencies = [
 
 [[package]]
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-version = "0.10.3"
+version = "0.10.4"
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-checksum = "2e8da0e6283aace40e4e0395fe5ad7a147fac6ff47bda1f038b5044fb11683c2"
+checksum = "e322f259d225fbae43a1b053b2dc6a5968a6bdf8b205f5de684dab485b95030e"
 
 [[package]]
 name = "mingo"
@@ -43,9 +43,9 @@ dependencies = [
 
 [[package]]
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-version = "1.0.44"
+version = "1.0.47"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7bd7356a8122b6c4a24a82b278680c73357984ca2fc79a0f9fa6dea7dced7c58"
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 dependencies = [
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@@ -67,9 +67,9 @@ dependencies = [
 
 [[package]]
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-version = "1.0.101"
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-checksum = "e90cde112c4b9690b8cbe810cba9ddd8bc1d7472e2cae317b69e9438c1cba7d2"
+checksum = "a864042229133ada95abf3b54fdc62ef5ccabe9515b64717bcb9a1919e59445d"
 dependencies = [
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@@ -98,6 +98,6 @@ checksum = "696941a0aee7e276a165a978b37918fd5d22c55c3d6bda197813070ca9c0f21c"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.4"
+version = "1.0.5"
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-checksum = "dcc811dc4066ac62f84f11307873c4850cb653bfa9b1719cee2bd2204a4bc5dd"
+checksum = "6ceab39d59e4c9499d4e5a8ee0e2735b891bb7308ac83dfb4e80cad195c9f6f3"