diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 58adc3348..55c351bf9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,7 +12,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.9'
+          - '1'
         os:
           - ubuntu-latest
         threads:
@@ -20,6 +20,11 @@ jobs:
           - '5'
         arch:
           - x64
+        include:
+          - os: ubuntu-latest
+            arch: x64
+            version: '1.9'
+            threads: 2
     steps:
       - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@v1
@@ -36,6 +41,10 @@ jobs:
             ${{ runner.os }}-test-${{ env.cache-name }}-
             ${{ runner.os }}-test-
             ${{ runner.os }}-
+      - uses: cjdoris/julia-downgrade-compat-action@v1
+        if: ${{ matrix.version == '1.9' }}
+        with:
+          skip: Pkg, InteractiveUtils, Random, LinearAlgebra
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
         env:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6981090a5..7e6f1fc7a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@
 
 # News
 
+## v0.8.19 - 2023-12-16
+
+- Bumping up the lower bounds of many dependencies and adding lower-bound compatibility checks to CI.
+
 ## v0.8.18 - 2023-11-22
 
 - `ECC.faults_matrix` detects and warns when encountery codes with redundant checks.
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
deleted file mode 100644
index a5b29501b..000000000
--- a/CONTRIBUTORS
+++ /dev/null
@@ -1,16 +0,0 @@
-All people who have contributed any change to the
-project, code, or documentation in chronological order.
-
-Stefan Krastanov <quantumclifford@krastanov.org>
-Praveen Viswanathan <pravisswork@gmail.com>
-Grace Sommers <gsommers@princeton.edu>
-Shu Ge <geshu@mit.edu>
-Chen Zhao <zhaochen17@mails.ucas.ac.cn>
-John Lapeyre <john.lapeyre@gmail.com>
-Yuxuan Yan <yyan.tsinghua@gmail.com>
-Maria Gragera Garces <m.gragera.garces@gmail.com>
-Trung Dang <trungdangminh14012004@gmail.com>
-Shayan Pardis <shayanp@mit.edu>
-Adrian Ariton <adrian.ariton0@gmail.com>
-Anthony Micciche <amicciche@umass.edu>
-Abhishek Bhatt <abhishekbhatt730@gmail.com>
diff --git a/Project.toml b/Project.toml
index 1293bad0f..7b860a45d 100644
--- a/Project.toml
+++ b/Project.toml
@@ -38,21 +38,21 @@ QuantumCliffordQuantikzExt = "Quantikz"
 CUDA = "4.4.0"
 Combinatorics = "1.0"
 DataStructures = "0.18"
-DocStringExtensions = "0.8, 0.9"
-Graphs = "1.4.1"
+DocStringExtensions = "0.9"
+Graphs = "1.9"
 HostCPUFeatures = "0.1.6"
 ILog2 = "0.2.3"
 InteractiveUtils = "1"
 LinearAlgebra = "1"
 MacroTools = "0.5.9"
 Makie = "0.19.7"
-Nemo = "0.34, 0.35, 0.36"
+Nemo = "0.38"
 Plots = "1.38.0"
-PrecompileTools = "1"
+PrecompileTools = "1.2"
 Quantikz = "1.3.1"
-QuantumInterface = "0.3.0"
-QuantumOpticsBase = "0.4"
+QuantumInterface = "0.3.3"
+QuantumOpticsBase = "0.4.18"
 Random = "1"
 SIMD = "3.4.0"
-SumTypes = "0.4.4, 0.5"
+SumTypes = "0.5"
 julia = "1.9"
diff --git a/src/randoms.jl b/src/randoms.jl
index 0000896fc..1af3dd392 100644
--- a/src/randoms.jl
+++ b/src/randoms.jl
@@ -168,7 +168,7 @@ end
 
 function nemo_inv(a, n)::Matrix{UInt8}
     binaryring = Nemo.residue_ring(Nemo.ZZ, 2) # TODO should I use GF(2) instead of ResidueRing(ZZ, 2)?
-    M = Nemo.MatrixSpace(binaryring, n, n)
+    M = Nemo.matrix_space(binaryring, n, n)
     inverted = inv(M(Matrix{Int}(a))) # Nemo is very picky about input data types
     return (x->mod(UInt8(x.data),0x2)).(inverted)
 end