diff --git a/.buildkite/pipeline.yml b/.buildkite/pipeline.yml
index ef4a60a93f..285f9194ef 100644
--- a/.buildkite/pipeline.yml
+++ b/.buildkite/pipeline.yml
@@ -9,6 +9,7 @@ steps:
               version: "{{matrix.julia}}"
           - JuliaCI/julia-test#v1:
               test_args: "--quickfail"
+              allow_reresolve: false
           - JuliaCI/julia-coverage#v1:
               dirs:
                 - src
@@ -19,6 +20,13 @@ steps:
           cuda: "*"
         commands: |
           echo -e "[CUDA_Runtime_jll]\nlocal = \"true\"" >LocalPreferences.toml
+
+          # for non-nightly, use Resolver.jl to install the oldest package versions
+          if [[ "{{ matrix.julia }}" != "nightly" ]]; then
+            git clone https://github.com/StefanKarpinski/Resolver.jl /tmp/Resolver
+            julia -e 'using Pkg; Pkg.activate("/tmp/Resolver/bin"); Pkg.instantiate()'
+            julia /tmp/Resolver/bin/resolve.jl . --min=@alldeps --julia="{{matrix.julia}}"
+          fi
         if: |
           build.message =~ /\[only tests\]/ ||
           build.message =~ /\[only julia\]/ ||
diff --git a/Project.toml b/Project.toml
index 9d79b96d62..c105505f44 100644
--- a/Project.toml
+++ b/Project.toml
@@ -51,9 +51,9 @@ SparseMatricesCSRExt = "SparseMatricesCSR"
 SpecialFunctionsExt = "SpecialFunctions"
 
 [compat]
-AbstractFFTs = "0.4, 0.5, 1.0"
+AbstractFFTs = "0.5, 1.0"
 Adapt = "4"
-BFloat16s = "0.2, 0.3, 0.4, 0.5"
+BFloat16s = "0.4, 0.5"
 CEnum = "0.2, 0.3, 0.4, 0.5"
 CUDA_Compiler_jll = "0.2"
 CUDA_Driver_jll = "13"
@@ -65,7 +65,7 @@ DataFrames = "1"
 EnzymeCore = "0.8.2"
 ExprTools = "0.1"
 GPUArrays = "11.2.1"
-GPUCompiler = "0.24, 0.25, 0.26, 0.27, 1"
+GPUCompiler = "0.27, 1"
 GPUToolbox = "0.3"
 KernelAbstractions = "0.9.38"
 LLVM = "9.1"
@@ -81,12 +81,12 @@ Printf = "1"
 Random = "1"
 Random123 = "1.2"
 RandomNumbers = "1.5.3"
-Reexport = "0.2, 1.0"
-Requires = "0.5, 1.0"
+Reexport = "1.0"
+Requires = "1.0"
 SparseArrays = "1"
 SparseMatricesCSR = "0.6.9"
 SpecialFunctions = "1.3, 2"
-StaticArrays = "1"
+StaticArrays = "1.6"
 Statistics = "1"
 demumble_jll = "1.3"
 julia = "1.10"