diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index f2080b385..2c9af90cd 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -16,7 +16,8 @@ jobs:
     strategy:
       matrix:
         version:
-          - '1.6'
+          - '1.9'
+          - '1.10'
           - '1'
         os:
           - ubuntu-20.04 # required for libhdf5 v1.10.4 support
@@ -50,9 +51,9 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.6'
+          - '1.9'
+          - '1.10'
           - '1'
-          - '1.11-nightly'
           - 'nightly'
         os:
           - ubuntu-latest
@@ -66,14 +67,8 @@ jobs:
             arch: x86
           - os: ubuntu-latest # excluded because HDF5_jll v1.12 does not support i686
             arch: x86
-          - version: '1.6'
-            arch: x86
           - version: 'nightly'
             arch: x86
-          - version: '1.6'
-            os: macOS-latest
-          - version: '1.6'
-            os: windows-latest
     steps:
       - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@latest
@@ -123,7 +118,14 @@ jobs:
             using Pkg
             try
               # force it to use this PR's version of the package
-              Pkg.develop(PackageSpec(path="."))  # resolver may fail with main deps
+              Pkg.develop(PackageSpec[ # resolver may fail with main deps
+                PackageSpec(path="."),
+                PackageSpec(path="./filters/H5Zbitshuffle"),
+                PackageSpec(path="./filters/H5Zblosc"),
+                PackageSpec(path="./filters/H5Zbzip2"),
+                PackageSpec(path="./filters/H5Zlz4"),
+                PackageSpec(path="./filters/H5Zzstd"),
+              ])
               Pkg.update()
               Pkg.test()  # resolver may fail with test time deps
             catch err
diff --git a/Project.toml b/Project.toml
index 12d492b93..47061c388 100644
--- a/Project.toml
+++ b/Project.toml
@@ -26,7 +26,7 @@ MPIPreferences = "0.1.7"
 Preferences = "1.3"
 Requires = "1.0"
 bitshuffle_jll = "0.4.2, 0.5"
-julia = "1.6"
+julia = "1.9"
 
 [extensions]
 BloscExt = "Blosc"
diff --git a/ext/BloscExt/BloscExt.jl b/ext/BloscExt/BloscExt.jl
index 3401904bb..451315f92 100644
--- a/ext/BloscExt/BloscExt.jl
+++ b/ext/BloscExt/BloscExt.jl
@@ -13,6 +13,8 @@ import HDF5.Filters:
     set_local_func,
     set_local_cfunc
 import HDF5.Filters.Shuffle
+import HDF5: Properties
+import HDF5: set_blosc!
 
 export H5Z_FILTER_BLOSC, blosc_filter, BloscFilter
 
@@ -216,6 +218,11 @@ function Base.push!(f::FilterPipeline, blosc::BloscFilter)
     return f
 end
 
+# legacy support
+set_blosc!(p::Properties, val::Bool) = val && push!(FilterPipeline(p), BloscFilter())
+set_blosc!(p::Properties, level::Integer) =
+    push!(FilterPipeline(p), BloscFilter(; level=level))
+
 function __init__()
     register_filter(BloscFilter)
 end
diff --git a/src/HDF5.jl b/src/HDF5.jl
index 977b01ab8..fd791afb0 100644
--- a/src/HDF5.jl
+++ b/src/HDF5.jl
@@ -129,13 +129,6 @@ function __init__()
         )
     end
 
-    @require H5Zblosc = "c8ec2601-a99c-407f-b158-e79c03c2f5f7" begin
-        set_blosc!(p::Properties, val::Bool) =
-            val && push!(Filters.FilterPipeline(p), H5Zblosc.BloscFilter())
-        set_blosc!(p::Properties, level::Integer) =
-            push!(Filters.FilterPipeline(p), H5Zblosc.BloscFilter(; level=level))
-    end
-
     return nothing
 end
 
diff --git a/src/properties.jl b/src/properties.jl
index a52075bb2..b68b7e8a8 100644
--- a/src/properties.jl
+++ b/src/properties.jl
@@ -451,7 +451,7 @@ Properties used when creating a new `Dataset`. Inherits from
 The following options are shortcuts for the various filters, and are set-only.
 They will be appended to the filter pipeline in the order in which they appear
 
-- `blosc = true | level`: set the [`H5Zblosc.BloscFilter`](@ref) compression
+- `blosc = true | level`: set the [`BloscExt.BloscFilter`](@ref) compression
   filter; argument can be either `true`, or the compression level.
 
 - `deflate = true | level`: set the [`Filters.Deflate`](@ref) compression