diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index a8826ee..cf2f3b3 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -23,10 +23,9 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.8'
-          - '1.9'
-          - '1.10'
-          - 'nightly'
+          - 'lts'
+          - '1'
+          - 'pre'
         os:
           - ubuntu-latest
         arch:
diff --git a/Project.toml b/Project.toml
index b767424..3436408 100644
--- a/Project.toml
+++ b/Project.toml
@@ -6,9 +6,14 @@ version = "0.1.5"
 [deps]
 Conda = "8f4d0f93-b110-5947-807f-2305c1781a2d"
 JSON = "682c06a0-de6a-54ab-a142-c8b1cf79cde6"
-PythonCall = "6099a3de-0909-46bc-b1f4-468b9a2dfc0d"
 Tables = "bd369af6-aec1-5ad0-b16a-f7cc5008161c"
 
+[weakdeps]
+PythonCall = "6099a3de-0909-46bc-b1f4-468b9a2dfc0d"
+
+[extensions]
+AwkwardPythonCallExt = "PythonCall"
+
 [compat]
 Conda = "1.10.0"
 JSON = "0.21.4"
@@ -20,4 +25,4 @@ julia = "1.9"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["Test"]
+test = ["Test", "PythonCall"]
diff --git a/src/AwkwardPythonCallExt.jl b/ext/AwkwardPythonCallExt.jl
similarity index 100%
rename from src/AwkwardPythonCallExt.jl
rename to ext/AwkwardPythonCallExt.jl
diff --git a/src/AwkwardArray.jl b/src/AwkwardArray.jl
index d08dfbf..c22c373 100644
--- a/src/AwkwardArray.jl
+++ b/src/AwkwardArray.jl
@@ -11,9 +11,6 @@ include("./all_implementations.jl")
 include("./tables.jl")
 include("./form_utils.jl")
 
-include("./AwkwardPythonCallExt.jl")
-using .AwkwardPythonCallExt: convert
-
 Base.eltype(::RecordArray{FIELDS,CONTENTS,BEHAVIOR}) where {FIELDS,CONTENTS,BEHAVIOR} = Record{FIELDS,CONTENTS,BEHAVIOR}
 Base.eltype(::Record{FIELDS,CONTENTS,BEHAVIOR}) where {FIELDS,CONTENTS,BEHAVIOR} = CONTENTS
 Base.eltype(::TupleArray{CONTENTS,BEHAVIOR}) where {CONTENTS,BEHAVIOR} = SlotRecord{CONTENTS,BEHAVIOR}