diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a74996e..08f2c8a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -63,7 +63,21 @@ jobs:
           version: ${{ matrix.version }}
       - uses: julia-actions/cache@v1
       - name: "Instantiate test environment"
-        run: julia --project=test devrepl.jl
+        shell: julia --project=test {0}
+        run: |
+          import Pkg
+          println("*** Dev-Installing DocumenterCitations")
+          Pkg.develop(path=pwd())
+          println("*** Pinning minimal dependencies")
+          Pkg.pin([
+              Pkg.PackageSpec(name="AbstractTrees", version="0.4.0"),
+              Pkg.PackageSpec(name="Bibliography", version="0.2.15"),
+              Pkg.PackageSpec(name="Documenter", version="1.0.0"),
+              Pkg.PackageSpec(name="MarkdownAST", version="0.1.2"),
+              Pkg.PackageSpec(name="OrderedCollections", version="1.6.0"),
+          ])
+          Pkg.precompile()
+          Pkg.status()
       - name: "Run tests"
         shell: julia --color=yes --project=test --depwarn="yes" --check-bounds="yes" {0}
         run: |
diff --git a/Project.toml b/Project.toml
index 8d6729c..7175576 100644
--- a/Project.toml
+++ b/Project.toml
@@ -13,9 +13,9 @@ OrderedCollections = "bac558e1-5e72-5ebc-8fee-abe8a469f55d"
 Unicode = "4ec0a83e-493e-50e2-b9ac-8f72acf5a8f5"
 
 [compat]
-AbstractTrees = "^0.4"
-Bibliography = "^0.2"
+AbstractTrees = "0.4"
+Bibliography = "0.2.15"
 Documenter = "1"
 MarkdownAST = "0.1.2"
-OrderedCollections = "1"
-julia = "^1.6"
+OrderedCollections = "1.6"
+julia = "1.6"