diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5a74b13..e242109 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,10 +24,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - uses: actions/setup-java@v2
+    - uses: actions/setup-java@v3
       with:
-        distribution: 'adopt'
-        java-version: '8'
+        distribution: 'temurin'
+        java-version: '11'
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:
diff --git a/lib/Makefile b/lib/Makefile
index b65d1ff..70a60ee 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -26,19 +26,13 @@ all: \
 # confirmed before moving file into position.  (This practice will
 # probably require frequent updates, unless a signed checksum for the
 # jar can be retrieved somehow.)
-# In case there are concerns on potentially multiple writes to the same
-# file, the documentation for wget's "--output-document file" flag notes
-# that "... file will be truncated immediately, and all downloaded
-# content will be written there."
 rdf-toolkit.jar:
 	test -r rdf-toolkit.jar.sha512
-	# Try retrieval from Github, then from files.caseontology.org.
+	rm -f $@_
+	# Try retrieval from files.caseontology.org.
 	wget \
 	  --output-document $@_ \
-	  https://github.com/trypuz/openfibo/blob/1f9ab415e8ebd131eadcc9b0fc46241adeeb0384/etc/serialization/rdf-toolkit.jar?raw=true \
-	  || wget \
-	    --output-document $@_ \
-	    http://files.caseontology.org/rdf-toolkit.jar
+	  https://files.caseontology.org/rdf-toolkit-1.11.0.jar
 	test \
 	  "x$$(openssl dgst -sha512 $@_ | awk '{print($$NF)}')" \
 	  == \
diff --git a/lib/rdf-toolkit.jar.sha512 b/lib/rdf-toolkit.jar.sha512
index 4c4f5e0..39fbb64 100644
--- a/lib/rdf-toolkit.jar.sha512
+++ b/lib/rdf-toolkit.jar.sha512
@@ -1 +1 @@
-24890b4aa484a46803841fbe5938daf60bf2d0889c0e231102c033d71cb84a2bfa8b44419df3ad896d833609afddd4b3910d2ce28660b3350cca22bea0770dad
+8131e5515da63f099a89a3ce2c7587fb6b228f1ec7c5eb49ff35710509e8511921bfc847e182ee994e575b1f7895c04ae5bed7e1b7826bb32c9475b43b74dc17