diff --git a/.github/workflows/installcheck.yml b/.github/workflows/installcheck.yml
new file mode 100644
index 0000000..4e03148
--- /dev/null
+++ b/.github/workflows/installcheck.yml
@@ -0,0 +1,54 @@
+name: PostgreSQL Installcheck
+
+on:
+  pull_request:
+    types: [opened, edited, reopened, review_requested]
+
+jobs:
+  installcheck:
+    strategy:
+      matrix:
+        pg_version: [14, 15, 16]
+        os: [ubuntu-latest]
+
+    runs-on: ${{matrix.os}}
+    steps:
+      - name: Add PGDG repo
+        run: >
+          sudo sh -c 'echo "deb https://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list' &&
+          sudo sh -c 'wget -qO - https://www.postgresql.org/media/keys/ACCC4CF8.asc | gpg --dearmor > /etc/apt/trusted.gpg.d/apt.postgresql.org.gpg' &&
+          sudo apt-get update
+
+      - name: Install/modify postgresql-common
+        run: >
+          sudo apt-get install -y --no-install-recommends postgresql-common &&
+          sudo sed -ri 's/#(create_main_cluster) .*$/\1 = false/' /etc/postgresql-common/createcluster.conf
+
+      - name: Install PostgreSQL and server-dev
+        run: >
+          sudo apt-get install -y --no-install-recommends \
+            postgresql-${{matrix.pg_version}} \
+            postgresql-server-dev-${{matrix.pg_version}}
+
+      - name: Install dependencies
+        run: >
+          sudo apt-get install -y --no-install-recommends \
+            postgresql-${{matrix.pg_version}}-partman
+
+      - uses: actions/checkout@v3
+
+      - name: Install extension
+        run: sudo make install
+
+      - name: Start PostgreSQL
+        run: >
+          sudo pg_dropcluster 14 main &&
+          sudo pg_createcluster ${{matrix.pg_version}} main --start -- -A trust
+
+      - name: Test extension
+        id: installcheck
+        run: PGUSER=postgres PGCLUSTER=${{matrix.pg_version}}/main make installcheck
+
+      - name: Display results
+        if: failure() && steps.installcheck.outcome != 'success'
+        run: cat regression.diffs
diff --git a/.github/workflows/trunk_publish.yml b/.github/workflows/trunk_publish.yml
index 27617c9..c596152 100644
--- a/.github/workflows/trunk_publish.yml
+++ b/.github/workflows/trunk_publish.yml
@@ -10,12 +10,12 @@ on:
     branches:
       - main
     paths-ignore:
-      - 'README.md'
+      - "README.md"
   push:
     branches:
       - main
     paths-ignore:
-      - 'README.md'
+      - "README.md"
 
   release:
     types:
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ff3c3eb
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+results/
+
+# ignore latest install file
+timeseries--?.?.?.sql
+!timeseries--?.?.?--?.?.?.sql
diff --git a/Makefile b/Makefile
index fe08fd7..12c7757 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,11 @@ EXTVERSION   = $(shell grep -m 1 '[[:space:]]\{8\}"version":' META.json | \
 DISTVERSION  = $(shell grep -m 1 '[[:space:]]\{3\}"version":' META.json | \
                sed -e 's/[[:space:]]*"version":[[:space:]]*"\([^"]*\)",\{0,1\}/\1/')
 
+EXTVERSIONS = 0.1.0 0.1.1
+
 DATA 		 = $(wildcard sql/*--*.sql)
+DATA_built = $(foreach v,$(EXTVERSIONS),sql/$(EXTENSION)--$(v).sql)
+
 DOCS         = $(wildcard doc/*.md)
 TESTS        = $(wildcard test/sql/*.sql)
 REGRESS      = $(patsubst test/sql/%.sql,%,$(TESTS))
@@ -18,11 +22,15 @@ include $(PGXS)
 
 all: sql/$(EXTENSION)--$(EXTVERSION).sql
 
-sql/$(EXTENSION)--$(EXTVERSION).sql: sql/$(EXTENSION).sql
-	cp $< $@
-
 dist:
 	git archive --format zip --prefix=$(EXTENSION)-$(DISTVERSION)/ -o $(EXTENSION)-$(DISTVERSION).zip HEAD
 
 latest-changes.md: Changes
 	perl -e 'while (<>) {last if /^(v?\Q${DISTVERSION}\E)/; } print "Changes for v${DISTVERSION}:\n"; while (<>) { last if /^\s*$$/; s/^\s+//; print }' Changes > $@
+
+# generate each version's file installation file by concatenating
+# previous upgrade scripts
+sql/$(EXTENSION)--0.1.0.sql: sql/$(EXTENSION).sql
+	cat $^ > $@
+sql/$(EXTENSION)--0.1.1.sql: sql/$(EXTENSION)--0.1.0.sql sql/$(EXTENSION)--0.1.0--0.1.1.sql
+	cat $^ > $@
diff --git a/sql/timeseries--0.1.0--0.1.1.sql b/sql/timeseries--0.1.0--0.1.1.sql
new file mode 100644
index 0000000..9d9e7af
--- /dev/null
+++ b/sql/timeseries--0.1.0--0.1.1.sql
@@ -0,0 +1 @@
+-- empty upgrade, version number only