diff --git a/.circleci/config.yml b/.circleci/config.yml
index 163818f2b..1ccaa95e0 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -138,13 +138,39 @@ jobs:
       - attach_workspace:
           at: /home/circleci
       - run:
-          name: Run unittests for hitchhiker-tree index
+          name: Run unittests with specs activated
           command: bb test specs
           no_output_timeout: 5m
       - save_cache:
           key: deps-{{ checksum "deps.edn" }}
           paths:
             - /home/circleci/.m2
+  clj-1-10-test:
+    executor: tools/clojurecli
+    steps:
+      - attach_workspace:
+          at: /home/circleci
+      - run:
+          name: Run unittests with clojure 1.10.0
+          command: bb test clj :1.10
+          no_output_timeout: 5m
+      - save_cache:
+          key: deps-{{ checksum "deps.edn" }}
+          paths:
+            - /home/circleci/.m2
+  clj-1-9-test:
+    executor: tools/clojurecli
+    steps:
+      - attach_workspace:
+          at: /home/circleci
+      - run:
+          name: Run unittests with clojure 1.9.0
+          command: bb test clj :1.9
+          no_output_timeout: 5m
+      - save_cache:
+          key: deps-{{ checksum "deps.edn" }}
+          paths:
+            - /home/circleci/.m2
   native-image-test:
     executor: tools/clojurecli
     steps:
@@ -243,6 +269,18 @@ workflows:
           context: dockerhub-deploy
           requires:
             - build
+      - spec-test:
+          context: dockerhub-deploy
+          requires:
+            - build
+      - clj-1-10-test:
+          context: dockerhub-deploy
+          requires:
+            - build
+      - clj-1-9-test:
+          context: dockerhub-deploy
+          requires:
+            - build
       - native-image-test:
           context: dockerhub-deploy
           requires:
@@ -268,6 +306,9 @@ workflows:
             - format
             - persistent-set-test
             - hitchhiker-tree-test
+            - spec-test
+            - clj-1-10-test
+            - clj-1-9-test
             - backward-compatibility-test
             - native-image-test
             - integration-test
diff --git a/bb/src/tools/test.clj b/bb/src/tools/test.clj
index 22a54712b..b3f03c78f 100644
--- a/bb/src/tools/test.clj
+++ b/bb/src/tools/test.clj
@@ -2,15 +2,12 @@
   (:refer-clojure :exclude [test])
   (:require [babashka.fs :as fs]
             [babashka.process :as p]
+            [clojure.string :as str]
             [tools.build :as build]))
 
 (defn clj [opts & args] (apply p/shell opts "clojure" args))
 (defn git [opts & args] (apply p/shell opts "git" args))
 
-(defn kaocha [& args]
-  (apply clj {:extra-env {"TIMBRE_LEVEL" ":warn"}}
-         "-M:test" "-m" "kaocha.runner" args))
-
 (defn back-compat [config]
   (println "Testing backwards compatibility")
   (let [old-version-dir "datahike-old"
@@ -49,12 +46,27 @@
     (p/shell "./bb/resources/native-image-tests/run-native-image-tests")
     (println "Native image cli missing. Please run 'bb ni-cli' and try again.")))
 
+(defn kaocha-with-aliases [aliases & args]
+  (apply clj {:extra-env {"TIMBRE_LEVEL" ":warn"}} 
+         (str "-M:test" (str/join (map #(str ":" (name %)) aliases)))
+         "-m" "kaocha.runner" args))
+
+(defn kaocha [& args]
+  (apply kaocha-with-aliases [] args))
+
 (defn specs []
   (kaocha "--focus" "specs" "--plugin" "kaocha.plugin/orchestra"))
 
+(defn clj-back-compat 
+  "version-alias must be defined in deps.edn"
+  [version-alias & args] 
+  (apply kaocha-with-aliases [version-alias] args))
+
 (defn all [config]
   (kaocha "--skip" "specs")
   (specs)
+  (clj-back-compat :1.10)
+  (clj-back-compat :1.9)
   (back-compat config)
   (native-image))
 
@@ -63,6 +75,7 @@
     (case (first args)
       "native-image" (native-image)
       "back-compat" (back-compat config)
+      "clj" (apply clj-back-compat (rest args))
       "specs" (specs)
       (apply kaocha "--focus" args))
     (all config)))
diff --git a/src/datahike/query_stats.cljc b/src/datahike/query_stats.cljc
index f45734d93..f1ad0de61 100644
--- a/src/datahike/query_stats.cljc
+++ b/src/datahike/query_stats.cljc
@@ -1,4 +1,5 @@
 (ns datahike.query-stats
+  (:refer-clojure :exclude [abs])
   (:require [clojure.set :as set]
             [datahike.tools :as dt]))
 
@@ -7,6 +8,11 @@
      :cljs (let [y (Math/pow 10 precision)]
              (/ (.round js/Math (* y x)) y))))
 
+(defn abs
+  "Only available since Clojure 1.11 and ClojureScript 1.11.10 in core namespaces."
+  [x]
+  (Math/abs x))
+
 (defn get-stats [context]
   {:rels (mapv (fn [rel] {:rows (count (:tuples rel))
                           :bound (set (keys (:attrs rel)))})