diff --git a/pyproject.toml b/pyproject.toml
index f90dfa035..650c3f83a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ classifiers=[
 dynamic = ["version"]
 dependencies=[
     "resdata",
-    "ert>=9.0.0",
+    "ert>=10.2.0b2",
     "importlib_metadata",
     "importlib_resources",
     "numpy",
diff --git a/tests/workflows/ahm_analysis/snapshots/test_ahm_analysis/test_make_update_log_df/update_log.csv b/tests/workflows/ahm_analysis/snapshots/test_ahm_analysis/test_make_update_log_df/update_log.csv
index 1308c3f39..640dc6017 100644
--- a/tests/workflows/ahm_analysis/snapshots/test_ahm_analysis/test_make_update_log_df/update_log.csv
+++ b/tests/workflows/ahm_analysis/snapshots/test_ahm_analysis/test_make_update_log_df/update_log.csv
@@ -1,211 +1,211 @@
 ,obs_key,obs_mean,obs_std,status,sim_mean,sim_std
-0,FOPR,0.0017,0.1,Active,0.0649,0.0912
-1,FOPR,0.0075,0.1,Active,0.0675,0.0927
-2,FOPR,0.0175,0.1,Active,0.0727,0.0949
-3,FOPR,0.0316,0.1,Active,0.0801,0.098
-4,FOPR,0.0496,0.1,Active,0.0904,0.1014
-5,FOPR,0.0715,0.1,Active,0.1028,0.1058
-6,FOPR,0.097,0.1,Active,0.1183,0.1102
-7,FOPR,0.1261,0.1,Active,0.1379,0.1135
-8,FOPR,0.1586,0.1,Active,0.1608,0.1185
-9,FOPR,0.1943,0.1,Active,0.187,0.1247
-10,FOPR,0.2328,0.1,Active,0.2187,0.1297
-11,FOPR,0.274,0.1,Active,0.2531,0.1354
-12,FOPR,0.3177,0.1,Active,0.2943,0.139
-13,FOPR,0.3634,0.1,Active,0.3413,0.1393
-14,FOPR,0.411,0.1,Active,0.3903,0.1395
-15,FOPR,0.46,0.1,Active,0.4411,0.1396
-16,FOPR,0.5103,0.1,Active,0.4931,0.1399
-17,FOPR,0.5614,0.1,Active,0.5459,0.1404
-18,FOPR,0.6134,0.1,Active,0.5995,0.1404
-19,FOPR,0.6655,0.1,Active,0.6536,0.1406
-20,FOPR,0.7179,0.1,Active,0.7079,0.1408
-21,FOPR,0.7704,0.1,Active,0.7617,0.1409
-22,FOPR,0.8227,0.1,Active,0.8146,0.1411
-23,FOPR,0.8746,0.1,Active,0.8665,0.1412
-24,FOPR,0.9262,0.1,Active,0.9172,0.1415
-25,FOPR,0.977,0.1,Active,0.9669,0.1413
-26,FOPR,1.0267,0.1027,Active,1.0139,0.1416
-27,FOPR,1.075,0.1075,Active,1.0579,0.1422
-28,FOPR,1.1216,0.1122,Active,1.0993,0.1429
-29,FOPR,1.1658,0.1166,Active,1.1383,0.1432
-30,FOPR,1.2075,0.1208,Active,1.1741,0.1438
-31,FOPR,1.247,0.1247,Active,1.2068,0.1443
-32,FOPR,1.2835,0.1284,Active,1.2362,0.1446
-33,FOPR,1.3167,0.1317,Active,1.2624,0.1451
-34,FOPR,1.3461,0.1346,Active,1.284,0.1459
-35,FOPR,1.3711,0.1371,Active,1.3023,0.1475
-36,FOPR,1.3916,0.1392,Active,1.3179,0.1509
-37,FOPR,1.4074,0.1407,Active,1.3277,0.1546
-38,FOPR,1.4176,0.1418,Active,1.3327,0.1582
-39,FOPR,1.4222,0.1422,Active,1.3328,0.1604
-40,FOPR,1.4236,0.1424,Active,1.3292,0.1621
-41,FOPR,1.4252,0.1425,Active,1.3241,0.1653
-42,FOPR,1.4273,0.1427,Active,1.3176,0.1668
-43,FOPR,1.43,0.143,Active,1.3099,0.1696
-44,FOPR,1.4334,0.1433,Active,1.3012,0.1698
-45,FOPR,1.4377,0.1438,Active,1.289,0.169
-46,FOPR,1.4429,0.1443,Active,1.2754,0.1689
-47,FOPR,1.4489,0.1449,Active,1.2602,0.1672
-48,FOPR,1.4548,0.1455,Active,1.2456,0.167
-49,FOPR,1.4603,0.146,Active,1.2309,0.1665
-50,FOPR,1.4656,0.1466,Active,1.2145,0.1675
-51,FOPR,1.4704,0.147,Active,1.1953,0.1656
-52,FOPR,1.4742,0.1474,Active,1.1737,0.1634
-53,FOPR,1.4753,0.1475,Active,1.1515,0.163
-54,FOPR,1.4738,0.1474,Active,1.1294,0.1662
-55,FOPR,1.4694,0.1469,Active,1.1103,0.1709
-56,FOPR,1.4612,0.1461,Active,1.0907,0.1758
-57,FOPR,1.4495,0.1449,Active,1.0707,0.1826
-58,FOPR,1.4364,0.1436,Active,1.049,0.185
-59,FOPR,1.4214,0.1421,Active,1.0258,0.1881
-60,FOPR,1.4027,0.1403,Active,0.9986,0.1898
-61,FOPR,1.3793,0.1379,Active,0.976,0.1888
-62,FOPR,1.3527,0.1353,Active,0.9499,0.1903
-63,FOPR,1.3241,0.1324,Active,0.9261,0.1937
-64,FOPR,1.2966,0.1297,Active,0.9011,0.197
-65,FOPR,1.2705,0.127,Active,0.8773,0.1988
-66,FOPR,1.2434,0.1243,Active,0.8552,0.1988
-67,FOPR,1.216,0.1216,Active,0.835,0.1979
-68,FOPR,1.1891,0.1189,Active,0.8165,0.1984
-69,FOPR,1.1615,0.1161,Active,0.7949,0.1966
-70,FOPR,1.1344,0.1134,Active,0.7724,0.1952
-71,FOPR,1.1116,0.1112,Active,0.7495,0.1942
-72,FOPR,1.0911,0.1091,Active,0.7256,0.1942
-73,FOPR,1.0719,0.1072,Active,0.7031,0.195
-74,FOPR,1.0527,0.1053,Active,0.6777,0.1951
-75,FOPR,1.0326,0.1033,Active,0.6513,0.1968
-76,FOPR,1.0129,0.1013,Active,0.6226,0.2007
-77,FOPR,0.9946,0.1,Active,0.5976,0.2039
-78,FOPR,0.9755,0.1,Active,0.5714,0.2081
-79,FOPR,0.9557,0.1,Active,0.5499,0.2095
-80,FOPR,0.9363,0.1,Active,0.5285,0.2088
-81,FOPR,0.9158,0.1,Active,0.5092,0.2081
-82,FOPR,0.8928,0.1,Active,0.4917,0.2084
-83,FOPR,0.8687,0.1,Active,0.4751,0.2088
-84,FOPR,0.8423,0.1,Active,0.4587,0.2104
-85,FOPR,0.8125,0.1,Active,0.4425,0.2128
-86,FOPR,0.7789,0.1,Active,0.4275,0.215
-87,FOPR,0.7419,0.1,Active,0.4149,0.2178
-88,FOPR,0.7025,0.1,Active,0.4036,0.2204
-89,FOPR,0.6613,0.1,Active,0.3949,0.2225
-90,FOPR,0.6194,0.1,Active,0.3881,0.2268
-91,FOPR,0.5782,0.1,Active,0.3825,0.2332
-92,FOPR,0.5397,0.1,Active,0.3771,0.239
-93,FOPR,0.5051,0.1,Active,0.3739,0.2464
-94,FOPR,0.4749,0.1,Active,0.3705,0.2508
-95,FOPR,0.4502,0.1,Active,0.3674,0.2523
-96,FOPR,0.4314,0.1,Active,0.3684,0.2547
-97,FOPR,0.4186,0.1,Active,0.3707,0.2556
-98,FOPR,0.41,0.1,Active,0.3694,0.2551
-99,FOPR,0.4057,0.1,Active,0.3709,0.255
-100,FOPR,0.4042,0.1,Active,0.3695,0.2525
-101,FOPR,0.3992,0.1,Active,0.3685,0.2462
-102,FOPR,0.3887,0.1,Active,0.3684,0.2384
-103,FOPR,0.3742,0.1,Active,0.3686,0.2303
-104,FOPR,0.3552,0.1,Active,0.3689,0.2232
-105,FOPR,0.3317,0.1,Active,0.3679,0.2162
-106,FOPR,0.3062,0.1,Active,0.3653,0.2076
-107,FOPR,0.2815,0.1,Active,0.3616,0.1987
-108,FOPR,0.2637,0.1,Active,0.3568,0.1903
-109,FOPR,0.2481,0.1,Active,0.3521,0.1841
-110,FOPR,0.2333,0.1,Active,0.3505,0.1777
-111,FOPR,0.2185,0.1,Active,0.3512,0.1714
-112,FOPR,0.2047,0.1,Active,0.3482,0.1705
-113,FOPR,0.192,0.1,Active,0.3461,0.1692
-114,FOPR,0.1798,0.1,Active,0.3457,0.1671
-115,FOPR,0.1688,0.1,Active,0.3447,0.1661
-116,FOPR,0.1595,0.1,Active,0.3416,0.1665
-117,FOPR,0.1517,0.1,Active,0.3371,0.1672
-118,FOPR,0.1457,0.1,Active,0.3316,0.1685
-119,FOPR,0.1411,0.1,Active,0.3244,0.168
-120,FOPR,0.1373,0.1,Active,0.317,0.1654
-121,FOPR,0.1337,0.1,Active,0.3094,0.1633
-122,FOPR,0.1302,0.1,Active,0.3038,0.1602
-123,FOPR,0.1265,0.1,Active,0.2981,0.1577
-124,FOPR,0.1228,0.1,Active,0.2941,0.1562
-125,FOPR,0.1193,0.1,Active,0.2918,0.1546
-126,FOPR,0.1199,0.1,Active,0.2889,0.1527
-127,FOPR,0.1281,0.1,Active,0.2856,0.1495
-128,FOPR,0.136,0.1,Active,0.2824,0.1437
-129,FOPR,0.1434,0.1,Active,0.2768,0.1379
-130,FOPR,0.1499,0.1,Active,0.2735,0.1342
-131,FOPR,0.1549,0.1,Active,0.2722,0.1324
-132,FOPR,0.1591,0.1,Active,0.2695,0.1322
-133,FOPR,0.1627,0.1,Active,0.2671,0.1337
-134,FOPR,0.1656,0.1,Active,0.2642,0.1338
-135,FOPR,0.167,0.1,Active,0.2632,0.1316
-136,FOPR,0.1672,0.1,Active,0.2625,0.1305
-137,FOPR,0.1661,0.1,Active,0.2614,0.1296
-138,FOPR,0.165,0.1,Active,0.2609,0.1285
-139,FOPR,0.1643,0.1,Active,0.2602,0.1279
-140,FOPR,0.1651,0.1,Active,0.2595,0.1276
-141,FOPR,0.169,0.1,Active,0.2566,0.1262
-142,FOPR,0.1759,0.1,Active,0.2532,0.1238
-143,FOPR,0.1857,0.1,Active,0.2489,0.1216
-144,FOPR,0.1974,0.1,Active,0.2426,0.1188
-145,FOPR,0.2106,0.1,Active,0.2359,0.1156
-146,FOPR,0.2248,0.1,Active,0.2287,0.112
-147,FOPR,0.2392,0.1,Active,0.2242,0.1097
-148,FOPR,0.2524,0.1,Active,0.2191,0.1063
-149,FOPR,0.2641,0.1,Active,0.2132,0.1034
-150,FOPR,0.2747,0.1,Active,0.2094,0.1011
-151,FOPR,0.2849,0.1,Active,0.2059,0.0992
-152,FOPR,0.2945,0.1,Active,0.2032,0.0978
-153,FOPR,0.3028,0.1,Active,0.1993,0.0988
-154,FOPR,0.3088,0.1,Active,0.1971,0.0989
-155,FOPR,0.312,0.1,Active,0.1936,0.0999
-156,FOPR,0.3125,0.1,Active,0.1905,0.0999
-157,FOPR,0.3097,0.1,Active,0.1869,0.0983
-158,FOPR,0.3039,0.1,Active,0.1835,0.0971
-159,FOPR,0.2956,0.1,Active,0.1795,0.096
-160,FOPR,0.2859,0.1,Active,0.1752,0.0948
-161,FOPR,0.2754,0.1,Active,0.171,0.0938
-162,FOPR,0.2642,0.1,Active,0.1663,0.0925
-163,FOPR,0.2527,0.1,Active,0.1612,0.0913
-164,FOPR,0.2412,0.1,Active,0.156,0.0902
-165,FOPR,0.2295,0.1,Active,0.1509,0.0897
-166,FOPR,0.2178,0.1,Active,0.146,0.0894
-167,FOPR,0.2069,0.1,Active,0.141,0.0893
-168,FOPR,0.1965,0.1,Active,0.1359,0.0892
-169,FOPR,0.1869,0.1,Active,0.1308,0.0892
-170,FOPR,0.1776,0.1,Active,0.1258,0.0892
-171,FOPR,0.1683,0.1,Active,0.1212,0.089
-172,FOPR,0.1588,0.1,Active,0.117,0.0887
-173,FOPR,0.1496,0.1,Active,0.1129,0.0881
-174,FOPR,0.1412,0.1,Active,0.1093,0.0878
-175,FOPR,0.1335,0.1,Active,0.1057,0.0875
-176,FOPR,0.1266,0.1,Active,0.1024,0.0874
-177,FOPR,0.1205,0.1,Active,0.0994,0.0874
-178,FOPR,0.1153,0.1,Active,0.0966,0.0873
-179,FOPR,0.1109,0.1,Active,0.0938,0.0869
-180,FOPR,0.1065,0.1,Active,0.091,0.0865
-181,FOPR,0.1015,0.1,Active,0.088,0.0865
-182,FOPR,0.0956,0.1,Active,0.0849,0.0868
-183,FOPR,0.0888,0.1,Active,0.082,0.0874
-184,FOPR,0.0812,0.1,Active,0.0792,0.0881
-185,FOPR,0.0734,0.1,Active,0.0768,0.0888
-186,FOPR,0.0655,0.1,Active,0.0751,0.0895
-187,FOPR,0.0577,0.1,Active,0.0736,0.0902
-188,FOPR,0.0503,0.1,Active,0.0723,0.0909
-189,FOPR,0.0438,0.1,Active,0.0714,0.0916
-190,FOPR,0.0379,0.1,Active,0.0709,0.0922
-191,FOPR,0.0329,0.1,Active,0.0707,0.0929
-192,FOPR,0.029,0.1,Active,0.0706,0.0933
-193,FOPR,0.026,0.1,Active,0.0709,0.0937
-194,FOPR,0.0238,0.1,Active,0.071,0.094
-195,FOPR,0.0222,0.1,Active,0.0713,0.0942
-196,FOPR,0.021,0.1,Active,0.0715,0.0943
-197,FOPR,0.0203,0.1,Active,0.0716,0.0944
-198,FOPR,0.0198,0.1,Active,0.0717,0.0945
-199,FOPR,0.0196,0.1,Active,0.0718,0.0945
-200,WOPR_OP1_108,0.3,0.075,Active,0.1868,0.1205
-201,WOPR_OP1_144,0.2,0.035,Active,0.1262,0.0977
-202,WOPR_OP1_190,0.015,0.01,Active,0.0243,0.0346
-203,WOPR_OP1_36,0.7,0.07,Active,0.6561,0.0681
-204,WOPR_OP1_72,0.5,0.05,Active,0.3852,0.1431
-205,WOPR_OP1_9,0.1,0.05,Active,0.0777,0.0508
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-207,WPR_DIFF_1,0.1,0.2,Active,0.0172,0.143
-208,WPR_DIFF_1,0.2,0.15,Active,0.049,0.1755
-209,WPR_DIFF_1,0.0,0.05,Active,0.0451,0.1667
+0,WPR_DIFF_1,0.0,0.1,Active,-0.0318,0.0713
+1,WPR_DIFF_1,0.1,0.2,Active,0.0172,0.143
+2,WPR_DIFF_1,0.2,0.15,Active,0.049,0.1755
+3,WPR_DIFF_1,0.0,0.05,Active,0.0451,0.1667
+4,FOPR,0.0017,0.1,Active,0.0649,0.0912
+5,FOPR,0.0075,0.1,Active,0.0675,0.0927
+6,FOPR,0.0175,0.1,Active,0.0727,0.0949
+7,FOPR,0.0316,0.1,Active,0.0801,0.098
+8,FOPR,0.0496,0.1,Active,0.0904,0.1014
+9,FOPR,0.0715,0.1,Active,0.1028,0.1058
+10,FOPR,0.097,0.1,Active,0.1183,0.1102
+11,FOPR,0.1261,0.1,Active,0.1379,0.1135
+12,FOPR,0.1586,0.1,Active,0.1608,0.1185
+13,FOPR,0.1943,0.1,Active,0.187,0.1247
+14,FOPR,0.2328,0.1,Active,0.2187,0.1297
+15,FOPR,0.274,0.1,Active,0.2531,0.1354
+16,FOPR,0.3177,0.1,Active,0.2943,0.139
+17,FOPR,0.3634,0.1,Active,0.3413,0.1393
+18,FOPR,0.411,0.1,Active,0.3903,0.1395
+19,FOPR,0.46,0.1,Active,0.4411,0.1396
+20,FOPR,0.5103,0.1,Active,0.4931,0.1399
+21,FOPR,0.5614,0.1,Active,0.5459,0.1404
+22,FOPR,0.6134,0.1,Active,0.5995,0.1404
+23,FOPR,0.6655,0.1,Active,0.6536,0.1406
+24,FOPR,0.7179,0.1,Active,0.7079,0.1408
+25,FOPR,0.7704,0.1,Active,0.7617,0.1409
+26,FOPR,0.8227,0.1,Active,0.8146,0.1411
+27,FOPR,0.8746,0.1,Active,0.8665,0.1412
+28,FOPR,0.9262,0.1,Active,0.9172,0.1415
+29,FOPR,0.977,0.1,Active,0.9669,0.1413
+30,FOPR,1.0267,0.1027,Active,1.0139,0.1416
+31,FOPR,1.075,0.1075,Active,1.0579,0.1422
+32,FOPR,1.1216,0.1122,Active,1.0993,0.1429
+33,FOPR,1.1658,0.1166,Active,1.1383,0.1432
+34,FOPR,1.2075,0.1208,Active,1.1741,0.1438
+35,FOPR,1.247,0.1247,Active,1.2068,0.1443
+36,FOPR,1.2835,0.1284,Active,1.2362,0.1446
+37,FOPR,1.3167,0.1317,Active,1.2624,0.1451
+38,FOPR,1.3461,0.1346,Active,1.284,0.1459
+39,FOPR,1.3711,0.1371,Active,1.3023,0.1475
+40,FOPR,1.3916,0.1392,Active,1.3179,0.1509
+41,FOPR,1.4074,0.1407,Active,1.3277,0.1546
+42,FOPR,1.4176,0.1418,Active,1.3327,0.1582
+43,FOPR,1.4222,0.1422,Active,1.3328,0.1604
+44,FOPR,1.4236,0.1424,Active,1.3292,0.1621
+45,FOPR,1.4252,0.1425,Active,1.3241,0.1653
+46,FOPR,1.4273,0.1427,Active,1.3176,0.1668
+47,FOPR,1.43,0.143,Active,1.3099,0.1696
+48,FOPR,1.4334,0.1433,Active,1.3012,0.1698
+49,FOPR,1.4377,0.1438,Active,1.289,0.169
+50,FOPR,1.4429,0.1443,Active,1.2754,0.1689
+51,FOPR,1.4489,0.1449,Active,1.2602,0.1672
+52,FOPR,1.4548,0.1455,Active,1.2456,0.167
+53,FOPR,1.4603,0.146,Active,1.2309,0.1665
+54,FOPR,1.4656,0.1466,Active,1.2145,0.1675
+55,FOPR,1.4704,0.147,Active,1.1953,0.1656
+56,FOPR,1.4742,0.1474,Active,1.1737,0.1634
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+58,FOPR,1.4738,0.1474,Active,1.1294,0.1662
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diff --git a/tests/workflows/ahm_analysis/test_ahm_analysis.py b/tests/workflows/ahm_analysis/test_ahm_analysis.py
index 819862db2..6830840dc 100644
--- a/tests/workflows/ahm_analysis/test_ahm_analysis.py
+++ b/tests/workflows/ahm_analysis/test_ahm_analysis.py
@@ -29,7 +29,7 @@ def test_make_update_log_df(snake_oil_facade, snapshot):
             snake_oil_facade,
             prior_ens,
             posterior_ens,
-            sorted(list(prior_ens.experiment.observations.keys())),
+            sorted(list(prior_ens.experiment.observation_keys)),
             sorted(list(prior_ens.experiment.parameter_configuration.keys())),
         )
     snapshot.assert_match(