diff -Naur a/crypto/rand/prov_seed.c b/crypto/rand/prov_seed.c
--- a/crypto/rand/prov_seed.c	2024-06-04 19:00:52.000000000 +0600
+++ b/crypto/rand/prov_seed.c	2024-09-12 19:23:19.499111977 +0600
@@ -23,7 +23,14 @@
     size_t entropy_available;
     RAND_POOL *pool;
 
-    pool = ossl_rand_pool_new(entropy, 1, min_len, max_len);
+    /*
+     * OpenSSL still implements an internal entropy pool of
+     * some size that is hashed to get seed data.
+     * Note that this is a conditioning step for which SP800-90C requires
+     * 64 additional bits from the entropy source to claim the requested
+     * amount of entropy.
+     */
+    pool = ossl_rand_pool_new(entropy + 64, 1, min_len, max_len);
     if (pool == NULL) {
         ERR_raise(ERR_LIB_RAND, ERR_R_RAND_LIB);
         return 0;
diff -Naur a/providers/implementations/rands/crngt.c b/providers/implementations/rands/crngt.c
--- a/providers/implementations/rands/crngt.c	2024-06-04 19:00:52.000000000 +0600
+++ b/providers/implementations/rands/crngt.c	2024-09-12 19:24:11.196772793 +0600
@@ -133,7 +133,11 @@
      * to the nearest byte.  If the entropy is of less than full quality,
      * the amount required should be scaled up appropriately here.
      */
-    bytes_needed = (entropy + 7) / 8;
+    /*
+     * FIPS 140-3: the yet draft SP800-90C requires requested entropy
+     * + 128 bits during initial seeding
+     */
+    bytes_needed = (entropy + 128 + 7) / 8;
     if (bytes_needed < min_len)
         bytes_needed = min_len;
     if (bytes_needed > max_len)
diff -Naur a/providers/implementations/rands/drbg.c b/providers/implementations/rands/drbg.c
--- a/providers/implementations/rands/drbg.c	2024-06-04 19:00:52.000000000 +0600
+++ b/providers/implementations/rands/drbg.c	2024-09-12 19:22:24.292474182 +0600
@@ -563,7 +563,9 @@
         adinlen = 0;
 #endif
     }
-
+#ifdef FIPS_MODULE
+    prediction_resistance = 1;
+#endif
     /* Reseed using our sources in addition */
     entropylen = get_entropy(drbg, &entropy, drbg->strength,
                              drbg->min_entropylen, drbg->max_entropylen,